3Com 10014299 Enable/Disable Hiding Attribute Value Pairs AV, By default, AV pairs are hidden

616CHAPTER 43: CONFIGURING L2TP

Configure the Receiving

Window Size for

Controlling Flow over

Tunnel

By default, address pool 0 (the default one) will be used by the peer for allocating addresses.

When specifying the address pool from which addresses are allocated for users, the default address pool will be used for allocating addresses if no specific pool-number value is configured after the key word pool.

This configuration is applicable to LAC and LNS.

L2TP has simple flow control function. The users can specify the size of receiving window for controlling flow over tunnel.

Perform the following configurations in L2TP group view.

Table 683 Set the Size of Receiving Window for Controlling Flow Over Tunnel

Operation	Command
Set the receiving window size for	tunnel flow-control receive-window
controlling flow over tunnel.	size
Restore the receiving window size for	undo tunnel flow-control
controlling flow over tunnel to default	receive-window
value.

Enable/Disable Hiding

Attribute Value Pairs (AV

pairs)

By default, the receiving window size for controlling flow on tunnel is 0 (no flow control).

This configuration is used at the LAC and LNS sides.

L2TP enables hiding AV pairs, and it is very useful when PAP or proxy authentication is employed between LAC and LNS. Only after the tunnel authentication and tunnel password are configured first, can the AV pairs hiding be meaningful. After the AV pairs are hidden, the L2TP hiding algorithm will be implemented, so that the username and password transmitted in plaintext during proxy authentication can be encrypted in AV pairs.

Please perform the following configurations in L2TP group view.

Table 684 Enable/Disable Hiding AV Pairs

Operation	Command
Enable hiding AV pairs	tunnel avp-hidden
Disable hiding AV pairs	undo tunnel avp-hidden

By default, AV pairs are hidden.

In actual configuration, it is recommended to enable hiding AV pairs at LAC and LNS sides at the same time, or disable hiding AV pairs at LAC and LNS sides at the same time

Configure the Maximum This configuration is applicable to LAC and LNS.

Number of L2TP Sessions

Users can configure the maximum number of sessions at local end as needed, so as to effectively control the quantity of VPN users who are accessing the network simultaneously and keep it within a reasonable range. Thereby, the service quality