Title: How to add a route through a specific interface on FreeBSD (10
       to 13)
       Author: Solène
       Date: 02 May 2016
       Tags: freebsd networking
       Description: 
       
       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.