mirror of https://github.com/tLDP/LDP
updated
This commit is contained in:
parent
3024fefa1c
commit
01553d771d
|
@ -1913,7 +1913,7 @@ chains software for Linux, and some ideas on how you might use them. </Para>
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IP-Masquerade-HOWTO</ULink>,
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<CiteTitle>Linux IP Masquerade HOWTO</CiteTitle>
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</Para><Para>
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<CiteTitle>Updated: Jun 2003</CiteTitle>.
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<CiteTitle>Updated: Nov 2003</CiteTitle>.
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How to enable the Linux IP Masquerade feature on a given Linux host. </Para>
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</ListItem>
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@ -965,7 +965,7 @@ A beginning document for using Portslave with the Linux router. </Para>
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IP-Masquerade-HOWTO</ULink>,
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<CiteTitle>Linux IP Masquerade HOWTO</CiteTitle>
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</Para><Para>
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<CiteTitle>Updated: Jun 2003</CiteTitle>.
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<CiteTitle>Updated: Nov 2003</CiteTitle>.
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How to enable the Linux IP Masquerade feature on a given Linux host. </Para>
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</ListItem>
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@ -16,13 +16,9 @@
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</AUTHOR>
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<pubdate>
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v2.00.062203, June 22, 2003
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v2.00.110903, 2003-11-09
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</pubdate>
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<Abstract>
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<para>
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v2.00.062203, June 22, 2003
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</para>
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<para>
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This document describes how to enable the Linux IP Masquerade feature on a
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given Linux host. IP Masquerade is a form of Network Address Translation or
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@ -30,7 +26,6 @@ NAT which NAT allows internally connected computers that do not have one or more
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registered Internet IP addresses to communicate to the Internet via the Linux
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server's Internet IP address.
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</para>
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</Abstract>
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</BookInfo>
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@ -490,7 +485,7 @@ The second system (which does not need to be Linux) connects into the
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Linux #1 box and starts its network traffic to the Internet. This second
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machine does NOT have a publicly assigned IP address from the Internet, so it
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uses an
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<ULink URL="http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc1918.html">
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<ULink URL="http://www.ietf.org/rfc/rfc1918.txt?number=1918">
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RFC1918 private address</ULink>, say 192.168.0.100. (see below for more info)
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</para>
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@ -717,7 +712,7 @@ Please also keep in mind that there might be several benefits in performing a
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full ruleset re-write to take advantage of the newer IPTABLES features like
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stateful tracking, etc. but that is dependant upon how much time you have to
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migrate your old rulesets. Please see <XRef LinkEnd="ipchains-on-2.4.x"> for
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addutional details.
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additional details.
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</para>
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</listitem>
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</ItemizedList>
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@ -3652,7 +3647,7 @@ SIMPLE ruleset:
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#!/bin/sh
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#
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# rc.firewall-2.4
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FWVER=0.74
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FWVER=0.75
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#
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# Initial SIMPLE IP Masquerade test for 2.4.x kernels
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# using IPTABLES.
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@ -3665,6 +3660,7 @@ FWVER=0.74
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#
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#
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# Log:
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# 0.75 - Added more kernel modules to the comments section
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# 0.74 - the ruleset now uses modprobe vs. insmod
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# 0.73 - REJECT is not a legal policy yet; back to DROP
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# 0.72 - Changed the default block behavior to REJECT not DROP
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@ -3824,7 +3820,7 @@ $MODPROBE ip_nat_ftp
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#Loads the IRC NAT functionality into the core IPTABLES code
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# Require to support NAT of IRC DCC requests
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# Required to support NAT of IRC DCC requests
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#
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# Disabled by default -- remove the "#" on the next line to activate
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#
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@ -3833,11 +3829,22 @@ $MODPROBE ip_nat_ftp
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echo "----------------------------------------------------------------------"
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# Just to be complete, here is a list of the remaining kernel modules
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# and their function. Please note that several modules should be only
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# loaded by the correct master kernel module for proper operation.
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# Just to be complete, here is a partial list of some of the other
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# IPTABLES kernel modules and their function. Please note that most
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# of these modules (the ipt ones) are automatically loaded by the
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# master kernel module for proper operation and don't need to be
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# manually loaded.
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# --------------------------------------------------------------------
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#
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# ip_nat_snmp_basic - this module allows for proper NATing of some
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# SNMP traffic
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#
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# iptable_mangle - this target allows for packets to be
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# manipulated for things like the TCPMSS
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# option, etc.
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#
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# --
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#
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# ipt_mark - this target marks a given packet for future action.
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# This automatically loads the ipt_MARK module
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#
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@ -3868,8 +3875,6 @@ echo "----------------------------------------------------------------------"
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# a configurable ICMP packet back to the
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# sender.
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#
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# iptable_mangle - this target allows for packets to be manipulated
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# for things like the TCPMSS option, etc.
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echo -e " Done loading modules.\n"
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@ -6407,7 +6412,7 @@ running properly:
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<Title>Loading up the rc.firewall ruleset</Title>
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<para>
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Ok, run the command "/etc/rc.d/rc.firewall".
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Step One: run the command "/etc/rc.d/rc.firewall".
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</para>
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<para>
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@ -6500,7 +6505,7 @@ invalid IO or IRQ parameters
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<ItemizedList>
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<listitem>
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<para>
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<Emphasis role="strong">Step One: Testing internal MASQ client PC connectivity
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<Emphasis role="strong">Step Two: Testing internal MASQ client PC connectivity
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</Emphasis>
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</para>
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@ -6547,7 +6552,7 @@ round-trip min/avg/max = 0.4/0.5/0.8 ms
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<listitem>
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<para>
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<Emphasis role="strong">Step Two: Testing internal MASQ client to MASQ server
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<Emphasis role="strong">Step Three: Testing internal MASQ client to MASQ server
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connectivity</Emphasis>
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</para>
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@ -6613,7 +6618,7 @@ caused them all kinds of grief.
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<listitem>
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<para>
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<Emphasis role="strong">Step Three: Testing internal MASQ server connectivity
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<Emphasis role="strong">Step Four: Testing internal MASQ server connectivity
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</Emphasis>
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</para>
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@ -6660,7 +6665,7 @@ round-trip min/avg/max = 0.4/0.5/0.8 ms
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<listitem>
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<para>
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<Emphasis role="strong">Step Four: Testing internal MASQ server to MASQ client
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<Emphasis role="strong">Step Five: Testing internal MASQ server to MASQ client
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connectivity</Emphasis>
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</para>
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@ -6701,13 +6706,13 @@ round-trip min/avg/max = 0.4/0.5/0.8 ms
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<Sect1 id="testing-masq-server-external">
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<Title>Testing External Internet connectivity</Title>
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<Title>Testing External MASQ server Internet connectivity</Title>
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<ItemizedList>
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<listitem>
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<para>
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<Emphasis role="strong">Step Five: Testing External MASQ server Intenret Linux
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<Emphasis role="strong">Step Six: Testing external MASQ server to Internet
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connectivity</Emphasis
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</para>
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@ -6820,7 +6825,7 @@ your
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<listitem>
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<para>
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<Emphasis role="strong">Step Six: Testing internal MASQ client to external MASQ
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<Emphasis role="strong">Step Seven: Testing internal MASQ client to external MASQ
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server connectivity</Emphasis>
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</para>
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@ -6956,7 +6961,7 @@ ACCEPT all ----l- 0.0.0.0/0 0.0.0.0/0 n/a
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<listitem>
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<para>
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<Emphasis role="strong">Step Seven: Testing external MASQ ICMP forwarding</Emphasis>
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<Emphasis role="strong">Step Eight: Testing external MASQ ICMP forwarding</Emphasis>
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</para>
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<para>
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@ -7016,7 +7021,7 @@ like "eth0".
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<listitem>
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<para>
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<Emphasis role="strong">Step Eight: Testing MASQ functionality without DNS</Emphasis>
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<Emphasis role="strong">Step Nine: Testing MASQ functionality without DNS</Emphasis>
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</para>
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<para>
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@ -7066,7 +7071,7 @@ login: Connection closed by foreign host.
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<ItemizedList>
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<listitem>
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<para>
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<Emphasis role="strong">Step Nine: Testing MASQ functionality with DNS
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<Emphasis role="strong">Step Ten: Testing MASQ functionality with DNS
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resolution
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</Emphasis>
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</para>
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@ -7124,7 +7129,7 @@ servers but this is beyond the scope of this HOWTO.
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<listitem>
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<para>
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<Emphasis role="strong">Step Ten: Testing more MASQ functionality with DNS</Emphasis>
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<Emphasis role="strong">Step Eleven: Testing more MASQ functionality with DNS</Emphasis>
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</para>
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<para>
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@ -7167,7 +7172,7 @@ a given IP MASQ module).
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<ItemizedList>
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<listitem>
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<para>
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<Emphasis role="strong">Step Eleven: Any remaining functional, performance,
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<Emphasis role="strong">Step Twelve: Any remaining functional, performance,
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etc. issues...</Emphasis>
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</para>
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@ -7822,13 +7827,16 @@ Cannot work at present (it makes invalid assumptions about addresses).
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#
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# rc.firewall-2.4-stronger
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#
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FWVER=0.79s
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FWVER=0.80s
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# An example of a stronger IPTABLES firewall with IP Masquerade
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# support for 2.4.x kernels.
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#
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# Log:
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#
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# 0.80s - Added a DISABLED ip_nat_irc kernel module section, changed the
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# default of the ip_conntrack_irc to NOT load by default, and
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# added additional kernel module comments
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# 0.79s - ruleset now uses modprobe instead of insmod
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# 0.78s - REJECT is not a legal policy yet; back to DROP
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# 0.77s - Changed the default block behavior to REJECT not DROP
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@ -8067,15 +8075,15 @@ fi
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#Load the IRC tracking mechanism for full IRC tracking
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#
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# Enabled by default -- insert a "#" on the next line to deactivate
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# Disabled by default -- insert a "#" on the next few lines to activate
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#
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echo -en " ip_conntrack_irc, "
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# echo -en " ip_conntrack_irc, "
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#
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#Verify the module isn't loaded. If it is, skip it
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#
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if [ -z "` $LSMOD | $GREP ip_conntrack_irc | $AWK {'print $1'} `" ]; then
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$MODPROBE ip_conntrack_irc
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fi
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# if [ -z "` $LSMOD | $GREP ip_conntrack_irc | $AWK {'print $1'} `" ]; then
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# $MODPROBE ip_conntrack_irc
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# fi
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#Load the general IPTABLES NAT code - "iptable_nat"
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@ -8105,13 +8113,38 @@ if [ -z "` $LSMOD | $GREP ip_nat_ftp | $AWK {'print $1'} `" ]; then
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$MODPROBE ip_nat_ftp
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fi
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#Loads the IRC NAT functionality (for DCC) into the core IPTABLES code
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#
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# DISABLED by default -- delete the "#" on the next few lines to activate
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#
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# echo -e "ip_nat_irc"
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#
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#Verify the module isn't loaded. If it is, skip it
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#
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# if [ -z "` $LSMOD | $GREP ip_nat_irc | $AWK {'print $1'} `" ]; then
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# $MODPROBE ip_nat_irc
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# fi
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|
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|
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echo " ---"
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|
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# Just to be complete, here is a list of the remaining kernel modules
|
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# and their function. Please note that several modules should be only
|
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# loaded by the correct master kernel module for proper operation.
|
||||
# Just to be complete, here is a partial list of some of the other
|
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# IPTABLES kernel modules and their function. Please note that most
|
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# of these modules (the ipt ones) are automatically loaded by the
|
||||
# master kernel module for proper operation and don't need to be
|
||||
# manually loaded.
|
||||
# --------------------------------------------------------------------
|
||||
#
|
||||
# ip_nat_snmp_basic - this module allows for proper NATing of some
|
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# SNMP traffic
|
||||
#
|
||||
# iptable_mangle - this target allows for packets to be
|
||||
# manipulated for things like the TCPMSS
|
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# option, etc.
|
||||
#
|
||||
# --
|
||||
#
|
||||
# ipt_mark - this target marks a given packet for future action.
|
||||
# This automatically loads the ipt_MARK module
|
||||
#
|
||||
|
@ -8141,9 +8174,6 @@ echo " ---"
|
|||
# ipt_REJECT - this target DROPs the packet and returns
|
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# a configurable ICMP packet back to the
|
||||
# sender.
|
||||
#
|
||||
# iptable_mangle - this target allows for packets to be manipulated
|
||||
# for things like the TCPMSS option, etc.
|
||||
|
||||
|
||||
#CRITICAL: Enable IP forwarding since it is disabled by default since
|
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|
@ -10703,6 +10733,12 @@ Debian v2.2 : YES - 2.2.15 based
|
|||
</para>
|
||||
</listitem>
|
||||
|
||||
<listitem>
|
||||
<para>
|
||||
Debian v3.0 : YES - 2.4.18 based
|
||||
</para>
|
||||
</listitem>
|
||||
|
||||
<listitem>
|
||||
<para>
|
||||
DLX Linux v? : ? - ?
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|
@ -11726,10 +11762,10 @@ nasty MTU problem:
|
|||
<para>
|
||||
You can find more info about this topic on the web. Specifically, here is
|
||||
good presentaion on the topic:
|
||||
<ULink URL="http://www.trust-factory.com/mss-talk.pdf">mss-talk presentation
|
||||
<ULink URL="http://www.phildev.net/mss/mss-talk.pdf">mss-talk presentation
|
||||
(PDF)</ULink>. Here is the entire
|
||||
<ULink URL=" http://www.trust-factory.com/van_den_berg-lisa02.pdf">Write
|
||||
up (PDF)</ULink>
|
||||
<ULink URL="http://www.phildev.net/mss/lisa.html">Write
|
||||
up and other good info</ULink>
|
||||
</para>
|
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|
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<para>
|
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|
@ -12516,20 +12552,20 @@ There is probably a few common things that you are going to see:
|
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<ItemizedList>
|
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<listitem>
|
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<para>
|
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<Emphasis role="strong">MASQ: Failed TCP Checksum error:</Emphasis> You will
|
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see this error when a packet coming from the Internet gets corrupt in the data
|
||||
section of the packet but the rest of it "seems" ok. When the Linux box
|
||||
receives this packet, it will calculate the CRC of the packet and determine
|
||||
that its corrupt. On most machines running OSes like Microsoft Windows, they
|
||||
just silently drop the packets but Linux IP MASQ reports it. If you get a LOT
|
||||
of them over your PPP link, first follow the FAQ entry above for "(Performance)
|
||||
- Masq seems is slow".
|
||||
<Emphasis role="strong">MASQ: Failed TCP Checksum error:</Emphasis> You
|
||||
might see this error when a packet coming from the Internet gets corrupt in
|
||||
the data section of the packet but the rest of it "seems" ok. When the Linux
|
||||
box receives this packet, it will calculate the CRC of the packet and
|
||||
determine that its corrupt. On most machines running OSes like Microsoft
|
||||
Windows, they just silently drop the packets but Linux IP MASQ reports it. If
|
||||
you get a LOT of them over your PPP link, first follow the FAQ entry above for
|
||||
"(Performance) - Masq seems is slow".
|
||||
</para>
|
||||
|
||||
<para>
|
||||
If the (Performance) FAQ tips don't help and you run PPP over dialup or PPPoE,
|
||||
you might try adding the line "-vj" to your /etc/ppp/options file and restart
|
||||
the PPPd connection.
|
||||
you might try adding the line "-vj" (disabled VanJacobson header compression) to
|
||||
your /etc/ppp/options file and restart the PPPd connection.
|
||||
</para>
|
||||
</listitem>
|
||||
|
||||
|
@ -12539,13 +12575,17 @@ the PPPd connection.
|
|||
Internet with a decent firewall, you will be surprised with the number of users
|
||||
trying to penetrate your Linux box! So what do all these firewall logs mean?
|
||||
</para>
|
||||
<para>
|
||||
More so, if they are filling your logs, see the next FAQ entry on thoughts
|
||||
<Emphasis>how to reduce</Emphasis> all these log entries.
|
||||
</para>
|
||||
</listitem>
|
||||
|
||||
<listitem>
|
||||
<para>
|
||||
From the
|
||||
The following details are from the
|
||||
<ULink URL="http://www.ecst.csuchico.edu/~dranch/LINUX/index-linux.html#TrinityOS">TrinityOS - Section 10</ULink>
|
||||
doc:
|
||||
documentation I also wrote:
|
||||
</para>
|
||||
|
||||
<para>
|
||||
|
@ -12815,6 +12855,79 @@ read this.
|
|||
|
||||
</Sect1>
|
||||
|
||||
<Sect1 id="reducing-masq-logs">
|
||||
<Title>( Log Reduction ) - My logs are filling up with packet hits due to the
|
||||
new "stronger" rulesets. How can I fix this? </Title>
|
||||
|
||||
<para>
|
||||
So your realizing that a good firewall is catching a LOT of bad Internet
|
||||
traffic. That's a good thing but it's also filling up your logs to the point
|
||||
that you won't read them; that's bad.
|
||||
What to do?
|
||||
</para>
|
||||
<para>
|
||||
What you need to figure out is what traffic you DON"T want to log, explicitly
|
||||
match those packets in the firewall, and NOT log the packets when you drop
|
||||
them.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
For example, the TrinityOS firewall ruleset in section 10.7 (this would be a
|
||||
"strongest" ruleset in IPMASQ speak) gives some ideas:
|
||||
<ULink
|
||||
URL="http://www.ecst.csuchico.edu/~dranch/LINUX/TrinityOS/cHTML/TrinityOS-c-10.html">
|
||||
TrinityOS - Section 10.7</Ulink>
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Things I recommend to filter:
|
||||
<ItemizedList>
|
||||
<listitem>
|
||||
<para>All RFC1918 address space (TCP/IP address ranges: 10.x.y.z/8,
|
||||
172.16-31.y.z/12, and 192.168.y.x/16). You should /never/ receive these
|
||||
packets from an Internet connection. If you do, they are most likely spoofed
|
||||
packets</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Windows File and Print Sharing (Samba or CIFS): ports 137, 138, 139,
|
||||
and 445. Windows machines like to talk a lot though most computers don't care
|
||||
what they're saying.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Class-D Multicast addresses (if you don't use Multicast): 224.0.0.0/4
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Class-E and F "future" addresses: 240.0.0.0/5 and 248.0.0.0/5
|
||||
</para>
|
||||
</listitem>
|
||||
</ItemizedList>
|
||||
</para>
|
||||
|
||||
<para>
|
||||
To a much lesser extent, you might want to filter other packets. I recommend
|
||||
that you verify that you are receiving these specific packet types before
|
||||
you filter them out.
|
||||
<ItemizedList>
|
||||
<listitem>
|
||||
<para>RIP (the routing protocol): port 520</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Some specific forms of ICMP packets - NOT all of them (that will
|
||||
break your machine and IPMASQ in general)</para>
|
||||
</listitem>
|
||||
</ItemizedList>
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Finally, you'll probably find that some individual TCP/IP address out on the
|
||||
Internet always seem to attack your IP. So, in addition to filtering various
|
||||
PORTS like above, you might want to also filter by specific SOURCE IP address
|
||||
too. After all, it is *YOUR* firewall.
|
||||
</para>
|
||||
|
||||
</Sect1>
|
||||
|
||||
<Sect1 id="masq-host-security">
|
||||
<Title>( MASQ Security ) - Can I configure IP MASQ to allow Internet users to
|
||||
directly contact internal MASQed servers?</Title>
|
||||
|
@ -14738,6 +14851,47 @@ Update the portfw FTP patch
|
|||
<!-- Blah -->
|
||||
|
||||
<!-- ChangeLOG -->
|
||||
<para>
|
||||
Changes from 06/22/03 to 11/09/03
|
||||
<ItemizedList>
|
||||
<listitem>
|
||||
<para>
|
||||
10/25/03: Fixed a dead RFC1918 URL in section 3.3. Thanks to Mark Sobell for the report.
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>
|
||||
07/07/03: Added the "reducing-masq-log" FAQ entry to help people reduce the
|
||||
size of their firewall logs.
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>
|
||||
06/27/03: Updated the rc.firewall-2.4-stronger ruleset to 0.80s. Added a
|
||||
DISABLED ip_nat_irc kernel module section, changed the default of the
|
||||
ip_conntrack_irc to NOT load by default, and added additional kernel module
|
||||
comments.
|
||||
</para>
|
||||
</listitem
|
||||
<listitem>
|
||||
<para>
|
||||
06/27/03: Updated the rc.firewall-2.4 ruleset to 0.75. Added additional
|
||||
iptables kernel module comments.
|
||||
</para>
|
||||
</listitem
|
||||
<listitem>
|
||||
<para>
|
||||
06/24/03: Added Debian 3.0 to the supported distro list
|
||||
</para>
|
||||
</listitem
|
||||
<listitem>
|
||||
<para>
|
||||
06/23/03: Change the PMTU URLs to point to Phil's primary www site
|
||||
</para>
|
||||
</listitem
|
||||
</ItemizedList
|
||||
</para
|
||||
|
||||
<para>
|
||||
Changes from 05/26/03 to 06/22/03
|
||||
<ItemizedList>
|
||||
|
|
Loading…
Reference in New Issue