how to forward packets to another gateway, if i'm one

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Hi,
  I've spend some time searching Google on the topic, however 
eventually gave up. So..

  Is there any way of forwarding packets to another gateway, which, 
besides, is on the same network. Say, I'm on IP 10.0.0.2, and I act 
as a gateway (ADSL, really) for a number of machines on the same LAN. 
And there's another such gateway, hooked to another ADSL, which 
handles connections for another bunch of machines. Essentially the 
hosts 10.0.0.1 and 10.0.0.2 are identic and perform the same 
function.

  Now, I want to make some traffic that comes from some client and 
that should go through gateway 10.0.0.1 to be forwarded to 10.0.0.2 
(without any changes). The need is to make the forwarding transparent 
to both 10.0.0.2 and the client.

  So it's the way I suppose it should be done:
	a) No changes to be made 10.0.0.2's firewalling rules (in fact, it 
runs FreeBSD);
	b) Make 10.0.0.1 to forward them to 10.0.0.2 transparently. 

_This_is_the_culprit_. I don't know how to make them (packets) go 
that way. DNAT/SNAT doesn't suit, neither does REDIRECT, as they 
modify packets they filter.

	In FreeBSD, there's ipfw rule fwd, e.g. if 10.0.0.1 ran bsd, i'd 
type "ipfw add fwd 10.0.0.2 ip from some_client to any". I'm looking 
for the a way on how to make the same effect on Linux/iptables.
	Wrote to much of blurb. Guess I didn't mess it up too much :)

	Thanks. 
-- 
Saulius Menkevicius, razzmatazz@mail.lt on 12.06.2002





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