Configuring Portal Detection Functions; Configuring The Portal Server Detection Function - HP 12500 Series Configuration Manual

Step
1. Enter system view.
2. Specify an automatic
redirection URL for
authenticated portal users.
NOTE:
To use this feature for remote Layer 3 portal authentication, the portal server must be an IMC portal server
that supports the page autoredirection function.

Configuring portal detection functions

Configuring the portal server detection function

During portal authentication, if the communication between the access device and portal server is
broken off, 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 timely 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 switch (access device) can detect the status of a specific
portal server. The specific configurations include:
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,
that is, 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
(currently only the portal server of IMC 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.
• 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.
Actions to be taken when the server reachability status changes (you can choose one or more)
•
Command
system-view
portal redirect-url url-string
[ wait-time period ]
116
Remarks
N/A
By default, an authenticated user is
redirected to the URL the user
entered in the address bar before
portal authentication.
The switch does not support the
wait-time period option.