Dale, ignore the previous message. This one is the good one.
(Absolutely untested, but here it goes)
Mainly, you set both LANs with addresses that would fall into the same
net and use static routes at the gateways. The fact that the
communication is via an IP-IP tunnel is irrelevant. Working on your
diagram...
BEFORE
>
> LAN1 LAN2
> ==============| 10.42.2.131 10.75.78.221 |==============
> 10.42.250.0/24|--GW1-------------//-------------GW2--|10.75.250.0/24
> ==============| |==============
AFTER
LAN1 LAN2
==============| 192.168.2.1 192.168.2.2 |==============
10.42.250.0/8 |--GW1-------------//-------------GW2--|10.75.250.0/8
==============| |==============
Now, we set up the static routes:
In GW1: eth0 netmask 255.0.0.0 (like everybody else)
Anything to 10.75.250.0/24 (which would otherwise be local) goes
to tunl0
Anything to 10.255.255.0/24 (which would otherwise be local)
goes to tunl0
In GW2: eth0 netmask 255.0.0.0 (like everybody else)
Anything to 10.42.250.0/24 (which would otherwise be local) goes
to tunl0
Anything to 10.255.255.0/24 (which would otherwise be local)
goes to tunl0
Note I've tricked the gateways into thinking 10.255.255.something are
specific destinations, instead of broadcasts.
This version should work.
--
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