Hi all,

I have a question regarding modification of a FreeBSD gateway (the Internet
gateway for a LAN). What I want to do is to have the gateway pick up the
packets, modify the IP-header and resend the packet onto the network. This
is a little bit like a NAT but I want to be able to do it differently and on
my own terms. I guess that this means that I would be forced to rewrite the
gateway source-code so it behaves as I want it to. So the problem now is
that I donīt really know where to start. If anyone out there has some
suggestions on how to start, which files to modify and so on I would be
grateful. As far as I know there might already be some code out there that
does the very thing I want. In that case, feel free to share the knowledge.

regards Urban

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