OpenVPN
This page describes setting up openVPN on an N900.
Server Setup
The server should be setup like so:
http://openvpn.net/index.php/open-source/documentation/howto.html
udp is better than tcp if you can use it. If your client is likely to be behind firewalls then tcp is more likely to work.
Consider whether compression is useful - if you're transferring media or using ssh tunnels then it may not gain much.
If you need access to a nameserver on your LAN you'll need this in the server.conf:
push "dhcp-option DNS 10.0.0.7" push "dhcp-option DOMAIN dgreaves.com"
Client Setup
You'll need the openVPN client and the openVPN applet
Create a matching client setup conf and copy it together with the client certificate, key and the ca file to the /etc/openvpn/ directory on the device.
The client.conf may need:
# Allow scripts to be run script-security 2 # and update the config when a route changes up /etc/openvpn/maemo-update-resolvconf plugin /opt/openvpn/lib/openvpn/openvpn-down-root.so "script_type=down /etc/openvpn/maemo-update-resolvconf"
The applet will pickup any .conf files in that directory.