iptables and udp socket

[Keserű Kornél]

Dear List members,

I'm quite new to netfilter/iptables, I have been using it for some weeks. 
I would like to ask if it may lead to undeterministic behaviour of iptables 
when an udp socket is opened on an IP:port while in parallel iptables 
rules (NAT) are setup that forward all incoming packets received on 
that IP:port to a different destination. So I just want to use the socket 
for sending out packets on it, while incoming packets should be 
forwarded to other destination. But sometimes the packets are 
received on the socket, sometimes they are forwarded. So iptables 
don't have always the expected effect.
I use Debian with iptables 1.2.11.

What is your opinion?

Best regards,
Kornel Keseru

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