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FS#3064 - Jumbo Frames not working on D-Link DAP-2695 with OpenWRT 19.07.2 #7832

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openwrt-bot opened this issue May 4, 2020 · 0 comments
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christian.exner:

Loss of functionality compared to OpenWRT 18.x

  • Device problem occurs on: D-Link DAP-2695 (Hardware Revision TBT)

  • Software versions of OpenWrt/LEDE: OpenWrt 19.07.2, r10947-65030d81f3

  • Steps to reproduce:

root@ap23:# ip link set eth1.2 mtu 1499
root@ap23:
# ip link set eth1.2 mtu 1500
root@ap23:~# ip link set eth1.2 mtu 1501
RTNETLINK answers: Result not representable

Since Upgrade-Installation OpenWRT 18.x to OpenWrt 19.07.2, r10947-65030d81f3 on D-Link DAP-2695 previously working Jumbo Frame config is no longer working.
On OpenWRT 18.x a max. MTU of 4071 could be set to Interfaces eth0 & eth1. On OpenWRT 19.07.2 a max. of 1500 ist possible.

MTU-Configuration in /etc/config/network seems to do just nothing (...but worked fine on OpenWRT 18.x)

MTU-Value set on commandline with "ip" command drops Message "RTNETLINK answers: Result not representable" if MTU-Value is set over 1500 Bytes. Command works fine if MTU-Value is 1500 and below.

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