[OpenWrt-Devel] Fwd: 18.06 Bug: Baby Jumbo Frames on mt7621

Jaap Buurman jaapbuurman at gmail.com
Tue May 22 09:05:32 EDT 2018

Dear all,

The switch to the 4.14 kernel apparently broke the baby jumbo frames
support of 2048 bytes that the switch is capable off. I found out that
changing the mtu above 1500 via Luci no longer applies properly.
Trying to manually change the mtu via ssh also fails:

root at LEDE:~# ifconfig eth0 mtu 1508 up
ifconfig: SIOCSIFMTU: Invalid argument

If there is any additional information that I can supply, please let
me know. I am also more than willing to help test potential fixes :)

Yours sincerely,

Jaap Buurman

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