VPN in DMZ help

Remote office location using Linksys EtherFast Cable/DSL VPN Router

Local office location using MS ISA as firewall/proxy for internal
clients.
ISA is configured tri-homed with external, internal and dmz.

I have a second Linksys EtherFast Cable/DSL VPN router sitting on the
dmz coming from the ISA.

I want the remote office Linksys and the local office Linksys to
establish an Ipsec tunnel through the ISA server.  Traffic then is to
pass from the remote office clients to the local office clients on the
internal network.

Linksys in remote office is configured with a public WAN IP and internal
IP of the network behind it, obviously.

Linksys in local office is configured with it's WAN IP as a DMZ adress
and an internal IP of the internal network.

How do I configure the ISA to pass the Ipsec tunnel traffic through to
the Linksys on either end - depending on where the connection is
originating from?

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