SNAT issue for locally generated UDP packet

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Hi all,

I am trying to source nat the packet generated locally using iptables. Machine is running Fedora core2 and one of the interface address is 5.5.5.7. Sip server sends a packet with source port 5060 and ip address 5.5.5.7. I want to change the IP address and the source port when it goes out. Reading the IPtables manual only rule i can think of is iptables -t nat -A POSTROUTING --protocol udp --source-port 5060 -j SNAT --to-source 5.5.5.7:1024-32000.
[root@sipserver2 ~]# uname -a
Linux sipserver2.baski.com 2.6.9-1.667 #1 Tue Nov 2 14:41:25 EST 2004 i686 i686 i386 GNU/Linux Unfortunately it does not work. IPtables also says that locally generated packets are modified in the output chain and there is not NAT capability in there. I went through all the messages in the archive for SNAT and OUTPUT, So I would really appreciate any help on this. If there is any patch available for this I am ready to try.

Thanks and Regards
..baski


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