VPNLinux
From Amahi Wiki
VPN Client - Linux
The VPN client for Linux comes with the OpenVPN. It's invoked with a script.
This is the script to use (replacing XYZ for the nickname of the HDA you are trying to connect to):
remote XYZ.yourhda.com 1194 client dev tun proto udp resolv-retry infinite nobind persist-key persist-tun ca ca-cert.crt cert AmahiHDAClient.crt key AmahiHDAClient.key comp-lzo verb 3 auth-user-pass