Very helpful. Thanks.
Thanks carlos16, this is what I was looking for.
Is it normal than the eth2 (lan wan) of the WAN stay checked after Save and Apply ?
Or look into the forum for posts about gl inet ar150 where the user disabled one gmac and use only the other one to feed the switch that controls all the 5 Ethernet plug.
Ar150 is based on soc ar9331
Your router seems to use ar9341 !
Start from here
And ask to @psyborg he seems to be your man