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SIOCDELRT: No such process when deleting default route from secondary interface on Ubuntu

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reirab

I'm trying to remove the automatically-generated default route for a particular interface on an Ubuntu machine.

I have two interfaces, enp0s3 and enp0s8. Default routes are generated for each of them:

  Destination   Gateway         Genmask      Flags     Metric    Iface  
  0.0.0.0       10.0.2.2        0.0.0.0      UG        100       enp0s3
  0.0.0.0       192.168.137.1   0.0.0.0      UG        20101     enp0s8

I want all traffic other than a specific subnet to route to the 10.0.2.2 gateway and only one particular subnet (say, 10.1.2.0/24, for example) to the 192.168.137.1 gateway.

However, when I try to remove the default route on the enp0s8 interface, I get the following:

# route del 0.0.0.0 dev enp0s8
SIOCDELRT: No such process

How do I get rid of the default route for this secondary interface and replace it with a route to only the particular subnet that I want to route to that interface?

Note: There is also a route for 192.168.137.0/24 to the enp0s8 interface. I'm not trying to remove that one, just the default one.

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