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What is my modems IP?

Nonamegame

So my cable modem is connected to the Sophos XG firewall that acts as the router. I use 192.168.168.x for my internal network and .1 is my router/XG. What is the IP for my cable modem? Is there an easy way to find this? I assume I would have to create a firewall rule to access the web admin page of my modem but first I need to find its IP. Confused!!



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  • 0

    Your cable modem IP should be listed here:
    Configure -> WAN Link Manager -> IPv4 Gateway -> IP Address

    It will likely be on a different subnet.  To access it from your network you'll need to add an alias for your WAN port that is the same subnet as your modem.  You can do that here:
    Configure -> Interfaces -> Add Interface -> Add Alias "select the external WAN port"

  • 0 in reply to Casual_User

    I can't seem to get this to work. Like the OP, I have a cable modem connected to my Sophos XG box (4 port Qotom device). When I check under 'Network' -> 'WAN link manager', it shows the cable modem with an IP address of 69.102.121.1, with the Interface IP address being my external IP address which also starts with 69.102.122.34 (IP address are not my actual IP addresses but hopefully explains what I'm seeing).

    My LAN address is 172.16.16.X.

    If I connect directly to my cable modem, I can access the web interface using 192.168.100.1.

    I've tried adding an alias as described on my WAN port, but still unable to access it. I've tried both 69.102.121.2, 192.168.100.2 and 172.16.16.2.

    I guess I'm still confused what the local IP address is for my cable modem attached to my WAN port (the 69.XXX.XXX.X isn't a LAN address, so I'm assuming that's probably my ISPs gateway address?).

  • 0 in reply to shred

    Well, I tried accessing my Motorola Surfboard cable modem again this morning on 192.168.100.1 and it worked. I did not have to setup any alias. Not sure what changed but I had no luck yesterday. So for anyone with the same modem and setup, it appears you don’t need to create an alias to access the modem web UI. Just try again on a different day I guess.... makes no sense.

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  • 0 in reply to shred

    Well, I tried accessing my Motorola Surfboard cable modem again this morning on 192.168.100.1 and it worked. I did not have to setup any alias. Not sure what changed but I had no luck yesterday. So for anyone with the same modem and setup, it appears you don’t need to create an alias to access the modem web UI. Just try again on a different day I guess.... makes no sense.

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