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Network Address Translation-Traversal (NAT-T) is a method for getting around IP address translation issues encountered when data protected by IPsec passes through a NAT device for address translation. Any changes to the IP addressing, which is the function of NAT, causes IKE to discard packets. No special configuration on the NAT device is required. You need no permission by your network administrator of the NAT. The built-in NAT Traversal Function opens a "Punched Hole" on the NAT or firewall. When the VPN Client or VPN Bridge attempts to connect to your VPN Server behind the NAT, the connection packets will be lead through the hole. Mar 28, 2019 · A VPN, or Virtual Private Network, encrypts a device’s internet traffic and routes it through an intermediary server in a location of the user’s choosing. Because all internet traffic is “tunneled” through the VPN before reaching the internet, the NAT firewall on your wifi router can’t distinguish between requested and unsolicited Jan 17, 2014 · The VPN router is behind a NAT device that translates its VPN interface using PAT. The configuration on our ASA remains the same (the configuration we did for main mode). We will translate the Fa0/0 interface (192.168.12.2) on the VPN router to the Fa0/0 interface IP address of the NAT router (10.0.0.2). VPN with NAT-T. If one side of a planned VPN tunnel is behind a NAT (network address translation) firewall, the setup of your tunnel requires the following specifications: Each side of the tunnel must use both a Local Identity and a Remote Identity. These must match the identities on the other side: The Local Identity must match the Remote
What is NAT-T ? What is use in Site to Site VPN with NAT
Configure NAT for VPN Traffic Jul 17, 2018 configuration_guide_for_vpn - TP-Link
*Normally* if the VPN client supports autodetection, it will try to connect without NAT-T and if there's no response (because the client's proxy/firewall/router is rejecting the ESP packets), it will try to renegotiate the connection with NAT-T (encapsulated ESP in UDP over port 4500).
L2TP/IPsec Windows 10 Setup Instructions for Giganews