Hello Urban,
> 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.
You can do this entirely in userspace. All you need is a divert socket.
See the manpage divert(4).
Björn Fischer
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