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https://community.cisco.com/t5/security-documents/how-does-nat-t-work-with-ipsec/ta-p/3119442
Otherwise, no UDP encapsulation is done. But, IPSec Over UDP, always encapsulates the packet with UDP. NAT-T always use the standard port, UDP-4500. It is not configurable. IPSec over UDP normally uses UDP-10000 but this could be any other port based on the configuration on the VPN server.
https://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_dplane/configuration/15-2mt/sec-ipsec-nat-transp.html
Mar 30, 2012 · The IPsec NAT Transparency feature introduces support for IP Security (IPsec) traffic to travel through Network Address Translation (NAT) or Port Address Translation (PAT) points in the network by addressing many known incompatibilities between NAT and IPsec.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_vpnips/configuration/12-4/sec-sec-for-vpns-w-ipsec-12-4-book/l2tp-ipsec-sup-nat-pat-win-clients.html
Jul 21, 2017 · The L2TP IPsec Support for NAT and PAT Windows Clients feature allows more than one Windows client to connect to a Layer 2 Tunneling Protocol (L2TP) Network Server (LNS) at one time with IP Security (IPsec) enabled and a network address translation (NAT) or port address translation (PAT) server between the Windows client and LNS.
https://docs.netgate.com/pfsense/en/latest/vpn/ipsec/ipsec-nat-t-support.html
IPsec NAT-T Support¶ Yes, NAT Traversal for IPsec (NAT-T) is supported in all current versions. It is configured on the Phase 1 options for an IPsec tunnel.
https://searchnetworking.techtarget.com/tip/IPSec-and-NAT-incompatibility
Aug 01, 2006 · Learn why Authentication Header (AH) doesn't work with Network Address Translation (NAT) or Port Address Translation (PAT) and that Encapsulating Security Payload (ESP) is also incompatible with PAT. ... IPSec and NAT incompatibility. Learn why Authentication Header (AH) doesn't work with Network Address Translation (NAT) or Port Address ...
https://docs.citrix.com/en-us/netscaler/12/netscaler-support-for-telecom-service-providers/lsn-introduction/lsn-configuring-alg/configure-ipsec-application-layer-gateway-for-large-scale-nat.html
Sep 17, 2018 · NAT-Traversal (NAT-T) capable IPSec endpoints detect the presence of an intermediate NAT device during IKE phase 1 and switch to UDP port 4500 for all subsequent IKE and ESP traffic (encapsulating ESP in UDP). Without NAT-T support on the peer IPSec endpoints, IPSec protected ESP traffic is transmitted without any UDP encapsulation.
https://support.microsoft.com/en-us/help/926179/how-to-configure-an-l2tp-ipsec-server-behind-a-nat-t-device-in-windows
May 01, 2019 · By default, Windows Vista and the Windows Server 2008 operating system do not support Internet Protocol security (IPsec) network address translation (NAT) Traversal (NAT-T) security associations to servers that are located behind a NAT device.
https://community.openvpn.net/openvpn/wiki/DoesOpenvpnSupportIpsecOrPptp
Historically, one of IPSec's advantages has been multi-vendor support, though that is beginning to change as OpenVPN support is beginning to appear on dedicated hardware devices. While the PPTP protocol has the advantage of a pre-installed client base on Windows platforms,...
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