Add an "on-link" routing entry
Solution 1:
You need to put 0.0.0.0 in the gateway entry to create an "on-link" route.
For example, enter the following command in cmd.exe or bash:
route add 10.10.10.100 mask 255.255.255.0 0.0.0.0
Solution 2:
You can add an interface using the command
route add 10.10.10.100 mask 255.255.255.0 0.0.0.0 IF <26>