[Bug 260260] igb(4) I35{0,4} parrent <--> vlan jumbo frame mtu mismatch

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 15 Apr 2023 13:10:57 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260260

--- Comment #9 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
It's also worth mentioning, that large UDP datagrams are received fine without
any workaround, though the frames are shorter, at least in the case of testing
with iperf3.

UDP:
15:00:45.609781 ac:1f:6b:02:aa:bb > ac:1f:6b:02:aa:cc, ethertype IPv4 (0x0800),
length 9002: (tos 0x0, ttl 64, id 34971, offset 0, flags [none], proto UDP
(17), length 8988)
    192.168.40.3.49459 > 192.168.40.5.5201: [udp sum ok] UDP, length 8960

TCP:
 14:27:36.269125 ac:1f:6b:02:aa:bb > ac:1f:6b:02:aa:cc, ethertype IPv4
(0x0800), length 9014: (tos 0x2,ECT(0), ttl 64, id 0, offset 0, flags [DF],
proto TCP (6), length 9000)
    192.168.40.3.25218 > 192.168.40.5.5201: Flags [.], cksum 0x1a28 (correct),
seq 835179525:835188473, ack 1, win 70, options [nop,nop,TS val 2309578650 ecr
1068877401], length 8948

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