October 2002
Intermediate to advanced
206 pages
8h 30m
English
Content preview from RADIUS
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Name
Access-Challenge
Synopsis
|
Packet Type |
Response |
|
Code |
11 |
|
Identifier |
Identical to Access-Request |
|
Length |
Header length plus all additional attribute data |
|
Authenticator |
Response |
|
Attribute Data |
0 or more |
If a server receives conflicting
information
from a user, requires more information,
or simply wishes to decrease the risk of a fraudulent authentication,
it can issue an Access-Challenge packet to the
client. The client, upon receipt of the
Access-Challenge packet, must then issue a new
Access-Request with the appropriate information
included.
It should be noted that some clients don’t support
the
challenge/response process like this; in that case, the client treats
the Access-Challenge packet as an
Access-Reject packet. Some clients, however, do
support challenging, and at that point a message can be given to the
user at the client requesting the additional authentication
information—it’s not necessary in that
situation to set off another round of request/response packets.
Much like the Access-Reject packet, there are only
two standard attributes that can be included in an
Access-Challenge packet: the
State and Reply-Message
attributes. Any necessary vendor-specific attributes can be included
as well. The Reply-Message attribute can be
included in the packet multiple times, but the
State attribute is limited to a single instance.
The State attribute is copied unchanged into the
Access-Request that is returned to the challenging
server.
The Access-Challenge ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.