What is the difference between LAN-to-LAN (or site-to-site) VPNs and host-to-LAN VPNs?
The LAN-to-LAN Virtual Private Networks are encrypted connections via Internet that connect geographically distinct networks. These connections are used by companies with offices dispersed territorially and the use of dedicated data communication links would be too expensive. The host-to-LAN VPNs instead connect individual clients in a encrypted manner to a LAN. This need is ever-increasing alongside the use of firewalls that block the external use of the most sensitive services within company intranet: by using host-to-LAN VPNs an employee who is off site can avail of all relevant intranet services as if physically connected. • What does VPN Passthrough and IPSec NAT-T mean? Often the protocol used to compose VPNs, for example IPSec, encrypts the payload of IP packets and authenticate them via a checksum on the header. A router that applies the NAT or PAT on packets must be able to inspect payload content, since the TCP/UDP ports are located here and are used to track connections in t
