FreeRADIUS 3.0.1 [Proxy To Another Radius if Reject Received]

Stefan Winter stefan.winter at
Mon Jul 11 13:18:38 CEST 2016


> We are an ISP and we have two radius servers. Each is connected to a
> different Database for a purpose. One of our requirements is to tune the
> primary radius to proxy requests to the secondary in case those requests
> got rejected by the primary. Flow is as below:
> Request flow need to be Primary to Secondary (One-way ONLY)
> Requests are sent to the Primary Radius, then if:
>    a- Access Accept - Okay
>    b- Access Reject - Send same request to the secondary Radius.
> Would you be so kind and advise on the above setup? Is it doable and what
> are the possible methods to implement such?

Much rather than advising how to realise this setup, I'd rather advice
to do a different setup :-)

Many RADIUS clients allow to specify a "primary" and a "backup" RADIUS
server. If there's no reply from primary, they wait for a timeout and
query the second one.

If you need to do two different authentication flows, configure both
RADIUS servers to connect to both databases, and use unlang to steer
which DB to contect first, and under which circumstances to try the second.

That way you get redundant RADIUS servers for free, and can actually
have a *sane* config (the above is pretty much standard stuff).

But it really depends on what is behind the "for a purpose". Maybe there
really is a reason why the primary is not allowed to get access to the
content of the second database, or why its admission decisions are
inferior to and can be preempted by the second server. Without telling
us more about the reason why you think this needs to be like that, it's
hard to say more.


Stefan Winter

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Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et
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