Forum Discussion

DaveAsp's avatar
DaveAsp
Joining in
6 months ago

Hub 5 DHCP giving wrong addresses to wired device

Hello,

Having just finished cabling my house and moving over to Virgin Media, I was looking forward to connecting various devices in various rooms via wired ethernet. To my horror, all the devices (TVs, Blu-Ray players, Xbox One) are receiving an IP address from DHCP from the Hub 5 in the 192.168.1.x range, whereas the Hub 5 only provides 192.168.0.x addresses. The default gateway shows as 192.168.1.1, but is not pingable because it doesn't exist, obviously.

Anyone any idea what's going on? It's definitely the Hub 5 doing this (have disconnected all other devices), and regardless, there are no other DHCP server devices on the network. It's happening on all ethernet ports and on all devices which I've tested so far. WiFi devices appear to be unaffected by this.

Thanks in advance.

  • Client62's avatar
    Client62
    Alessandro Volta
    6 months ago

    Note your computer needs to have an IP on the 192.168.1.xxx IP range to be able to ping another device on the same 192.168.1.xxx IP range.   If your laptop has e.g. IP 192.168.0.10 it can only reach hosts on the 192.168.0.xxx range.

    192.168.1.x range is typical for a xDSL Router from BT / PlusNet etc.

    Are the TVs, Blu-Ray players, Xbox One still hanging on to their last used IPs from before the switch over ? 
    Some devices need to be rebooted / power cycled to clear the last IP & start a fresh DHCP request.

    Are you 100% sure the previous xDSL Router is disconnected from the new LAN network ?

    Are these 192.168.1.xxx IP from a PI-Hole ad blocker or similar device that has DHCP server ?


    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Hi there,

      Thanks for the reply.

      Sorry, should have said that I work in the IT industry as an infrastructure engineer so I understand how DHCP & TCP/IP works.

      The devices in question haven't been connected via wired ethernet for years. Also, if I turn off DHCP on the Hub 5, then nothing on the network receives any IP address of any kind.

      I've also disconnected everything from the Hub 5 other than a solitary HP laptop, and still it gets a 192.168.1.x address. And I know, it doesn't make sense! 😞

      The Sky router has been returned to Sky as they wanted it back (God knows why!).

      Thanks again,

      David.

  • Adduxi's avatar
    Adduxi
    Very Insightful Person
    6 months ago

    Try a 60 second factory pinhole reset. Do NOT reboot the Hub, just let it do its own reboots etc. Also we have seen neighbours PLA’s giving DHCP across the mains even though it shouldn’t happen. 

  • legacy1's avatar
    legacy1
    Alessandro Volta
    6 months ago

    Maybe the hub is receive requests with a requested IP the device last used and the hub just goes OK😋  

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Haha! Good idea, although I've never used 192.168.1.x on any router previously, always been 192.168.200.x

  • Adduxi's avatar
    Adduxi
    Very Insightful Person
    6 months ago

    Any managed switches on the LAN that might be handing out DHCP ?  Just another random thought.,,,,,

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      A Netgear switch (don't laugh!) but with no DHCP capability.

      • legacy1's avatar
        legacy1
        Alessandro Volta
        6 months ago

        unplug the switch have the laptop to hub

  • Roger_Gooner's avatar
    Roger_Gooner
    Alessandro Volta
    6 months ago

    Was this hub in a QuickStart pack or installed by a tech?

    What does ipconfig /all say?

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Installed by VM engineers.

       

      C:\Users\david>ipconfig /all

       

      Windows IP Configuration

       

         Host Name . . . . . . . . . . . . : LT-xxxx

         Primary Dns Suffix  . . . . . . . :

         Node Type . . . . . . . . . . . . : Hybrid

         IP Routing Enabled. . . . . . . . : No

         WINS Proxy Enabled. . . . . . . . : No

       

      Ethernet adapter Ethernet:

       

         Connection-specific DNS Suffix  . :

         Description . . . . . . . . . . . : Intel(R) Ethernet Connection (6) I219-V

         Physical Address. . . . . . . . . : **:**:**:**:**:**

         DHCP Enabled. . . . . . . . . . . : Yes

         Autoconfiguration Enabled . . . . : Yes

         Link-local IPv6 Address . . . . . : fe80::bca:235f:e8ec:c74b%9(Preferred)

         IPv4 Address. . . . . . . . . . . : 192.168.1.108(Preferred)

         Subnet Mask . . . . . . . . . . . : 255.255.255.0

         Lease Obtained. . . . . . . . . . : 24 July 2024 10:06:43

        Lease Expires . . . . . . . . . . : 24 July 2024 12:06:43

         Default Gateway . . . . . . . . . : 192.168.1.1

         DHCP Server . . . . . . . . . . . : 192.168.1.1

         DHCPv6 IAID . . . . . . . . . . . : 113043759

         DHCPv6 Client DUID. . . . . . . . : **:**:**:**:**:**-**:**:**:**:**:**-DD-50

         DNS Servers . . . . . . . . . . . : 192.168.1.1

         NetBIOS over Tcpip. . . . . . . . : Disabled

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Job for tomorrow when at home and boss lady not WFH. Will need to reset SSID as had changed it from default, so not a 2 min job.

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Managed to do a soft reset from the web console and the issue remained. Performed a hard reset and everything appears to be worked as it should, for now 😁

      Have cancelled the engineer visit but will obviously keep an eye on this, just in case.

      Thanks to all who replied and offered assistance; much appreciated.

      Cheers,

      David.

      • Adduxi's avatar
        Adduxi
        Very Insightful Person
        6 months ago

        Just to note as well  VM would request you reboot your Hub at least once a week btw.  That's how stable they seem to be. It's all part of maintenance and good housekeeping......

  • Client62's avatar
    Client62
    Alessandro Volta
    6 months ago

    It would be interesting to know which version of Software on on the Hub 5, I ask because some of the early versions had DHCP failure when the SSID was changed from the factory values.

    Resetting the Hub 5 may cause it to revert to the factory Software ( I see this in Admin > Info on out Hub )

    Here is a potted history of the more common software versions :

    Hub 5 Firmware version : LG-RDK_4.6.24-2206.7    (seen prior to 2022)
    + Many reports of DHCP & Wi-Fi failures

    Hub 5 Firmware update : LG-RDK_6.9.22-2302.6    (seen from 26/07/2023 – pulled in days)

    Hub 5 Firmware update : LG-RDK_6.9.35-2302.6    (seen from 03/10/2023)
    + DHCP & Wi-Fi appear to be stable
    + Added ability to see the DOCSIS 3.1 Channel connection info.
    + Added ability to control brightness of panel lights

    Hub 5 Firmware update : LG-RDK_7.6.15-2306.5    (seen from 08/02/2024)
    +2.5Gb/s port no longer compatible with 2.5Gb/s unmanaged switches.

    • Tudor's avatar
      Tudor
      Very Insightful Person
      6 months ago

      I’ve been on LG-RDK_7.6.20-2306.5 for a couple of weeks now. This is the one that should fix the 2.5Gb problem. I’m in modem mode with my own router so I cannot confirm this.

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Here we go:

      Standard specification compliant : DOCSIS 3.1
      Hardware version : 1.1
      Software version : LG-RDK_7.6.20-2306.5
      Cable MAC address : **:**:**:**:**:**
      Cable modem serial number : YAXS13118669
      System up time : 5day(s)20h:19m:17s
      Network access : Allowed

  • Roger_Gooner's avatar
    Roger_Gooner
    Alessandro Volta
    6 months ago

    Surely it must have been working when installed by the tech.

    I can see from ipconfig /all that DNS Servers is 192.168.1.1 - which is certainly wrong.

    In IPv4 properties are both Obtain an IP address automatically and Obtain DNS server address automatically enabled.

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      Everything was working perfectly, but only this last week have I started to connect wired devices to the Hub 5.

      DHCP for WiFi works as expected; it's the DHCP for wired that's all messed up.

      Cheers.

    • DaveAsp's avatar
      DaveAsp
      Joining in
      6 months ago

      In IPv4 properties are both Obtain an IP address automatically and Obtain DNS server address automatically enabled? Yes, and the equivalent on the IoT devices. Thanks.

  • Client62's avatar
    Client62
    Alessandro Volta
    6 months ago

    Hub 5 performs DNS redirection for VM Smart Security ( controlled via the Connect app ), even blocking attempts to use a Public DNS or a DoT / DoH when Smart Security is enabled.

    Unlike earlier VM Hubs, Hub 5 does resolve  > nslookup hp.com 192.168.0.1