Deploying Freeradius in a HA environment

Arran Cudbard-Bell A.Cudbard-Bell at
Mon Jun 16 10:09:46 CEST 2008

A.L.M.Buxey at wrote:
> Hi,
>> I would have to dispute that. We've seen NASes across the range (Cisco, 
>> 3Com, Extreme) fail to move to the backup/secondary radius server they've 
>> got configured.
> report such bugs to the manufacturers of the NAS devices and double
> check your device configs -
>  several of them have quirky ways of failing
> over. if you do want to point to a single IP etc then just standard
> L4 balancing will work
Yes, though if you're using EAP make sure that requests from a NAS 
aren't spread over multiple servers.
>  - but ensure that the FR boxes are sharing
> the same information if you rely on accounting records for decisions
> (eg simultaneous usage)

If you're look for a generic solution, layer 7 load balancers are the 
answer; We are considering them because NAS based fail-over schemes are 
never perfect, you always have to have a few missing responses before 
the NAS realises something is up and does something about it.

Arran Cudbard-Bell (A.Cudbard-Bell at,
Authentication, Authorisation and Accounting Officer,
Infrastructure Services (IT Services), 
E1-1-08, Engineering 1, University Of Sussex, Brighton, BN1 9QT
DDI+FAX: +44 1273 873900 | INT: 3900

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