*A 'Fully Loaded' FireBrick is required for L2TP features
*AAISP Data SIMS can be relayed on to your own L2TP Server, such as a FireBrick. This will enable a remote SIM to be connected directly to your LAN and have an IP on your LAN, very similar to a VPN.
*The Computer (or device) with the SIM will not need any special config or software installed.
*At the moment the L2TP tunnel is not encrypted, but this will change shortly.
*Basic setups can be done in the FireBrick config without the need to run your own RADIUS server - for each SIM connecting in you'll need a single <match .../> config.
*The FireBrick allocates IPs statically within the config and can't use DHCP - for more advanced and more flexible configurations you'd run your own RADIUS server.
On the WebUI, this is set under Tunnels, L2TP, Incoming L2TP connections, and basic XML example is as below:
<incoming name="MyL2TP" hostname="FireBrick" secret="myPassword" pppip="10.0.0.2" pppdns1="184.108.40.206" pppdns2="220.127.116.11" lcp-rate="25" lcp-timeout="240" tcp-mss-fix="true">
The settings explained are:
*name - Just a name for this
*hostname - the hostname used within the l2tp, this will be used later when setting up the AAISP SIM end.
*secret - the password (optional)
*pppip - the IP used as the PPP endpoint on the FireBrick - typically the FireBricks IP address
==Routing from the LAN==
If you are assigning IPs from your LAN to the SIM, then as the L2TP connection is on a different interface to your LAN -to enable routing from the LAN to your SIM you will need to set proxy-arp=true on the LAN interface.
[[File:Small-sim.jpg|frame|Data SIM ]]
At the AAISP end, AAISP will set up a 'line' on the control pages for your SIM, you can request Staff to set this for L2TP:
*Target IP - IP (4 or 6) of your FireBrick
*Host - The Hostname as set in your 'incoming' config, ie FireBrick in this case
On the Web interface, Status, L2TP will give the connection, if it's connected.
[[File:L2tp-sessions.png|border|SIM showing on L2TP sessions page ]]
Here there is no need to create a separate subnet interface on the FireBrick. This SIM then be accessible from your LAN and not your WAN, and the SIM will only have access to your LAN and not the WAN.
To give the SIMs access to the Internet, you will need a Route Override configured to NAT the traffic from the L2TP to your internet interface (in this case PPPoE), eg:
<route-override name="L2TP NAT">
<rule name="NAT the SIM for Internet Access" source-interface="l2tp" target-interface="pppoe" set-nat="true"/>