The router/firewall has a public IP on the Internet. The client is directly behind the router/firewall on a single, flat network (typically 192.168.1.0/24). In this situation, the client can VPN to the remote PIX/ASA/Cisco firewall even without NAT-Traversal enabled and everything works fine.
Mar 30, 2017 [SOLVED] Server 2016 RRAS, VPN, NAT - Windows Server Aug 02, 2019 Remote Secure Access VPN | Check Point Software
Oct 09, 2019 · set service nat rule 5004 description "masq to vpn vtun0" set service nat rule 5004 destination address 0.0.0.0/0 set service nat rule 5004 outbound-interface vtun0 set service nat rule 5004 type masquerade
UniFi - USG/UDM: Configuring L2TP Remote Access VPN However, if you add more specific routes to the client, for example 192.168.1.0/25 and 192.168.1.128/25, the client will start using the VPN. Using NAT on the USG/UDM to translate the ranges is not a workaround in this case, because the client is not even routing the traffic over the VPN. Fix Win NAT-T for L2TP and IKEv2 | Steven M. Jordan May 10, 2017
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May 14, 2018 · If the L2TP/IPsec VPN server is behind a NAT device, in order to connect external clients through NAT correctly, you have to make some changes to the registry both on the server and client side that enable UDP packet encapsulation for L2TP and NAT-T support for IPsec. Open the Registry Editor and go to the following registry key: The MX is not receiving the Client VPN connection attempt. Look at the event log page, using the filter Event type include: All Non-Meraki/Client VPN. Check whether the client's request is listed. If there is no connection attempt going through to the MX, it is possible that the Internet connection that the end user is on may have blocked VPN. If I sniff traffic on the Ethernet interface of the local client, I don't see it even attempting to send any ESP/NAT-T traffic to the remote VPN server; all I see are occasional IKE Informational messages with the Non-ESP marker exchanged between the client and server, and eventually, the server stops responding and the connection is dropped (i