Different external IPs addresses through one ethernet port

Configure VPN in VPN qube to connect tot 127.0.0.1:12345.
Listen for VPN connection in VPN qube:

socat TCP-LISTEN:12345,fork,bind=127.0.0.1 EXEC:"qrexec-client-vm sys-net user.adminvpn"

In sys-net forward connection from qrexec to VPN server 10.1.2.3 and VPN port 12345:

socat STDIO TCP:10.1.2.3:12345

Here is an example:

But it’s using old qrexec format so you need to change it to the new one. Like this for example: