Re: How to change source address of packets destined for the box?

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On Friday 2010-03-26 00:07, Ajay Lele wrote:
>
>For a peculiar VPN address management scenario, I want to change
>source address of incoming packet destined for the box (inner IP
>packet in the IPsec tunnel terminated on the box) to a certain value.
>With iptables, SNAT can be configured only for POSTROUTING chain which
>won't be hit in this case as the packet is destined for the box.

Do the SNAT on the tunnel entry point, not the exit point.

>Googling showed an old thread which discusses similar issue.. looks
>like at that time there was no other way to achieve this. Does it
>still hold good?
>http://lists.netfilter.org/pipermail/netfilter-devel/2001-March/000717.html

Citing Gung So from that post:
| this will allow you to
| later move the protocol state around _without_ breaking the connection

A much more proper thing to do in Gung So's case is to use things 
like SHIM6.
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