Probably, this is the n-th topic about Split VPN configuration, but I have read a lot without success so far.
I have a home router with OpenWRT and OpenVPN package. My ISP only provides IPv6 connection, so the IPv4 traffic is redirected through a DS lite tunnel over IPv6.
If I check my IP (ipleak.net) I can see an IPv4 address, an IPv6 one and IPv4+IPv6 DNS. IP and DNS are correctly passed by the ISP.
I also have two local networks, say LAN_A and LAN_B. LAN_A has IPv4+IPv6 support and LAN_B is IPv4 only. I would like LAN_A to be connected directly to internet, while LAN_B is only accessing internet through VPN (always on tunnel).
I have a commercial VPN provider and I have configured the client with the provided ovpn file.
When the tunnel is not present, everything works as expected. Once I open the VPN tunnel, all the traffic gets redirected to the VPN tunnel (as expected). 128.0.0.0/1 and 0.0.0.0/1 routes are added and DNS from the VPN server are also fetched.
I have implemented a split tunnel by following this guide: https://medium.com/@ingamedeo/openvpn-s ... 302a1a4e12 Basically, route-up is added to the ovpn config and the linked shell script removes the 128.0.0.0 and 0.0.0.0 entries and add routes of LAN_B towards the VPN tunnel.
When I open the VPN connection:
- LAN_B connects as expected to the VPN and internet. Since the VPN service provider does not offer IPv6 connectivity, everything is passing through IPv4 and I do not see any leak (DNS are correctly set and IPv6 is not available on LAN_B).
- LAN_A connects to the internet directly, but IPv6 is not available anymore (if I go to ipleak.net I see that IPv6 IP is now mising). Moreover, DNS are not those from the ISP anymore (when tunnel is not present) but those of the VPN provider.
How can I configure the system to let LAN_A get an IPv6 address and use my ISP's DNS, while keeping LAN_B IPv4-only with DNS priovided by the VPN server?
P.S. I tried to ask ChatGPT as well, without success
Thank you!