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Special Forums IP Networking block windows file sharing traffic between networks Post 302578822 by Corona688 on Friday 2nd of December 2011 11:35:04 AM
Old 12-02-2011
That's odd. It usually doesn't make sense to route SMB traffic at all. Do the computers believe they're all on one big subnet? That'd be more like bridging.

Anyway. I can't guarantee this is correct, being I rarely use iptables directly, but I think I have the right idea: Explicitly allow traffic to/from your printer's IP, then explicitly deny everything else. The first rule will match your printer traffic, the rest won't and will go to the next rule which will drop it.

Code:
# Assuming your printer's IP is 192.0.3.1
# Accept 0.0 -> printer traffic
iptables -A forward --source 192.0.0.0/24 --destination 192.0.3.1 -j ACCEPT
# Accept printer -> 0.0 traffic
iptables -A forward --source 192.0.3.1 --destination 192.0.0.0/255.255.255.0 -j ACCEPT
# Reject everything 0.0 -> 3.0
iptables -A forward --source 192.0.0.0/24 --destination 192.0.3.0/255.255.255.0 -j DROP
# Reject everything 3.0 -> 0.0
iptables -A forward --source 192.0.3.0/24 --destination 192.0.0.0/24 -j DROP

 

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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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