NAT Traversal (NAT-T) - NAT Traversal (NAT-T) - strongSwan
Overview: Setting up IPsec to use NAT traversal on one side of the WAN. When you are using IPsec to secure WAN traffic, you can set up an IPsec tunnel with NAT traversal (NAT-T) to get around a firewall or other NAT device. This implementation describes how to set up the IPsec tunnel when you have a NAT device on one side of the tunnel. 11. Remote Access and the Importance of Nat-T with IPSec Sep 16, 2019 IPsec and NAT Traversal - Securing the Network in Oracle IPsec and NAT Traversal. IKE can negotiate IPsec SAs across a NAT box. This ability enables systems to securely connect from a remote network even when the systems are behind a NAT device. For example, employees who work from home or who log on from a conference site can protect their traffic with IPsec. Multiple L2TP/IPsec VPN clients behind a NAT device
hiding in amongst the acronyms. The two main gotchas are that the two main IPSec protocols have issues with most technologies that attempt to modify fields in the layer 3 and layer 4 headers.
How can I disable/enable NAT traversal in VPN settings NOTE: NAT traversal feature in SonicWall is a global settings, changing this settings will affect all Global VPN and site to site VPN policies, also note that enabling this feature will not have impact on normal VPN working even though IPSEC gateways are not behind NAT device but disabling this feature will have impact the VPN policies where The log shows "NAT Discovery : Peer IPSec Security Gateway
Multiple L2TP/IPsec VPN clients behind a NAT device
VPN — IPsec — NAT with IPsec Phase 2 Networks | pfSense