Netgate Discussion Forum
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Search
    • Register
    • Login

    Xfinity/Comcast Cable Modem - WAN Issue

    Official Netgate® Hardware
    4
    6
    1.1k
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • B
      BlackH0le
      last edited by

      Hi guys

      I have relocated to different place and they offer xfinity internet here

      I have a Motorola MB7621 cable modem that works prefectly with my Wireless router BUT i need the internet to pass through Netgate 7100 When I connect the ethernet from motorola to my Netgate 7100 IU WAN port it wont receive an IP address, I tried to change the port speed from auto (common issue when dhcp doesnt work) but still it wont get an IP. link is up and should be working

      in motorola modem interface there is nothing you could set, basically it shows status

      maybe I need to clone the mac address of motorola modem to netgate?

      Thanks 😊🙏

      S 1 Reply Last reply Reply Quote 0
      • S
        SteveITS Galactic Empire @BlackH0le
        last edited by

        @blackh0le said in Xfinity/Comcast Cable Modem - WAN Issue:

        maybe I need to clone the mac address of motorola modem to netgate

        Yes you can try that, or power cycle the Comcast router (or wait a while). In the past I've seen models get into that sort of state where it won't recognize a new router.

        Pre-2.7.2/23.09: Only install packages for your version, or risk breaking it. Select your branch in System/Update/Update Settings.
        When upgrading, allow 10-15 minutes to restart, or more depending on packages and device speed.
        Upvote 👍 helpful posts!

        1 Reply Last reply Reply Quote 3
        • N
          noemiebear
          last edited by

          In case of problems related to the device - just restart it and try to connect again. You can also forget about the "xfinitywifi" network from your Wi-Fi settings and connect to it again.

          1 Reply Last reply Reply Quote 0
          • B
            bgrader117
            last edited by

            I know this topic is old but I am having the similar issue. Motorola modem is set to IP6 only (cannot change it) and my netgate FW 2100 is not getting the IP4. I have rebooted my modem and netgate multiple times and nothing worked.
            Is this something I need to call Comcast/Xfinity to fix?
            If I bypass the netgate and connect my Linksys router directly with my modem (the old way) I am able to browse.

            S B 2 Replies Last reply Reply Quote 0
            • S
              SteveITS Galactic Empire @bgrader117
              last edited by

              @bgrader117 did you reboot the Comcast modem or power it off? (For like 30 seconds, and remove a battery if it has one)

              Pre-2.7.2/23.09: Only install packages for your version, or risk breaking it. Select your branch in System/Update/Update Settings.
              When upgrading, allow 10-15 minutes to restart, or more depending on packages and device speed.
              Upvote 👍 helpful posts!

              1 Reply Last reply Reply Quote 0
              • B
                BlackH0le @bgrader117
                last edited by

                @bgrader117

                Go to Xfinity Mobile App and Reset your Modem
                OR
                Press the PIN in Back of your Motorola for 20 Seconds

                What is your Netgate Device ?

                1 Reply Last reply Reply Quote 0
                • First post
                  Last post
                Copyright 2025 Rubicon Communications LLC (Netgate). All rights reserved.