[LARTC] transparent PAT

[Nickola Kolev <nikky@mnet.bg>]

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Hello, everyone!

I would like to solve the following problem. Btw, I'm terribly
sorry about the pseudo-asciiart, but that's all I can paint as
a tropology. I'm hoping it'll be enough.

----Internet----
	|
	|
	|
	eth0
	machine A
	routing+ipchains
	eth1
	|
------------------ machine B

So, given I'm running kernel 2.4.19 and using ipchains (don't
ask me why, but I'm bounded to this config), I would like to
reroute everything that's passing thru eth1 on machine A 
from the internal lan and has dport XXXX to the same port
on machine B. The hole thing has to be completely transparent.
I tried some "advanced routing" stuff, like marking those packets
with fwmark and building a separate routing table for them,
but alas. Notice that the two machines are on the same LAN segment.

I've already tried also some userspace solutions, which didn't
work, like redir, tircproxy, transproxy, etc. but they didn't 
work either, complaining abount not able to bind to non-local
port. And yes (mr. Brown), I know about the 
/proc/sys/net/ipv4/ip_nonlocal_bind switch, listed in
plorf.net/linux-ip/.

Any suggestions (or help) are very much welcome.

10q for your time,
Nickola

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