Bridged LAN - WAN

[Lee]

I wanting to put a hardware box with 2 nics to use just for VPN access from the internet. The default gateway has an internal address of 192.168.1.1, the DHCP server is 192.168.1.3. If the PSSence went in between can I just bridge the LAN and WAN interfaces and keep everything in the same subnet? or do I have put the default gateway into another subnet
Thanks
any help much appreciated

[Lee]

I have bridged the interfaces and it is running (with squid as well at the moment) not sure if the VPN will work but will give it a go