What is VPN pass-thru?
Virtual Private Networks are used to allow remote access to a private network. A computer connected via VPN to a working network will actually appear to be on that network and will have access to all it’s resources. VPN itself depends on complicated encryption to provide security. This encryption however typically conflicts with the NAT function of most routers. VPN pass-thru is a modification to NAT that allows VPN packets to traverse the router without being mangled, thus allowing VPN connections.