NAT traversal refers to the common problem in TCP/IP networkingof establishing connections between hosts in private TCP/IPnetworks which use NAT devices

Client-based IPsec VPN connections often do not work when passingthrough a NAT device as the IKE and IPsec protocols were notdesigned to work through NAT. NAT Traversal is an add-on to the IKEand IPsec protocols that allows them to work when beingNATed.

NAT traversal is only used if both endpoints support it.

D-Link products that currently supportNAT traversal include

• DS-601/605 (D-Link VPN software)
• DI-804HV (from firmware 1.43)
• DFL-200/700/1100
• DFL-800/1600/2500