This assumes that the network connectivity is already operational. But how to deal with this when it's not the case:
Our machine is an openvpn-gateway connected between our customer's infrastructure and our intranet. But, there is no dedicated line from our customer and us. So it goes through internet and our gateway is connected to internet directly with an ADSL card. So that the Mandos server should be somewhere in our intranet and the Mandos client will be installed on the machine.
Therefore, it becomes a bit more difficult because I can't encrypt all of my hard drive because I need ADSL credential for authentication with the ISP in clear text.