routing between two subnets using separate routers.

Hi,

This is the setup we have


( Internet )
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WAN interface
[Main router]
LAN port - x.x.x.238
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--------
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WAN port x.x.x.233 WAN port
x.x.x.234
[Subnet 1 router] [Subnet
2 router]
LAN port set to 192.168.1.0/24 LAN port set
to 192.168.2.0/24
--------
-----------------
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Hopefully that looks alright!

Basically there are 5 usable addresses assigned by the ISP - the
initial ADSL router picks up its WAN address via DHCP and this is a
variable address and can change with a new lease.

There is a subnet set up between the three routers using the subnet
supplied by the ISP.

This means that the two subnet routers are accessible to the internet
using their IP addresses - and this is what is needed to get VPN's
working.

What I need to know is very basic - what is the principle for being
able to access one subnet from the other - i.e. on 192.168.1.0 I
want to be able to access 192.168.2.0.

I thought it would be about adding static routes to the two subnet
routers but that does not seem to work - also I added static routes to
the main router but that did not work either.

If someone could point me at a known answer then at least I would be
trying to get the right idea to work.

Thanks,

Kevin