How to add a route through a specific interface on FreeBSD (10 to 13)

If one day under FreeBSD (from 10 to 13 at least) you have a system with multiple IP addresses on the same network and you need to use a specific IP for a route, you have to use the -ifa parameter in the route command.

In our example, we have to use the address 192.168.1.140 to access the network 192.168.30.0 through the router 192.168.1.1, this is as easy as the following.

route add -net 192.168.30.0 192.168.1.1 -ifa 192.168.1.140

You can add this specific route like any other route in your rc.conf as usual, just add the -ifa X.X.X.X parameter.