so I was hosting a server using NGINX on a Raspberry Pi using a T-Mobile mobile router. All was working fine, till I noticed today that T-Mobile started to put me behind a NAT sometimes. So I heard you can still access the server if you set up a VPN network, but I have no idea on how to do it.

To set up the VPN behind an existing firewall, you can use site to site VPN with aggressive mode and it's not necessary to do any NAT tranversal. In this case, for site SAN, you can configure the site as below. For site LOS, you can configure the site as following picture. Once the configurations are done, the VPN Tunnel will be up on both sides. You need to forward port 1194 (the default Openvpn port) on the main router to pfsense. After that you should be able to use the guide when connecting from outside your network I guess. Connecting from 10.0.0.x will require NAT loopback in the main router or split DNS. VPN behind NAT In that case, you would need to remove all the crypto map and disable isakmp configuration from the ASA. That port is already reserved on the ASA outside interface because you have those VPN tunnel configured earlier. Because ER-R is located behind a modem performing NAT services, the source IP address of the VPN ( is translated to the address. Choose either of the two following options to change the IPsec authentication IDs:

Issues with OpenVPN Server behind (non Linux) NAT

How to Install and Configure OpenVPN on Debian 9 – Linux Hint

May 13, 2020

It seems Google Cloud's VPS servers are behind NAT. So there is an internet facing ip address and also an internal ip address. Therefore, when I try to forward ports from external ip to OpenVPN's internal ip (10.x.x.x), it does not work because server is behind NAT and there is an internal ip. Is there a way to forward ports in this situation? Wireguard vs openvpn - Linux Forum - Spiceworks May 13, 2020 Re: OpenVPN server behind NAT Post by novaflash » Wed Aug 01, 2018 9:04 pm You probably didn't set the address that the clients should connect to in the 'host name or IP address' field in the Network Settings page of the Access Server. Feb 07, 2019 · NAT with OpenVPN Connections ¶ For many advanced NAT Scenarios using OpenVPN, assigning the interface is required as covered in Assigning OpenVPN Interfaces One common use of NAT with OpenVPN is to mask conflicting LAN subnets between two locations. Comparing to IPSec OpenVPN doesn't have any problem with NAT-T or number if concurrent sessions or even NetBIOS in case you want to use it. Good luck actions · 2006-Jun-12 10:29 pm · OpenVPN is a free, open source, general purpose VPN tool which allows users to build secure tunnels through insecure networks such as the internet. It is the ideal solution to a wide range of secure tunnelling requirements, but it is not always immediately obvious how it should be deployed in some circumstances. Recently, a correspondent