297 lines
5.4 KiB
HTML
297 lines
5.4 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Commands</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.60"><LINK
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TITLE="Setting up IP Aliasing on A Linux Machine Mini-HOWTO"
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TITLE="Troubleshooting: Questions and Answers"
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>Setting up IP Aliasing on A Linux Machine Mini-HOWTO</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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><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="COMMANDS"
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>2. Commands</A
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></H1
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><P
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></P
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><OL
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TYPE="1"
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><LI
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><P
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>Load the IP Alias module (you can skip this step if you compiled
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the module into the kernel):</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="90%"
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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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>/sbin/insmod /lib/modules/`uname -r`/ipv4/ip_alias.o</PRE
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></TD
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></TR
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></TABLE
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></LI
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><LI
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><P
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>Setup the loopback, eth0, and all the IP addresses beginning with the
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main IP address for the eth0 interface:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="90%"
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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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>/sbin/ifconfig lo 127.0.0.1
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/sbin/ifconfig eth0 up
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/sbin/ifconfig eth0 172.16.3.1
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/sbin/ifconfig eth0:0 172.16.3.10
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/sbin/ifconfig eth0:1 172.16.3.100</PRE
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></TD
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></TR
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></TABLE
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><P
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>172.16.3.1 is the main IP address, while .10 and .100 are the aliases. The
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magic is the eth0:x where x=0,1,2,...n for the different IP addresses. The
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main IP address does not need to be aliased.</P
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></LI
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><LI
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><P
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>Setup the routes. First route the loopback, then the net, and
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finally, the various IP addresses starting with the default (originally
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allocated) one:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="90%"
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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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>/sbin/route add -net 127.0.0.0
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/sbin/route add -net 172.16.3.0 dev eth0
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/sbin/route add -host 172.16.3.1 dev eth0
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/sbin/route add -host 172.16.3.10 dev eth0:0
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/sbin/route add -host 172.16.3.100 dev eth0:1
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/sbin/route add default gw 172.16.3.200</PRE
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></TD
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></TR
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></TABLE
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><P
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>That's it.</P
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></LI
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></OL
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><P
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>In the example IP address above, I am using the Private IP addresses (RFC 1918) for
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illustrative purposes. Substitute them with your own official or private IP
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addresses.</P
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><P
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>The example shows only 3 IP addresses. The max is defined to be 256 in
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<TT
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CLASS="FILENAME"
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>/usr/include/linux/net_alias.h.</TT
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> 256 IP addresses on ONE card is a lot :-)!</P
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><P
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>Here's what my <TT
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CLASS="FILENAME"
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>/sbin/ifconfig</TT
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> looks like:</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="PROGRAMLISTING"
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>lo Link encap:Local Loopback
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inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0
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UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1
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RX packets:5088 errors:0 dropped:0 overruns:0
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TX packets:5088 errors:0 dropped:0 overruns:0
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eth0 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20
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inet addr:172.16.3.1 Bcast:172.16.3.255 Mask:255.255.255.0
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UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
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RX packets:334036 errors:0 dropped:0 overruns:0
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TX packets:11605 errors:0 dropped:0 overruns:0
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Interrupt:7 Base address:0x378
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eth0:0 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20
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inet addr:172.16.3.10 Bcast:172.16.3.255 Mask:255.255.255.0
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UP BROADCAST RUNNING MTU:1500 Metric:1
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RX packets:0 errors:0 dropped:0 overruns:0
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TX packets:0 errors:0 dropped:0 overruns:0
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eth0:1 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20
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inet addr:172.16.3.100 Bcast:172.16.3.255 Mask:255.255.255.0
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UP BROADCAST RUNNING MTU:1500 Metric:1
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RX packets:1 errors:0 dropped:0 overruns:0
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TX packets:0 errors:0 dropped:0 overruns:0</PRE
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></TD
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></TR
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></TABLE
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><P
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>And <TT
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CLASS="FILENAME"
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>/proc/net/aliases</TT
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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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>device family address
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eth0:0 2 172.16.3.10
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eth0:1 2 172.16.3.100</PRE
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></TD
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></TR
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></TABLE
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><P
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>And <TT
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CLASS="FILENAME"
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>/proc/net/alias_types</TT
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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="PROGRAMLISTING"
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>type name n_attach
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2 ip 2</PRE
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></TD
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></TR
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></TABLE
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><P
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>Of course, the stuff in <TT
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CLASS="FILENAME"
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>/proc/net</TT
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> was created by the <B
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CLASS="COMMAND"
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>ifconfig</B
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> command and
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not by hand!</P
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></DIV
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><TR
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ALIGN="left"
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HREF="mysetup.html"
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>Prev</A
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ALIGN="center"
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VALIGN="top"
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HREF="index.html"
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>Home</A
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></TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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HREF="troubleshooting.html"
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>Next</A
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>My Setup</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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><TD
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WIDTH="33%"
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VALIGN="top"
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>Troubleshooting: Questions and Answers</TD
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