Disable UDP protocol by default for OpenVPN tunnels
UDP protocol is useless if nothing is done to prevent fragmentation. Otherwise, it is at best unefficient. There exist routers on the internet that filter fragmented packets with specific data. This is hard to debug because TCP connections hang randomly when there is no OpenVPN encryption. Now, only TCP is enabled by default. A second protocol should be there for better performance when possible, either existing UDP one (provided it is guaranteed there is no fragmentation) or something better (GRE ?).
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