[Bug 280736] Packet size of EtherIP over IPv6 is limited to 1280 bytes.

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 280736] Packet size of EtherIP over IPv6"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 10 Aug 2024 17:17:28 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280736

--- Comment #1 from Kazuki Shimizu <kazubu@jtime.net> ---
In current implementation, IPV6_MINMTU is set in in6_gif_output and the
encapsulated EtherIP packet is fragmented to 1280 bytes even if underlying
network supports more than 1280 bytes MTU.
It is good for compatibility in small PMTU environments, however, performance
is degraded.

I think it's better to have an option for increase MTU size for EtherIP over
IPv6(Ethernet over gif).

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