Does this work for your setup, VLAN configuration WAN port (GL-AX1800 Flint) - #3 by hansome
I don’t think think use pppoe and static proto work at the same time.
Only keep,
config interface ‘wan’
option hostname ‘GL-AX1800-d40’
option metric ‘10’
option proto ‘pppoe’
option username ‘[email protected]’
option password ‘my_isp_password’
option disabled ‘0’
option ifname ‘eth0.900’
option ipv6 ‘0’
and VLAN900 should be removed.