OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
  • Task Type Bug Report
  • Category Base system
  • Assigned To No-one
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Christian Exner - 04.05.2020

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

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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