From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jim Laurino <nfcan.x.jimlaur@dfgh.net>
Subject: Re: Forwarding while on same subnet...confusions (nfcan: addressed
	to exclusive sender for this address)
Date: Thu, 25 Nov 2004 10:07:11 -0500
Message-ID: <20041125150711.GA27717@salty>
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On 2004.11.23 14:09, Mike Smith - mismith356@gmail.com wrote:
> Hello All,
>
.......
> and then, after some google'ing and reading:
> 
> iptables -t nat -A POSTROUTING -s 138.1.89.6 -p tcp --dport 80 -j SNAT
> --to 138.1.88.246
>

One more observation.
The postrouting is looking for packets with a *destination* port 80.

I think this rule is meant to deal with packets from the apache server
returning to the client. I think apache will have a well known
*source* port of 80 in this case, the destination port is random.

You could look with a sniffer to check.
Or look at the packet counters to see if it is matching.
........