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FS#1502 - MT7621 - MTU > 1500 not supported (was previously) #6633
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mkresin: Would you build an image from my [[https://git.openwrt.org/?p=openwrt/staging/mkresin.git;a=summary|my staging tree]] an check if the issue is fixed. |
user3016863: May I know why max_mtu is limited to 2048? |
mkresin: I've no idea why the max mtu is limited to 2K frames. But neither I have hardware to test if 9k frames are working out of the box. |
user3016863: When I run a ping test between the devices, the MTU is actually limited to 2002 (2030 after adding 28). Any value above that will cause packet loss. Although max_mtu allows 2048 to be set, when I run |
dnshs: I'm unable to build an image, however the current 18.06.0-rc1 release still can't be set > 1500 |
jow-: The 2K MTU should work again, support for 9K MTU requires reworking in the ethernet code. Please continue discussions regarding 9K in FS#1595. |
dnshs:
Edgerouter X / Edgerouter X SFP running Trunk
root@OpenWrt:~# ifconfig eth0 mtu 1600
ifconfig: SIOCSIFMTU: Invalid argument
[ 109.619242] eth0: Invalid MTU 1600 requested, hw max 1500
This was supported previously on Reboot r4651-a6f6f8d
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