19.4. Remote connection - IPsec and L2TP
Another common configuration is remote computer connections, such as a PC or mobile phone making a VPN (Virtual Private Network) connection
to a FireBrick. This is similar to a tunnel, but one end is a single device not a whole network.
The connection is made using IPsec in the same way as a tunnel, but then there is a further step using L2TP to further authenticate
the device. This uses PPP to set up IP addresses so normally means routing a single IP to the device, and a default route from the device.
Note
The configuration for this is not yet complete in the FireBrick. It will involve an IPsec configuration set up for a dynamic
far end, and for connection to L2TP. You then configure L2TP with local authentication (or using RADIUS) to set up the
L2TP level connection.
