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My laptop's NIC went bad and I had to start using a USB Ethernet adapter. When I start up the computer, or even simply unplug and plug in the adapter, it gets two default gateways which show up in ipconfig: the router's IP address and 0.0.0.0.

Looking into this more, I did a route print and this showed up:

0.0.0.0  0.0.0.0  On-link  192.168.0.5  20
0.0.0.0  0.0.0.0  192.168.0.1  192.168.0.5  20

Searching the internet results in the majority of the blame being a service called "Bonjour" but I don't have that on my system.

If I can't find the root cause of the incorrect route, is there a way to change the metric for that 0.0.0.0 on-link route so it doesn't get used? I am new to Windows routing tables and I would like this to be persistent and I don't want to have to change things every time I connect to a different network.

Right now, my temporary solution is to run a command prompt and type in the following command, but I have to edit the gateway for every network I connect to. I also have to run this after every reboot, sleep, or disconnect of the USB Ethernet adapter.

route change 0.0.0.0 MASK 0.0.0.0 192.168.0.1

After more troubleshooting, I see the route to 0.0.0.0 default gateway being added when it gets the automatic private IP. It seems to assign itself a 169 address and 0.0.0.0 gateway too fast, before it gets the DHCP response and information.

Syntax42
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2 Answers2

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0.0.0.0 is the default route (the route used if there are no specific rues to affect the current traffic packet).

On-link as the gateway means that the route resolves locally.

The default route resolving locally may be happening due to installed network security software setting it to redirect traffic through its scanning engines.

Ƭᴇcʜιᴇ007
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Maybe you need to disable the built-in NIC in the bios, or disable the driver for it (you didn't specify what OS you are using).

Xavier J
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