From mboxrd@z Thu Jan  1 00:00:00 1970
From: Baskaran Mohandass <baski@foundrynet.com>
Subject: SNAT packet generated by the machine running iptables
Date: Mon, 13 Jun 2005 11:41:49 -0700
Message-ID: <42ADD36D.8060104@foundrynet.com>
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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.
TIA
..baski