Unfortunately, Windows VPN Client is not capable of changing the target TCP port of VPN connection. I would recommend you to setup a second IP address on your CentOS box and assign different xl2tpd instances to different IP addresses instead of ports.
Nov 21, 2019 What ports does VPN use ? :: SG FAQ IPSec may also need ESP (Encapsulated security Protocol, IP protocol 50), and AH (Authentication Header, IP protocol 51) SSTP (Secure Socket Tunneling Protocol) VPN, a.k.a. SSL VPN - uses private key to encrypt data over a SSL connection port 443 TCP Note: may also use ports 465 (Secure SMTP), 993 (Secure IMAP), and 995 (Secure POP) OpenVPN Virtual private network - Wikipedia A virtual private network (VPN) extends a private network across a public network and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network. Applications running across a VPN may therefore benefit from the functionality, security, and management of the private network.
Set up and Add a VPN Connection in Windows 10 | Tutorials
Connect to a VPN in Windows 10 - Windows Help Apr 22, 2020 Ports used for VPN Protocols – IPVanish Our VPN service uses these ports for Firewall configuration: For OpenVPN, we allow connections via TCP or UDP protocols on ports 443 or 1194. The IPVanish software uses port 443; Both PPTP and L2TP need the PPTP & L2TP pass-through options in the firewall/router's management interface to …
Virtual private network - Wikipedia
Short guide to VPN port forwarding : What it is, How to do it Port forwarding is a technique used to enable incoming internet connections to reach your device when using a VPN. It is necessary because most VPNs use an NAT firewall to stop users falling victim to malicious incoming connections. This is a useful security feature, but it is unfortunately unable to distinguish between incoming connections you don’t want and those that you do. How to share a VPN connection through Windows using an Jun 09, 2020 What is Port Forwarding and Why Use it With Your VPN? Oct 18, 2019 VPN connection types (Windows 10) - Microsoft 365 Security