Access remote host via a specific network interface

route.sh

#!/bin/bash

# SSH can access a remote host using a specified network interface
# just use -b with local address of that network interface
ssh -b 10.20.30.40 [email protected]

# add a route to a remote host via a specified network interface
sudo ip route add 12.34.56.0/24 via 40.30.20.10 dev wlp2s0
# delete a route in the routing table
sudo ip route delete 12.34.56.0/24

# see current routes
ip route show
route -n