Configuring Optional L2Tp Parameters; Configuring L2Tp Tunnel Authentication; Setting The Hello Interval; Enabling Session Flow Control - HP MSR Router Series Wan Access Configuration Manual

Configuring optional L2TP parameters

The optional L2TP parameter configuration tasks apply to both LACs and LNSs.

Configuring L2TP tunnel authentication

Tunnel authentication allows the LAC and LNS to authenticate each other. Either the LAC or the LNS can
initiate a tunnel authentication request. To implement tunnel authentication, enable tunnel authentication
on both the LAC and LNS, and configure the same non-null key on them.
To ensure tunnel security, enable tunnel authentication.
For the tunnel authentication key change to take effect, change the tunnel authentication key before
tunnel negotiation is performed.
To configure L2TP tunnel authentication:
Step
1. Enter system view.
2. Enter L2TP group view.
3. Enable L2TP tunnel
authentication.
4. Configure the tunnel
authentication key.

Setting the Hello interval

To check the connectivity of a tunnel, the LAC and LNS periodically send each other Hello packets. At
receipt of a Hello packet, the LAC or LNS returns a response packet. If the LAC or LNS receives no
response packets from the peer within the Hello interval, it retransmits the Hello packet. If it receives no
response packets from the peer after transmitting the Hello packet five times, it considers the L2TP tunnel
to be down.
To set the Hello interval:
Step
1. Enter system view.
2. Enter L2TP group view.
3. Set the Hello interval.

Enabling session flow control

This feature adds sequence numbers to transmitted packets and uses them to reorder packets arriving out
of order and to detect lost packets.
Command
system-view
l2tp-group group-number [ mode { lac
| lns } ]
tunnel authentication
tunnel password { cipher | simple }
password
Command
system-view
l2tp-group group-number [ mode { lac
| lns } ]
tunnel timer hello hello-interval
86
Remarks
N/A
N/A
Enabled by default.
By default, no key is configured.
Remarks
N/A
N/A
The default setting is 60 seconds.