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NAT Traversal (NAT-T) » History » Version 2

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Martin Willi, 02.07.2007 15:20


NAT Traversal

IKEv1

IKEv2

The IKEv2 protocol includes NAT traversal in the core standard, but it's optional to implement. strongSwan implements it, and there is no configuration involved. The NAT_DETECTION_SOURCE/DESTINATION_IP notifications included in IKE_SA_INIT indicates the peers NATT capability and if a NAT situation is detected, UDP encapsulation is activated for IPsec.
strongSwan starts sending keep alive packet if it is behind a NAT router to keep the mappings on the NAT device in tact.