1143 lines
20 KiB
HTML
1143 lines
20 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Set Up The Bridge</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.63
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"><LINK
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REL="HOME"
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TITLE="Linux BRIDGE-STP-HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Preparing The Bridge"
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HREF="preparing-the-bridge.html"><LINK
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REL="NEXT"
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TITLE="Advanced Bridge Features"
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HREF="advanced-bridge.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Linux BRIDGE-STP-HOWTO: About The Linux Modular Bridge And STP</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="preparing-the-bridge.html"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="advanced-bridge.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="SET-UP-THE-BRIDGE"
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>6. Set Up The Bridge</A
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></H1
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><P
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>Make sure all your network cards are working nicely
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and are accessible.
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If so, <B
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CLASS="COMMAND"
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>ifconfig</B
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> will show you the hardware layout
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of the network-interface.
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If you have problems making your cards work please read the
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Ethernet-HOWTO at
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<A
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HREF="http://www.linuxdoc.org/HOWTO/Ethernet-HOWTO.html"
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TARGET="_top"
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>http://www.linuxdoc.org/HOWTO/Ethernet-HOWTO.html</A
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>.
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Don't mess around with IP-addresses or net-masks.
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You will not need it, until you bridge fully operational an up.
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</P
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><P
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>After you did the steps mentioned above a
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<B
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CLASS="COMMAND"
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>modprobe -v bridge</B
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> should show no errors.
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You can check the success by issuing a
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<B
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CLASS="COMMAND"
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>cat /proc/modules</B
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>.
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Also for each of the network cards you want to use in the bridge
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the <B
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CLASS="COMMAND"
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>ifconfig <TT
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CLASS="USERINPUT"
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><B
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>whateverNameYourInterfaceHas</B
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></TT
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></B
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>
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should give you some information about the interface.
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</P
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><P
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>If your <SPAN
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CLASS="APPLICATION"
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>bridge-utilities</SPAN
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> have been
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correctly built and your kernel and bridge-module are OK, then
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issuing a <B
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CLASS="COMMAND"
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>brctl</B
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> should show a small command
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synopsis.
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</P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="BRCTL-SYNOPSIS"
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>6.1. <B
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CLASS="COMMAND"
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>brctl</B
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> Command Synopsis</A
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></H2
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>root@mbb-1:~ # brctl
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commands:
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addbr <bridge> add bridge <A
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NAME="BRCTL-ADDBR"
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><IMG
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SRC="../images/callouts/1.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(1)"></A
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>
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addif <bridge> <device> add interface to bridge <A
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NAME="BRCTL-ADDIF"
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><IMG
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SRC="../images/callouts/2.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(2)"></A
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>
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delbr <bridge> delete bridge <A
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NAME="BRCTL-DELBR"
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><IMG
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SRC="../images/callouts/3.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(3)"></A
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>
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delif <bridge> <device> delete interface from bridge <A
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NAME="BRCTL-DELIF"
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><IMG
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SRC="../images/callouts/4.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(4)"></A
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>
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show show a list of bridges <A
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NAME="BRCTL-SHOW"
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><IMG
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SRC="../images/callouts/5.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(5)"></A
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>
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showbr <bridge> show bridge info <A
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NAME="BRCTL-SHOWBR"
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><IMG
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SRC="../images/callouts/6.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(6)"></A
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>
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showmacs <bridge> show a list of mac addrs <A
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NAME="BRCTL-SHOWMACS"
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><IMG
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SRC="../images/callouts/7.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(7)"></A
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>
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setageing <bridge> <time> set ageing time <A
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NAME="BRCTL-SETAGEING"
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><IMG
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SRC="../images/callouts/8.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(8)"></A
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>
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setbridgeprio <bridge> <prio> set bridge priority <A
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NAME="BRCTL-SETBRIDGEPRIO"
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><IMG
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SRC="../images/callouts/9.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(9)"></A
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>
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setfd <bridge> <time> set bridge forward delay <A
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NAME="BRCTL-SETFD"
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><IMG
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SRC="../images/callouts/10.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(10)"></A
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>
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setgcint <bridge> <time> set garbage collection interval <A
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NAME="BRCTL-SETGCINT"
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><B
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>(11)</B
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></A
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>
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sethello <bridge> <time> set hello time <A
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NAME="BRCTL-SETHELLO"
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><B
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>(12)</B
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></A
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>
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setmaxage <bridge> <time> set max message age <A
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NAME="BRCTL-SETMAXAGE"
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><B
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>(13)</B
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></A
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>
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setpathcost <bridge> <port> <cost> set path cost <A
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NAME="BRCTL-SETPATHCOST"
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><B
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>(14)</B
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></A
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>
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setportprio <bridge> <port> <prio> set port priority <A
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NAME="BRCTL-SETPORTPRIO"
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><B
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>(15)</B
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></A
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>
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stp <bridge> <state> {dis,en}able stp <A
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NAME="BRCTL-STP"
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><B
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>(16)</B
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></A
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>
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</PRE
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></TD
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></TR
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></TABLE
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>
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</P
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><DIV
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CLASS="CALLOUTLIST"
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><DL
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COMPACT="COMPACT"
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><DT
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><A
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HREF="set-up-the-bridge.html#BRCTL-ADDBR"
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><IMG
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SRC="../images/callouts/1.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(1)"></A
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><A
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HREF="set-up-the-bridge.html#BRCTL-DELBR"
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><IMG
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SRC="../images/callouts/3.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(3)"></A
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></DT
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><DD
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>The
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<B
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CLASS="COMMAND"
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>brctl addbr <TT
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CLASS="USERINPUT"
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><B
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>bridgename</B
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></TT
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></B
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>
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command creates a logical bridge instance with the name
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<TT
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CLASS="USERINPUT"
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><B
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>bridgename</B
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></TT
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>.
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You will need at least one logical instance to do any bridging at
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all.
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You can interpret the logical bridge being a container for the
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interfaces taking part in the bridging.
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Each bridging instance is represented by a new network interface.
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</DD
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><DIV
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CLASS="EXAMPLE"
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><A
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NAME="CREATE-A-INSTANCE"
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></A
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><P
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><B
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>Example 6. Creating A Instance</B
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
|
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>root@mbb-1:~ # brctl addbr mybridge1
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</PRE
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></TD
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></TR
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></TABLE
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></DIV
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><DD
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><P
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>The corresponding <SPAN
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CLASS="QUOTE"
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>"shutdown"</SPAN
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> command is
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<B
|
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CLASS="COMMAND"
|
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>brctl delbr <TT
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CLASS="USERINPUT"
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><B
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>bridgename</B
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></TT
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></B
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>.
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<DIV
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|
CLASS="CAUTION"
|
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><P
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></P
|
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><TABLE
|
|
CLASS="CAUTION"
|
|
BORDER="1"
|
|
WIDTH="100%"
|
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><TR
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><TD
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ALIGN="CENTER"
|
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><B
|
|
>Caution</B
|
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></TD
|
|
></TR
|
|
><TR
|
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><TD
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|
ALIGN="LEFT"
|
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><P
|
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><B
|
|
CLASS="COMMAND"
|
|
>brctl delbr <TT
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CLASS="USERINPUT"
|
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><B
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>bridgename</B
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></TT
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></B
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>
|
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will only work, if there are no more interfaces added to the
|
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instance you want to delete.
|
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</P
|
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></TD
|
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></TR
|
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></TABLE
|
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></DIV
|
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>
|
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</P
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></DD
|
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><DT
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><A
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HREF="set-up-the-bridge.html#BRCTL-ADDIF"
|
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><IMG
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SRC="../images/callouts/2.gif"
|
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HSPACE="0"
|
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VSPACE="0"
|
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BORDER="0"
|
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ALT="(2)"></A
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><A
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HREF="set-up-the-bridge.html#BRCTL-DELIF"
|
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><IMG
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SRC="../images/callouts/4.gif"
|
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HSPACE="0"
|
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VSPACE="0"
|
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BORDER="0"
|
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ALT="(4)"></A
|
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></DT
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><DD
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|
>The
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<B
|
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CLASS="COMMAND"
|
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>brctl addif <TT
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CLASS="USERINPUT"
|
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><B
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>bridgename</B
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></TT
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>
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<TT
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|
CLASS="USERINPUT"
|
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><B
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>device</B
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></TT
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></B
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>
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command enslaves the network device <TT
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CLASS="USERINPUT"
|
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><B
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>device</B
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></TT
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>
|
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to take part in the bridging of <TT
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CLASS="USERINPUT"
|
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><B
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>bridgename</B
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></TT
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>.
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As a simple explanation, each interface enslaved into a instance
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is bridged to the other interfaces of the instance.
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</DD
|
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><DD
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><P
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>The corresponding command to tale a interface out of the bridge
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would be
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<B
|
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CLASS="COMMAND"
|
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>brctl delif <TT
|
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CLASS="USERINPUT"
|
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><B
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>bridgename</B
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></TT
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>
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<TT
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|
CLASS="USERINPUT"
|
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><B
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>device</B
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></TT
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></B
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>
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</P
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></DD
|
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><DT
|
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><A
|
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HREF="set-up-the-bridge.html#BRCTL-SHOW"
|
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><IMG
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SRC="../images/callouts/5.gif"
|
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HSPACE="0"
|
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VSPACE="0"
|
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BORDER="0"
|
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ALT="(5)"></A
|
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></DT
|
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><DD
|
|
>The <B
|
|
CLASS="COMMAND"
|
|
>brctl show</B
|
|
> command gives you a summary
|
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about the overall bridge status, and the instances running as
|
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shown in <A
|
|
HREF="set-up-the-bridge.html#BRCTL-SHOW-OUTPUT"
|
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>Example 7</A
|
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>.
|
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If you are interested in detailed information about a instance and
|
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it's interfaces you will have to check <A
|
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HREF="set-up-the-bridge.html#BRCTL-SHOWBR"
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SHOWBR"
|
|
><IMG
|
|
SRC="../images/callouts/6.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(6)"></A
|
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></A
|
|
>.
|
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</DD
|
|
><DIV
|
|
CLASS="EXAMPLE"
|
|
><A
|
|
NAME="BRCTL-SHOW-OUTPUT"
|
|
></A
|
|
><P
|
|
><B
|
|
>Example 7. Output Of <B
|
|
CLASS="COMMAND"
|
|
>brctl show</B
|
|
></B
|
|
></P
|
|
><TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # brctl show
|
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bridge name bridge id stp enabled
|
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mybridge1 0000.0800062815f6 yes
|
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</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SHOWBR"
|
|
><IMG
|
|
SRC="../images/callouts/6.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(6)"></A
|
|
></DT
|
|
><DD
|
|
>The <B
|
|
CLASS="COMMAND"
|
|
>brctl showbr <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>bridgename</B
|
|
></TT
|
|
></B
|
|
>
|
|
command gives you a summary about a bridge instance and it's enslaved
|
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interfaces.
|
|
</DD
|
|
><DIV
|
|
CLASS="EXAMPLE"
|
|
><A
|
|
NAME="BRCTL-SHOWBR-OUTPUT"
|
|
></A
|
|
><P
|
|
><B
|
|
>Example 8. Output Of <B
|
|
CLASS="COMMAND"
|
|
>brctl showbr <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>bridgename</B
|
|
></TT
|
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></B
|
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></B
|
|
></P
|
|
><TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
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><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # brctl showbr mybridge1
|
|
mybridge1
|
|
bridge id 0000.0800062815f6
|
|
designated root 0000.0800062815f6
|
|
root port 0 path cost 0
|
|
max age 4.00 bridge max age 4.00
|
|
hello time 1.00 bridge hello time 1.00
|
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forward delay 4.00 bridge forward delay 4.00
|
|
ageing time 300.00 gc interval 4.00
|
|
hello timer 0.84 tcn timer 0.00
|
|
topology change timer 0.00 gc timer 1.84
|
|
flags
|
|
|
|
|
|
eth0 (1)
|
|
port id 8001 state forwarding
|
|
designated root 0000.0800062815f6 path cost 100
|
|
designated bridge 0000.0800062815f6 message age timer 0.00
|
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designated port 8001 forward delay timer 0.00
|
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designated cost 0 hold timer 0.84
|
|
flags
|
|
|
|
eth1 (2)
|
|
port id 8002 state forwarding
|
|
designated root 0000.0800062815f6 path cost 100
|
|
designated bridge 0000.0800062815f6 message age timer 0.00
|
|
designated port 8002 forward delay timer 0.00
|
|
designated cost 0 hold timer 0.84
|
|
flags
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SHOWMACS"
|
|
><IMG
|
|
SRC="../images/callouts/7.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(7)"></A
|
|
></DT
|
|
><DD
|
|
>The <B
|
|
CLASS="COMMAND"
|
|
>brctl showmacs <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>bridgename</B
|
|
></TT
|
|
></B
|
|
>
|
|
command gives you a list of <SPAN
|
|
CLASS="ACRONYM"
|
|
>MAC</SPAN
|
|
>-addresses of the
|
|
interfaces which are enslaved in <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>bridgename</B
|
|
></TT
|
|
>.
|
|
</DD
|
|
><DIV
|
|
CLASS="EXAMPLE"
|
|
><A
|
|
NAME="BRCTL-SHOWMACS-OUTPUT"
|
|
></A
|
|
><P
|
|
><B
|
|
>Example 9. Output Of <B
|
|
CLASS="COMMAND"
|
|
>brctl showmacs <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>bridgename</B
|
|
></TT
|
|
></B
|
|
></B
|
|
></P
|
|
><TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # brctl showmacs mybridge1
|
|
port no mac addr is local? ageing timer
|
|
1 00:10:4b:b6:c6:e4 no 119.25
|
|
1 00:50:04:43:82:85 no 0.00
|
|
1 00:50:da:45:45:b1 no 76.75
|
|
1 00:a0:24:d0:4c:d6 yes 0.00
|
|
1 00:a0:24:f0:22:71 no 5.81
|
|
1 08:00:09:b5:dc:41 no 22.22
|
|
1 08:00:09:fb:39:a1 no 27.24
|
|
1 08:00:09:fc:92:2c no 53.13
|
|
4 08:00:09:fc:d2:11 yes 0.00
|
|
1 08:00:09:fd:23:88 no 230.42
|
|
1 08:00:09:fe:0d:6f no 144.55
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETAGEING"
|
|
><IMG
|
|
SRC="../images/callouts/8.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(8)"></A
|
|
></DT
|
|
><DD
|
|
>Sets the aging time.
|
|
The aging time is the number of seconds a <SPAN
|
|
CLASS="ACRONYM"
|
|
>MAC</SPAN
|
|
>-address will be
|
|
kept in the forwarding database after having received a packet
|
|
from this <SPAN
|
|
CLASS="ACRONYM"
|
|
>MAC</SPAN
|
|
> address.
|
|
The entries in the forwarding database are periodically timed out
|
|
to ensure they won't stay around forever.
|
|
Normally there should be no need to modify this parameter.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETBRIDGEPRIO"
|
|
><IMG
|
|
SRC="../images/callouts/9.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(9)"></A
|
|
></DT
|
|
><DD
|
|
>Sets the bridge's relative priority.
|
|
The bridge with the lowest priority will be elected as the root
|
|
bridge.
|
|
The root bridge is the <SPAN
|
|
CLASS="QUOTE"
|
|
>"central"</SPAN
|
|
> bridge in the
|
|
spanning tree.
|
|
More information about <SPAN
|
|
CLASS="ACRONYM"
|
|
>STP</SPAN
|
|
> you find at
|
|
<A
|
|
HREF="advanced-bridge.html#STP"
|
|
>Section 7.1</A
|
|
>.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETFD"
|
|
><IMG
|
|
SRC="../images/callouts/10.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(10)"></A
|
|
></DT
|
|
><DD
|
|
>Sets the forwarding delay time.
|
|
The forwarding delay time is the time spent in each of the
|
|
Listening and Learning states before the Forwarding state is
|
|
entered.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETGCINT"
|
|
><B
|
|
>(11)</B
|
|
></A
|
|
></DT
|
|
><DD
|
|
>Sets the garbage collection interval.
|
|
Every (this number) seconds, the entire forwarding database is
|
|
checked for timed-out entries.
|
|
The timed-out entries are removed.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETHELLO"
|
|
><B
|
|
>(12)</B
|
|
></A
|
|
></DT
|
|
><DD
|
|
>Sets the hello time.
|
|
Every (this number) seconds, a hello packet is sent out by the Root
|
|
Bridge and the Designated Bridges.
|
|
Hello packets are used to communicate information about the topology
|
|
throughout the entire Bridged Local Area Network.
|
|
More information about <SPAN
|
|
CLASS="ACRONYM"
|
|
>STP</SPAN
|
|
> you find at
|
|
<A
|
|
HREF="advanced-bridge.html#STP"
|
|
>Section 7.1</A
|
|
>.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETMAXAGE"
|
|
><B
|
|
>(13)</B
|
|
></A
|
|
></DT
|
|
><DD
|
|
>Sets the maximum message age.
|
|
If the last seen (received) hello packet is more than this number
|
|
of seconds old, the bridge in question will start the takeover
|
|
procedure in attempt to become the Root Bridge itself.
|
|
More information about <SPAN
|
|
CLASS="ACRONYM"
|
|
>STP</SPAN
|
|
> you find at
|
|
<A
|
|
HREF="advanced-bridge.html#STP"
|
|
>Section 7.1</A
|
|
>.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETPATHCOST"
|
|
><B
|
|
>(14)</B
|
|
></A
|
|
></DT
|
|
><DD
|
|
>Sets the cost of receiving (or sending, I'm not sure) a packet
|
|
on this interface.
|
|
Faster interfaces should have lower path costs.
|
|
These values are used in the computation of the minimal spanning
|
|
tree.
|
|
More information about <SPAN
|
|
CLASS="ACRONYM"
|
|
>STP</SPAN
|
|
> you find at
|
|
<A
|
|
HREF="advanced-bridge.html#STP"
|
|
>Section 7.1</A
|
|
>.
|
|
Paths with lower costs are likelier to be used in the spanning tree
|
|
than high-cost paths
|
|
(As an example, think of a gigabit line with a 100Mbit or 10Mbit
|
|
line as a backup line.
|
|
You don't want the 10/100Mbit line to become the primary line there.)
|
|
</DD
|
|
><DD
|
|
><P
|
|
> The Linux implementation currently sets the path cost of all eth*
|
|
interfaces to 100, the nominal cost for a 10Mbit connection. There is
|
|
unfortunately no easy way to discern 10Mbit from 100Mbit from 1Gbit
|
|
Ethernet cards, so the bridge cannot use the real interface speed.
|
|
</P
|
|
></DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-STP"
|
|
><B
|
|
>(16)</B
|
|
></A
|
|
></DT
|
|
><DD
|
|
>With this parameter you can enable or disable the Spanning Tree
|
|
Protocol.
|
|
</DD
|
|
><DT
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETBRIDGEPRIO"
|
|
><IMG
|
|
SRC="../images/callouts/9.gif"
|
|
HSPACE="0"
|
|
VSPACE="0"
|
|
BORDER="0"
|
|
ALT="(9)"></A
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETHELLO"
|
|
><B
|
|
>(12)</B
|
|
></A
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-SETPATHCOST"
|
|
><B
|
|
>(14)</B
|
|
></A
|
|
><A
|
|
HREF="set-up-the-bridge.html#BRCTL-STP"
|
|
><B
|
|
>(16)</B
|
|
></A
|
|
></DT
|
|
><DD
|
|
>This parameters are only of interest, if you have more than
|
|
one bridge in your LAN and stp enabled.
|
|
Before modifying them you should read
|
|
<A
|
|
HREF="advanced-bridge.html#STP"
|
|
>Section 7.1</A
|
|
>.
|
|
</DD
|
|
></DL
|
|
></DIV
|
|
></DIV
|
|
><DIV
|
|
CLASS="SECT2"
|
|
><H2
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="BASIC-SETUP"
|
|
>6.2. Basic Setup</A
|
|
></H2
|
|
><P
|
|
>The standard configuration should consist of:
|
|
</P
|
|
><P
|
|
></P
|
|
><OL
|
|
COMPACT="COMPACT"
|
|
TYPE="1"
|
|
><LI
|
|
><P
|
|
>Create the bridge interface.
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="90%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # brctl addbr mybridge
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Add interfaces to the bridge.
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="90%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # brctl addif mybridge eth0
|
|
root@mbb-1:~ # brctl addif mybridge eth1
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Zero IP the interfaces.
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="90%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # ifconfig eth0 0.0.0.0
|
|
root@mbb-1:~ # ifconfig eth1 0.0.0.0
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Put up the bridge.
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="90%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # ifconfig mybridge up
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
</P
|
|
></LI
|
|
><LI
|
|
><P
|
|
>Optionally you can configure the virtual interface
|
|
<TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>mybridge</B
|
|
></TT
|
|
> to take part in your network.
|
|
It behaves like one interface (like a normal network card).
|
|
Exactly that way you configure it, replacing the previous
|
|
command with something like:
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="90%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # ifconfig mybridge 192.168.100.5 netmask 255.255.255.0 up
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
</P
|
|
></LI
|
|
></OL
|
|
><P
|
|
>A more sophisticated setup script you will find at
|
|
<A
|
|
HREF="practical-example.html#BRIDGE-INIT-SCRIPT"
|
|
>Example 16</A
|
|
>.
|
|
</P
|
|
><DIV
|
|
CLASS="IMPORTANT"
|
|
><BLOCKQUOTE
|
|
CLASS="IMPORTANT"
|
|
><P
|
|
><B
|
|
>Important: </B
|
|
>If you get the terrible experience of a frozen system or
|
|
some nasty behavior of your nicely shaped linux box at
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # ifconfig eth<TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>n</B
|
|
></TT
|
|
> 0 0.0.0.0
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
please try (after the reboot of the system if necessary)
|
|
before starting any bridge stuff at all a
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>root@mbb-1:~ # ifconfig eth<TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>n</B
|
|
></TT
|
|
> promisc up
|
|
</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
>
|
|
If again your system is frozen it's you NIC's driver you have to blame,
|
|
not the bridging code.
|
|
</P
|
|
></BLOCKQUOTE
|
|
></DIV
|
|
></DIV
|
|
></DIV
|
|
><DIV
|
|
CLASS="NAVFOOTER"
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"><TABLE
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="preparing-the-bridge.html"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="index.html"
|
|
>Home</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="advanced-bridge.html"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
>Preparing The Bridge</TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
> </TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
>Advanced Bridge Features</TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
></BODY
|
|
></HTML
|
|
> |