OpenVPN MTU: Finding the Correct Settings
Finding correct OpenVPN MTU and MSSFIX settings can really drive you batty. No really. It’s ridiculous how much trouble MTU settings can cause and how often people don’t realize that MTU is actually what’s causing the problem!
Read more: https://www.thegeekpub.com/271035/openvpn-mtu-finding-the-correct-settings/