Netgear Router Configuration Basic Keywords Defination

IPSEC pass through :  It is a technique for allowing IPSEC packets to pass through a NAT router. By itself, IPSEC does not work when it travels through NAT. Newer IKE and IPSEC implementations support NAT-Traversal which is a technique to detect NAT and switch to UDP encapsultion for IPSEC ESP packets.

PPTP passthrough addresses this by allowing VPN connections to traverse a NAT with ease. NAT (or more specifically PAT) can’t function without the use of ports.

NAT  enables private IP networks that use unregistered IP addresses to connect to the Internet. NAT operates on a router, usually connecting two networks together, and translates the private (not globally unique) addresses in the internal network into legal addresses, before packets are forwarded to another network.