Ubuntu
iptables package

need help reading an iptables rule

Asked by kapthar

Can someone interpret the meaning of the following iptables rule? It has the ! set and this is confusing me. Thanks in advance.
KapHar

-A INPUT -s 81.174.95.44/32 -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j ACCEPT

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Eliah Kagan
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Best Eliah Kagan (degeneracypressure) said : 		#1

The ! inverts the argument that comes right after it. Please also see the explanation of --tcp-flags in the iptables manual page (Maverick version: http://manpages.ubuntu.com/manpages/maverick/en/man8/iptables.8.html). Please post a reply if you need further information.

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kapthar (bizhost) said : 		#2

Thanks Eliah Kagan, that solved my question.