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Chapter 4
Using Security Features
Using Remote Access Concentrator Server Tools for Windows NT
4-20
Fail-over Algorithm Process
The following table describes the fail-over algorithm process for
authentication and accounting.
When or If...
a user is to be authenticated,
an Access-Request packet is sent
to the RADIUS server,
the time expires,
the maximum number of retries
(10 by default) is reached without
a response from the server,
no response is received from the
backup server,
an accounting fail-over occurs,
the server remains the same until,
both the accounting primary
server and backup fail,
The...
RADIUS server first polled is specified
in the Server Tools Options dialog
box.
ERPCD/ACP waits the specified
timeout value (4 seconds by default)
for the response packet.
ERPCD/ACP retries the request.
attempt to authenticate against the
primary server fails and ERPCD/ACP
attempts to authenticate against the
backup server (if defined).
user is rejected.
failure of the backup server.
acp_logfile records RADIUS
accounting.
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