Question: Can the 1GbE port on GL-MT3000 be reassigned as WAN?

Routers
1

Hello,

I have a question regarding the GL-MT3000 (Beryl AX) Ethernet port roles.

I understand that the 2.5GbE port can be switched between WAN and LAN using the main GL.iNet web interface (WAN/LAN convert), and that works correctly.

My question is specifically about the 1GbE port:

:backhand_index_pointing_right: Is it possible to use the 1GbE port as WAN instead of LAN?

I have tried changing the interface assignments in LuCI, for example configuring WAN → eth1 and LAN on br-lan, but after applying changes, the router either:

Loses WAN connectivity, or

The configuration is automatically reverted by the firmware after restart.

So I want to confirm whether this limitation is by design.

My specific questions:

  1. Is the 1GbE port internally connected to the SoC switch in LAN-mode only, making it hardware-locked as LAN?

  2. Is there any supported method to assign the 1GbE port as a true WAN interface that survives reboot?

  3. Or is the 2.5GbE port the only interface that can be used as WAN on this model?

Goal:

I simply want to confirm the hardware design to avoid trying configurations that are not supported.

Thank you very much.

— kienlevio

2

If you're comfortable using the command line.

uci set network.wan.device='eth1'
uci delete network.lan.device
uci set network.lan.device='eth0'
uci commit network && /etc/init.d/network reload

If you want to revert.

uci set network.wan.device='eth0'
uci delete network.lan.device
uci set network.lan.device='eth1'
uci commit network
/etc/init.d/network reload

Of course you may want to wait and see if the glinet staff will chime in with something easier, but this would be my ‘old school’ way of doing it just because I'm used to the shell and openwrt in general. I'm still learning the glinet webif myself.

1 Like
3

Since you’re using the Advanced LUCI GUI, the WAN to ETH1 part is fine, but instead of changing the LAN interface, leave it set to the ‘br-lan’ bridge, and select the Devices tab and configure the ‘br-lan’ bridge to uncheck ETH1 and checkmark ETH0 instead. Then save and apply.