GL-MT6000 (Flint 2) Multiwan failover mode (guest subnet conflict)

Routers
1

My Flint 2 runs fine. Usual business: routing the Internet from ISP, getting 192.168.0.10 from ISP's modem DHCP and serving local network under 192.168.8.0/24.

Unfortunately, there are problems with ISP so in the meantime I switched back on an old B535-333 4G router and plugged it to Ethernet 2 (switched from LAN to WAN in Network port management -> the manual needs to be updated). The 4G router gives 192.168.9.101 to eth2.
ISP's modem is still plugged to Ethernet 1 so that it takes over when ISP sorts out their mess.

I made sure the 4G router"s WAN port is pingable so the Flint 2 can see it. Then, I thought it would be enough to enable Multiwan failover mode and everything would be fine but it would have been too easy.

Too bad, I now get the following error

Guest subnet is in conflict with the WAN subnet, Please Change Guest Subnet to a different address.

on Ethernet 2's tab.

Any clue on what I do wrong here?

2

Change the Gateway of Guest Network to 192.168.10.1

Bruce_2025-06-25_10-34-50
Bruce_2025-06-25_10-34-501305×826 36.2 KB

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4

Thank you. I found out yesterday. I just changed the 4G router's default 192.168.8/255 to 192.168.9/255. I didn't remember that the guest network was also on 192.168.9.1. My solution was to move the 4G router's default network but yours is fine too.

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