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Table 11-5 shows how the system matches the values in the clients' profiles as it receives
incoming calls and whether the system uses an existing tunnel or creates a new one:
Table 11-5.Tunnels created based on profile settings for incoming callers
Values used to match tunnel:
Address
1.1.1.1
1.1.1.1
1.1.1.1
1.1.1.1
1.1.1.1
1.1.1.1
1.1.1.2
Note: If a caller that does not supply a Client ID string that matches the tunnel-server end
point, so the existing tunnel to that end point (Tunnel-ID 102) is reused.
Configuration of the MAX as an LNS
When the MAX acts as a LNS, it responds to requests by LAC units to establish tunnels. The
LNS does not initiate outgoing requests for tunnels, so configuration of the MAX is simple.
Proceed as follows:
1
2
3
4
MAX 6000/3000 Network Configuration Guide
Client ID
Pri. Tunnel
Server
a1
a.example.com
a2
a.example.com
b
b.example.net
b
a.example.com
a.example.com
a2
b.example.net
a1
a.example.com
Open the Ethernet > Mod Config > L2 Tunneling Options menu.
Set L2TP Mode to either LNS or Both.
If you require tunnel authentication, set L2TP Auth Enabled to Yes.
You must configure both the LAC and LNS identically, to either require or not require
authentication.
Set L2TP RX Window to the number of packets that the MAX should receive before it
requests that the sending device stop transmitting packets.
The default is 7. Set the parameter to 0 (zero) to disable flow control in the receiving
direction. The MAX continues to perform flow control for the sending direction regardless
of the value of L2TP RX Window.
Setting Up Virtual Private Networks
Configuring L2TP tunnels for dial-in clients
Resulting action
Tunnel-ID
Reuse tunnel
102
Reuse tunnel
103
Establish new
104
tunnel
Establish new
105
tunnel
Reuse tunnel
102
Establish new
106
tunnel
Establish new
107
tunnel
11-43
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