Permanent Branch Office VPN / WAN to LAN Routing

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I am trying to connect 2 x client PC's at our branch office via a permanent
router to router VPN connection. I basically require the 2 x client PC's to
act as if they were directly attached to our network at head office, with
full access to shared resources and so we can transfer files backwards and
forwards. Both offices have ADSL broadband and Static IP's.

We have SBS 2003 Standard with 2 x NIC's. Below is the network topology I
require to be implemented.

HEAD OFFICE BRANCH OFFICE

LAN
192.168.16.3/50 192.168.16.2
Clients<----------->Server<------>Router1<--INTERNET-->Router2<--->Clients x 2
WAN 192.168.0.3 192.168.0.2 192.168.3.2
192.168.3.3/15

I have the tunnel established between the 2 VPN Firewall routers so that bit
is OK.

The only ping I CANNOT make successfully is from 192.168.3.3 to 192.168.16.2.

This is basically because there is no route from the WAN side of the
network, to the LAN side of the network at head office.

Does some one know how to create this route from WAN to LAN, to allow access
for the remote clients?

Many of the other forums I have posted this connundrum in, just suggest to
remove the 2nd NIC. Doesn't this go against the ethos of SBS 2003?

Any helpful suggestions will be greatly appreciated.

Tony Y





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