Ignore any connection to LAN2 and the modem GUI to start with.
Just connect the Modem DSL port to the phone line and LAN1 to the WAN interface on your APE. Make sure the APE has the logon details and DHCP enabled.
That is all you need to get the set-up working. You can then use the connection as usual.
ONCE YOU ARE WORKING AND HAPPY WITH IT.
Connect another Ethernet cable from LAN2 to a LAN port on the APE, leaving the Mac connected as usual.
Open a browser, and enter the address 192.168.1.1 - you should get a Huawei login screen, use admin for both Username and password. That will take you to a screen with various options and you can then find one with the basic connection stats - I don't have mine connected so cannot tell you which, again someone should be able to guide you.
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