IKEv2 (Internet Key Exchange Protocol Version 2) IKEv2, a protocol made available exclusively …

OpenVPN can run over User Datagram Protocol (UDP) or Transmission Control Protocol (TCP) transports, multiplexing created SSL tunnels on a single TCP/UDP port (RFC 3948 for UDP). [18] From 2.3.x series on, OpenVPN fully supports IPv6 as protocol of the virtual network inside a tunnel and the OpenVPN applications can also establish connections OpenVPN 2.0 expands on the capabilities of OpenVPN 1.x by offering a scalable client/server mode, allowing multiple clients to connect to a single OpenVPN server process over a single TCP or UDP port. OpenVPN 2.3 includes a large number of improvements, including full IPv6 support and PolarSSL support. If you have TCP connectivity problems on port 8080, try a different port - maybe port 1194/tcp which is the IANA reserved port for OpenVPN. If telnet does connect, TCP connectivity is probably ok and the problem could be in OpenVPN. You should improve your question by adding some OpenVPN logs. Jun 10, 2020 · Bottom line: UDP should be the main choice when using a VPN. In OpenVPN, you can choose either UDP or TCP connection types. Using IPsec and WireGuard, it is always UDP and can’t be changed. If you are connecting from a restricted network where protocols and ports are blocked, try OpenVPN over TCP ports such as 443, 80. Jan 18, 2019 · OpenVPN UDP packets have the DF(Don’t Fragment) flag set and should not be fragmented. A broken Path MTU as the result of a black hole if not handled properly, could cripple an OpenVPN UDP tunnel. When to use TCP Tunneling. When communication over UDP in your network is blocked

If you have TCP connectivity problems on port 8080, try a different port - maybe port 1194/tcp which is the IANA reserved port for OpenVPN. If telnet does connect, TCP connectivity is probably ok and the problem could be in OpenVPN. You should improve your question by adding some OpenVPN logs.

Jun 10, 2020

Using OpenVPN with TCP vs. UDP – Knowing the Difference

What is TCP and UDP? A simple explanation | NordVPN Nov 21, 2019