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Top Forums UNIX for Dummies Questions & Answers IPtable Post 302491468 by pludi on Thursday 27th of January 2011 02:13:40 PM
Old 01-27-2011
Sure. Eg, block anything not comming from the 192.168.0.0/24 network:
Code:
iptables -I INPUT 1 '!' --src 192.168.0.0/24 -j DROP

For a larger list it's probably better to create a special chain:
Code:
iptables -N whitelist
iptables -A whitelist --src 192.168.0.0/24 -j ACCEPT
iptables -A whitelist --src 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j whitelist
iptables -A INPUT -p udp --port 53 -j whitelist

In the second example all incoming packets are first matched for their protocol and port, and only then where they are coming from.
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IPTABLES-XML(8) 														   IPTABLES-XML(8)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) Jul 16, 2007 IPTABLES-XML(8)
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