Depends. I believe gated etc will solve this, but it may be overkill. If you
have a small number of machines, or all of a subnet, behind D, you can simply
proxy arp for them at D (ie D responds to arp requests on behalf of the
machines behind it with its own hardware address and forwards the packets). As
far as machines A, B and C are concerned everything behind D appears to be on
the local net. All machines behind D use D as the default router. This is how I
handle my network at home living off a PPP connection a machine on the net at
work; the rest of the machines at work just see my machines as if they were
local, meaning I don't have to mess with the gateway at work. Works a charm.
Oh, all this assumes that A, B and C have all of D and the things behind it
covered by a route out the local interface.
David
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> Marc Roger
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