F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices VPN Configuration Guide-6PW100

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Item Descri
p
tion
Advanced
Configuration
Hello
Interval
Specify the interval between sending hello packets.
To check the connectivity of a tunnel, the LAC and LNS regularly send Hello
packets to each other. When receiving a Hello packet, the LAC/LNS returns a
response packet. If the LAC or LNS receives no Hello response packet from the
peer within a specific period of time, it retransmits the Hello packet. If it
receives no response packet from the peer after transmitting the Hello packet
for three times, it considers that the L2TP tunnel is down and tries to re-establish
a tunnel with the peer.
The Hello intervals on the LAC and LNS ends of the tunnel can be different.
AVP
Hidden
Specify whether to transfer AVP data in hidden mode.
With L2TP, some parameters are transferred as AVP data. You can configure
an LAC to transfer AVP data in hidden mode, so that AVP data is encrypted
before transmission for higher security.
This configuration is invalid on an LNS.
Flow
Control
Specify whether to enable flow control for the L2TP tunnel.
The L2TP tunnel flow control function is for control of data packets in
transmission. The flow control function helps in buffering and adjusting the
received out-of-order data packets.
Mandatory
CHAP
Specify user authentication on the LNS end.