Gateway to gateway VPN SBS ISA firewall

[ahayes1ic]

I intend to setup a gateway to gateway VPN using 2 DG834G ADSL routers to connect a remote and local site. The local site currently has a windows SBS 2003 server with ISA installed as the firewall for the internal network and the remote site is just a bunch of clients.

 

 

localclients --> ISA Firewall -->gatewayA --> internet --> gatewayB --> remoteclients

 

local clients have subnet 192.168.10.0 and remote clients have subnet 192.168.1.0

 

How do I allow local traffic from both sites through the ISA firewall while still protecting external traffic?

 

In this scenario is the ISA firewall needed at all?

 

Should I unstall it and rely on the gateway firewall?

 

It is such a comprehensive firewall and it would be a shame to uninstall if that is the case.

 

Any suggestions?

[PlausiblyDamp]

If the ISA boxes are currently being used as a firewall then you would need to configure them to allow traffic to / from the remote site's subnet.

 

Are the gateway devices also acting as firewalls and connected live to the internet?

[ahayes1ic]

If the ISA boxes are currently being used as a firewall then you would need to configure them to allow traffic to / from the remote site's subnet.

 

Are the gateway devices also acting as firewalls and connected live to the internet?

 

Only one ISA box at the local side.

 

I can setup the gateway on the local side to pass traffic through to the ISA firewall like a DMZ but how do I setup ISA to allow a whole subnet access?

 

Do I implement a firewall policy or a firewall filter or a static route in the routing and remote access server? Or maybe something else??