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

on Mastodon

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.