In IPSEC, all critical information along with UDP/TCP header is encapsulated within ESP or AH header, ESP and AH itself is an protocol like TCP or UDP and carries no port information.If a NAT device is in between two IPSEC gateways and doing many to one NAT, it needs to do PAT(Port address translation) as well to maintain a consistent and proper session table. What is the Purpose of using NAT-T feature?. NAT-T is an IKE phase 1 algorithm that is used when trying to establish a IPSEC VPN between two gateway devices where there is a NAT device in front of one of the gateway devices or both the gateway devices. To overcome this problem, NAT-T or NAT Traversal was developed. Traditionally, IPSec does not work when traversing across a device doing NAT/PAT(Network Address Translation and Port Address Translation), meaning if either one of the devices or both the devices terminating IPSEC is behind a NAT device, IPSEC will not work. What is NAT-T or NAT traversal in IPSEC VPN?. NOTE: This article describes about NAT traversal taking tunnel mode and ESP protocol as an example, NAT traversal also supported in AH protocol and in transport mode. Copy URL The link has been copied to clipboard.Content Filtering Client Control access to unwanted and unsecure web content.

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