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Created about mtu (markdown)
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udp2raw introduces it's own header for encryption, anti-replay and multiplex. As a result you have to decrease the MTU at upper level to "make room" for the extra overhead. This is not only for udp2raw, this happens for almost all tunnels.
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Since udp2raw itself doesn't have user space packet splitter, you have to tune the MTU at upper level appliation (for example: openvpn, wireguard, kcptun) to make sure they don't send packet too large for udp2raw.
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However, if you are not happy with this or your upper level application doesn't allow you to tune MTU, there is indeed a way to by pass the MTU limitation, see [[https://github.com/wangyu-/udp2raw/wiki/bypass-mtu-limitation]]
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