At the NAS level - no. A RADIUS client will only failover to a backup
when the primary fails to respond.
You could do this via RADIUS Proxy - where if the primary server fails
to auth, instead of issuing an Access-Reject it sends a Proxy request
to the other server. This isn't a normal situation, but I believe
Lucent Port Authority RADIUS and Radiator both include this capability,
and it wouldn't be hard to hack it into Cistron if it doesn't do it
natively.
-MZ
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