{"id":391,"date":"2010-03-23T11:10:19","date_gmt":"2010-03-23T11:10:19","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2010\/03\/23\/what-is-nat-t\/"},"modified":"2021-07-24T18:49:58","modified_gmt":"2021-07-24T18:49:58","slug":"what-is-nat-t","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Networking\/Terms-and-Concepts\/what-is-nat-t.html","title":{"rendered":"What is NAT-T ?"},"content":{"rendered":"
NAT-T (NAT Transversal) allows for IP-ESP packets to transverse devices which introduce NAT.
The problem with IPSec is that it uses the IP-ESP protocol naively. The ESP protocol doesn’t have “port-numbers” like TCP and UDP so NAT does not know how to translate the traffic because NAT\/PAT is based on port numbers.<\/p>\n
With NAT-T the ESP packets are encapsulated within UDP packets (normally UDP\/4500). Now that the packets are UDP based the NAT device can correctly NAT the traffic due to being to change the port numbers due to having the required packet headers.<\/p>\n","protected":false},"excerpt":{"rendered":"
NAT-T (NAT Transversal) allows for IP-ESP packets to transverse devices which introduce NAT.The problem with IPSec is that it uses the IP-ESP protocol naively. The ESP protocol doesn’t have “port-numbers” like TCP and UDP so NAT does not know how to translate the traffic because NAT\/PAT is based on port numbers. With NAT-T the ESP … Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"yoast_head":"\n