Thx for answer Javier Amor Garcia
I'll try it soon
Your 1st answer is the easiest way for me for test
You could advertise the address of a gateway connected to Zentyal
The gateway (LAN ip of my FAI router inside my Zentyal's LAN) is configured by default in the Zentyal's Network > Gateway, and Activated button is selected.
I think it's ok, nothing more to do ?
However after that the clients should add manually the default route
I'll try to configure the network config on the client's openvpn network card without dhcp.
Humm, I think openvpn client needs a DNS server... I'll test with Zentyal's IP... why not, I think Zentyal will automatically redirect to the FAI dns server configured in Network > DNS
Will be back soon