Can I use the VPN with a NAT device, residential gateway, and cable or DSL router?
Some may wish to purchase a NAT (Network Address Translation) device for connection to their ISP. This will allow several computers to connect to the Internet using one real IP address and network connection, (Cable Modem or DSL). The NAT Device has a real IP address. The computer(s) are then connected to a LAN created by the NAT device using a locally defined set of IP addresses, typically 192.168.0.x. The NAT device hosts these local addresses on the Internet permitting access. Computers on the Internet do not see the local addresses, only the real address of the NAT device, which in turn selects the correct computer on the local network. This may confuse the VPN client, as well as other services which us a defined set of protocol ports, if more then one connection is attempted. Most NAT devices will only support one VPN Client connection at a time. Refer to your NAT device manual for configuration details. The IPSEC Protocol suite uses: IPSEC-AH Authentication Header Protocol (UDP 3
