The ThruLink High Capacity / High Capacity+ Encrypted Hardware VPN Transmission System from KBC Networks is a hardware Virtual Private Network (VPN) device that enables secure communications to be established over any standard, public or private IP network using AES, Blowfish or Camellia encryption up to 256 bit. ThruLink is a tunneling device that constantly monitors the parameters of the communications channel to ensure optimization of the available bandwidth. It performs behind firewalls, NAT devices and will not affect TTL, UPnP, VLAN information, broadcast, multicast or any other traffic. By enabling secure communications to be set up over public networks eg. the internet, ThruLink can eliminate the need for leased lines. The system is designed to be configured by non-specialist personnel and for rapid deployment with minimal set up and maintenance free operation.