Bind openvpn to one local IP

up.sh

#!/bin/sh

# From https://snikt.net/blog/2013/10/10/how-to-force-program-to-use-vpn-tunnel/

# Execute first :
# echo "10 custom_table" >> /etc/iproute2/rt_tables

# Put this in opvpn config :
# route-noexec
# route-up /home/p/route_up.sh

# Test with :
# wget --bind-address=$ifconfig_local http://ipecho.net/plain -O - -q; echo

echo "$dev : $ifconfig_local -> $ifconfig_remote gw: $route_vpn_gateway"

ip route add default via $route_vpn_gateway dev $dev table custom_table
ip rule add from $ifconfig_local/32 table custom_table
ip rule add to $route_vpn_gateway/32 table custom_table
ip route flush cache

echo "Test : wget --bind-address=$ifconfig_local http://ipecho.net/plain -O - -q; echo "

exit 0