Although, question isn't clear, but I assume you have 2 subnets, connecting thru VPN, subnet1 UNIX machines are able to ping locally within subnet1 and same is the case with subnet2. But subnet1 machines aren't able to ping subnet2 machines thru the VPN, right?

At all UNIX machines at both subnets, add your default gateway:

Code:

route add default 192.168.0.100

Where 192.168.0.100 is the private IP address of your VPN device local to that particular subnet, also make sure that your VPN device allows packets from your local machines to pass thru. Sometimes it happens that every thing is configured properly but UNIX machine doesn't have access to internet or foreign IP address, check that also.

If it doesn't help, pls provide some more details.

Regards,
Tayyab