Extending network over S2S VPN

Hello.

If I want to extend a network, say 192.168.16.0/24 on two locations, how would that be done?

Meaning, I got a setup like this:

SITE1 (192.168.16.0/24) <-> ASG <-> S2S <-> ASG <-> SITE2 (192.168.16.0/24)

Then, devices at SITE2 should be able to access devices at SITE1 without much trouble.

I think a RED box can do this, but I cannot setup a RED box, as everything runs virtualized.

Is this possible to do with Astaro?

I know that a Cisco can do something like it.

Regards,
Frederik