IP based routing on Openvpn on Openwrt

Installing and Using OpenWrt Network and Wireless Configuration
1

Hello,
I am using latest openwrt software on Dlink DIR2660 A1
I was able to activate expressvpn by openvpn settings. but need few help:

  1. Right now configuration has been done that vpn is strictly enforced. when i stop vpn service then the internet gets disconnected. this i want to remove.
  2. on my wan6 i need IP based VPN routing so that when devices connected to the wan6 only the devices mentioned will get VPN tunneling and others should be on normal.

Thank you.

2

Is IPv6 fully functional with OpenVPN e.g. if you browse to 'ipleak.net' from a client you get both ipv4 and ipv6 showing your remote location?

If so you can look into using pbr:
https://openwrt.org/docs/guide-user/network/routing/pbr