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rjwood22's avatar
rjwood22
Aspirant
Feb 28, 2021

SSID sending odd addresses

Intermittently my appliances will be connected to my router with an address of 192.168.3.x. These connections will not get to the internet and occasionally I get a screen asking to login in to the service. 

My router normally assigns addresses 192.168.0.x. and these work fine. I checked my settings; starting IP: is 192.168.0.10; ending IP is 192.168.0.254 

How do I correct this issue with the wrong addresses being handed out?

Thanks,

Troubleshooting

3 Replies

  • antinode's avatar
    antinode
    Guru
    Mar 01, 2021

    > How do I correct this issue with the wrong addresses being handed out?

     

       First, determine who's handing them out?

     

       It's extremely unlikely that the DHCP server in your C3700 is
    dispensing IP addresses on multiple subnets.  Much more likely, there's
    some other gizmo in your neighborhood (on your LAN?) which is running
    another DHCP server on that other subnet.  That might be some
    Internet-of-Junk device which creates its own hotspot, with the intent
    of letting you (using a web browser or some special app) communicate
    with it, to allow you to configure it (so that it will use _your_
    wireless router, and disable its own).

     

       It's conceivable that some such IoJ gizmo has gone rogue -- lost its
    original configuration, or never had one, or just went nuts -- and is
    desperately crying out for help.

     

       In such a case, you might try disabling the radios in the C3700, or
    changing the SSID(s) on the C3700 and see if you still see the old
    SSID(s) (from the rogue gizmo).  You could also have some wired device
    which is running its own DHCP server.  As usual, many things are
    possible.  But the C3700 causing this on its own is among the least
    likely.

    • rjwood22's avatar
      rjwood22
      Aspirant
      Mar 01, 2021

      Thanks for your answwer.

      I tried to access the odd address this morning. It didn't respond. As I said this is an intermittent problem. I will have to wait for it to act up again and see if I can determine the gizmo causing the problem.

      BTW: the offending SSID is the same as my modem-router.

      Thanks again

      • antinode's avatar
        antinode
        Guru
        Mar 01, 2021

        > BTW: the offending SSID is the same as my modem-router.

         

           I figured that it must be, or else you wouldn't be talking to it.

         

           If the extra DHCP server is on a wireless device, then my guess (and
        it's purely a guess) is that some IoJ gizmo was previously informed of
        your router's SSID and passphrase, so that it could join your normal
        wireless network.  Then it got confused, and activated its own little
        hotspot, but remembered your normal credentials.

         

           The details of that hypothesis could be completely wrong, but the
        spurious/extra DHCP server is still my story, and I'm sticking to it.