Matching UDP pattern

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To: Netfilter Users <netfilter@xxxxxxxxxxxxxxxxxxx>
Subject: Matching UDP pattern
From: Kenneth Porter <shiva@xxxxxxxxxxxxxxx>
Date: Tue, 09 Nov 2004 05:04:12 -0800
Sender: netfilter-bounces@xxxxxxxxxxxxxxxxxxx

I need to identify a UDP packet with a particular fixed 5-byte payload arriving at a particular port, and signal userland when this packet is seen, identifying the IP address it came from. Can iptables do this, or perhaps tcpdump? What modules should I be looking at?

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