Question about VPN configuration?

The address of either LAN does not need to be the same sub-net, but the end your VPNing into will need to be a static address, the important thing to remember is that you can set the LANs up to be whatever you want, but the important address is the IP supplied address, as this will be the one you will be logging into, and your router must allow VPNs and be set to direct the VPN to a specific device on the LAN, if you don't you may be seeing an address, but it has nothing to connect to.

You didn't say if you were setting up a VPN with a router or firewall product. In either case, it is most likely that the LANs on either end of the T-1 have different Sub-net addresses. As long as the SA's (Security Associations) have the correct information, the VPN should work just fine.

Try this link ( one of many ) for further information:

http://ftp.linux.org.uk/LDP/HOWTO/mini/IP-Subnetwo...

and, in particular, the bulleted section describing

Class C IP network numbers.

HTH.

wow, I can't believe you told the internet that info....