lorenz:

Device problem occurs on: TP-Link TL-WR841N/ND v10
Software versions of LEDE release: LEDE Reboot 17.01.4 r3560-79f57e422d / LuCI lede-17.01 branch (git-17.290.79498-d3f0685)

Steps to reproduce:

I configured a static IPv6 route as follows in /etc/config/network:

config route6
option interface 'lan'
option target 'fd99:827e:b43f:3000::/52'
option gateway 'fd99:827e:b43f:1040::5'
option metric '1'

However, that route does not get set up:

root@tikal-router:~# ip -6 route
fd99:827e:b43f::/48 from fd99:827e:b43f:1040::10 via fe80::4112:e572:86da:5d3b dev wlan0 metric 512
fd99:827e:b43f::/48 from fd99:827e:b43f:1040::/64 via fe80::4112:e572:86da:5d3b dev wlan0 metric 512
fd99:827e:b43f:1040::/64 dev wlan0 metric 256
fd99:827e:b43f:2010::/64 dev br-lan metric 1024
unreachable fd99:827e:b43f::/48 dev lo metric 2147483647 error -148
fe80::/64 dev br-lan metric 256
fe80::/64 dev wlan0 metric 256
unreachable default dev lo metric -1 error -128
ff00::/8 dev br-lan metric 256
ff00::/8 dev wlan0 metric 256
unreachable default dev lo metric -1 error -128