Linking up two LANs on two routers

Technical Support for Routers
1

I have been working on two WANs (ISPs) but configuration on one router does not work.

So I am trying to work with two routers.

GL-AX1800 (192.168.8.0/24):
WAN: ISP-A

GL-AXT1800 (192.168.9.0/24):
WAN: ISP-B

I want:

  1. LAN will go through WAN of the same router, i.e.
    LAN on GL-AX1800 will go through WAN on GL-AX1800 (ISP-A) and
    LAN on GL-AXT1800 will go through WAN on GL-AXT1800 (ISP-B)

  2. clients on both LANs could access each others. i.e.
    192.168.8.x can access 192.168.9.x and
    192.168.9.x can access 192.168.8.x

Should I connect two routers with a cable LAN to LAN port?
How should be the configuration afterwards?

Thanks.

2

Connecting LAN to LAN will cause two DHCP server conflicts. It is okay if you will configure one of your router’s network devices using static IP.

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