Let's see what will the bible say:
http://iptables-tutorial.frozentux.net/iptables-tutorial.html#UDPCONNECTIONS
:)
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From: "Mr Vandeley" <mr.vandeley@xxxxxxxxx>
Sent: Friday, January 30, 2009 9:50 PM
To: <netfilter@xxxxxxxxxxxxxxx>
Subject: newbie question: UDP is stateless ... right?
Hi,
Please, excuse me this newbie question, but I don't understand
correctly. For what I know, UDP connections are not statefull, so I
can't track them... right?
What I've been doing on my firewalls was explicitely accepting
incoming packets from UDP privileged ports and so accepting answers to
my UDP requests. Now I have found that if I accept RELATED,ESTABLISHED
traffic without saying anything about the protocol, UDP answers will
be accepted.
I know that this isn't a question related to Netfilter but is the only
place I know to ask about this.
thanks.
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