Hello, I'm wondering what the reason is that OpenVPN Community sets the default TUN-MTU to 1500 bytes, as seen here: https://github.com/OpenVPN/openvpn/blob/ed31cf2ab718d879615dea81e6a17d26537ab43a/src/openvpn/mtu.h#L70 In my understanding, because of the additional overhead that the VPN tunnel adds to the transmitted packages, the resulting packages on the link interface can be larger than 1500 bytes and willl not fit through a regular link. This should result in fragmentation which hurts the tunnel throughput.
So do the default settings assume that the VPN tunnel is built using a link that supports jumbo-frames? How does it make sense to expect a link with jumbo-frame-support when probably most OpenVPN connections will be made over the internet? Could somebody please explain to me, what the idea behind this decision was? I'm very interested in if I've overlooked something. Wouldn't it be more helpful to most OpenVPN users when the TUN-MTU is dynamically calculated based on the LINK-MTU which could default to 1500 (or even 1492 to support DSL/PPPoE internet connections)? Thank you very much! Marcus Wichelmann
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