Routing configuration to use the VPN for VPN stuff, and default gateway for everything else

router.sh

#!/bin/bash

VPN_DEVICE=utun0
VPN_NETWORK=10
DEFAULT_GATEWAY=192.168.1.1  # home

host_exceptions=(
  xxx.xxx.xxx.xxx  # Some public service that needs to be accessed from the VPN 
)

sudo route -nv add -net $VPN_NETWORK -interface $VPN_DEVICE

for exc in ${host_exceptions[@]}
do
  sudo route -nv add -host $exc -interface $VPN_DEVICE
done

sudo route change default $DEFAULT_GATEWAY