RE: [Emerald] Revelation

Brandon Bryant ( )
Mon, 21 Dec 1998 14:00:20 -0500

OK.. Then here is another question for you. How difficult is it to set up
replication for two SQL servers? I am reluctant to point both radius
servers to the same SQL server. Right now, the primary radius and the
primary SQL are the same machine, and the secondary radius and the
secondary SQL are the same machine. If the Primary radius server goes
down, chances are the db is down too. I guess we could have one db server
and point two other servers running radius to that one, and then have even
another machine running a backup DB, and then use the multiple DSN feature
on Radius to switch to the backup DB when there is a problem with the
first. Does (will) RadiusNT have the multi-DSN feature? I know it has
been discussed on the list before but I never really saw whether or not
this feature will do what I want it to here.

I'm trying to keep my point of failure as far back as possible. If the
server goes down at 2AM, I don't want to have change anything to get
service back up.

-----Original Message-----
From: Dale E. Reed Jr. []
Sent: Monday, December 21, 1998 12:48 PM
Subject: Re: [Emerald] Revelation

Brandon Bryant wrote:
> I ran into an interesting situation that I was wondering if anyone else
> seen.
> We have two Ascend Maxes and two radius servers running RadiusNT. In the
> MAX setup, I set the primary auth server and the secondary auth server
> accordingly.
> Now, what is happening is when the primary goes down or is unavailable,
> MAX switches to the secondary. Then never switches back to the primary.

This is the default behavior of the MAX. The RADIUS RFC does NOT
the NAS to always try first the primary server. In fact, the idea of a
primary/secondary server is a Livingston idea that most people copied.
Ascend, suprise, uses the one the is responded the best. Until the
RADIUS server has a problem, it will not switch back.

> So, we replicate our db at night from primary to secondary. So any
> we make to the db during the day is null and void if the server was down
> before. It was driving us nuts until I figured that out over the
> I'm going to start a ticket with Ascend today, but has anyone else run
> into this, and if so, how did you fix it?

Point both of your RadiusNT servers at your primary DB. Thats the
easiest way to fix it. If your primary DB goes down, you can manually
switch them to the less recent, Secondary DB.

--Dale E. Reed Jr.  (       IEA Software, Inc.      |  RadiusNT, Emerald, and NT FAQs Internet Solutions for Today  |

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