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According to RFC 791, every internet module must be able to forward a datagram of 68 octets without further fragmentation. This is because an internet header may be up to 60 octets, and the minimum fragment is 8 octets. The maximum size of IP packets is 65535 bytes. The range of MTU values allowes for the MTU configuration parameter is 68 to 65535. Signed-off-by: nickcooper-zhangtonghao <nic@opencloud.tech> [blp@ovn.org changed this to just a documentation patch] Signed-off-by: Ben Pfaff <blp@ovn.org>