Ghost appearing of DHCP option 121 assigned routes

Michael Forum 0 Reputation points
2024-05-02T11:18:05.4333333+00:00

Hi

When connected to my office network DHCP server will assign option 121 three different networks to be reached using a router which is nor the default gateway. This works absolutely, the netwoks appears in my router table, in active routes. It does NOT appear as persistent routes.

Everything works, networks are reachable.

The problem is: sometimes when i boot my pc without a network connection, no ethernet cable, no WiFi the routes appear, also, when connected to other networks, with different DHCP server the routes also appears. In both scenarios I can do a "route delete" whch clears the route in question.

Has anybody similar experience, and if, is there a way to fix this issue ?

Thank you

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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Windows 10 Network
Windows 10 Network
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Network: A group of devices that communicate either wirelessly or via a physical connection.
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  2. Wesley Li 6,190 Reputation points
    2024-05-08T13:39:12.5333333+00:00

    Hello

    This is indeed an unusual behavior, and here are some suggested solutions to this problem:

    Check DHCP client Settings:

    Make sure the DHCP clients in your operating system are configured correctly and are not incorrectly requesting or caching these routes.

    In Windows, you can check the DHCP Settings of your network adapter by Changing Adapter Options in the Network and Internet Settings.

    Router configuration:

    Check your router configuration to see if there are any Settings or scripts that might cause routes to be automatically added under certain conditions.

    Try updating your router's firmware to the latest version to see if that fixes the problem.

    Custom scripts or policies:

    If your operating system or network environment uses custom scripts or policies to manage routes, check whether these scripts or policies may add routes at inappropriate times.

    Conflicts between static routes and DHCP routes:

    If you use both static and DHCP assigned routes on your network, make sure there is no conflict between them.

    Third-party software or drivers:

    Check for any third-party network management software or drivers that may affect routing table updates.

    Network monitoring and logging:

    Check the system and network logs for any error or warning messages related to route addition.

    If none of the above methods solve the problem, you need to use network monitoring tools to capture and analyze network traffic to better understand how routes are added to the routing table.

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