R3303-HP HSR6800 Routers Security Configuration Guide

138
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure online Layer 3
portal user detection.
access-user detect type { arp |
icmp } retransmit number interval
interval [ idle-time idletime ]
Not configured by default.
NOTE:
A
djust the maximum number of transmission attempts and the interval of sendin
g
probe packets
according to the actual network conditions.
Configuring the portal server detection function
During portal authentication, if the communication between the access device and portal server is
broken, new portal users are not able to log on and the online portal users are not able to log off normally.
To address this problem, the access device needs to be able to detect the reachability changes of the
portal server quickly and take corresponding actions to deal with the changes. For example, once
detecting that the portal server is unreachable, the access device allows portal users to access network
resources without authentication. This function is referred to as portal authentication bypass. It allows for
flexible user access control.
With the portal server detection function, the device can detect the status of a specific portal server. The
specific configurations include:
1. Detection methods (you can choose either or both)
{ Probing HTTP connections—The access device periodically sends TCP connection requests to
the HTTP service port of the portal servers configured on its interfaces. If the TCP connection with
a portal server can be established, the access device considers that the probe succeeds (the
HTTP service of the portal server is open and the portal server is reachable). If the TCP
connection cannot be established, the access device considers that the probe fails and the
portal server is unreachable.
{ Probing portal heartbeat packets—A portal server that supports the portal heartbeat function
(only the IMC portal server supports this function) sends portal heartbeat packets to portal
access devices periodically. If an access device receives a portal heartbeat packet or an
authentication packet within a probe interval, the access device considers that the probe
succeeds and the portal server is reachable. Otherwise, it considers that the probe fails and the
portal server is unreachable.
2. Probe parameters
{ Probe interval—Interval at which probe attempts are made.
{ Maximum number of probe attempts—Maximum number of consecutive probe attempts
allowed. If the number of consecutive probes reaches this value, the access device considers
that the portal server is unreachable.
3. Actions to be taken when the server reachability status changes (you can choose one or more)
{ Sending a trap message—When the status of a portal server changes, the access device sends
a trap message to the NMS. The trap message contains the portal server name and the current
state of the portal server.