Sending authentication-requests to multiple radius-servers

[Stefan Kuegler]

Hello.

I have a short question:
Is it possible to send an authentication-request from a client to 
multiple servers simultaneously ?

                                         +----------+
                                  /----->| radius A |
  +--------+    +--------------+ /       +----------+
  | client |--->| radius proxy |X
  +--------+    +--------------+ \       +----------+
                                  \----->| radius B |
                                         +----------+

We now authenticate with HMAC-based One Time Password Token (aka 
event-based token) from a Cisco ASA via radius to only one 
freeradius-server. But we want to establish a second authentication 
server for failover reasons.

When using event based tokens, it's absolute necessary that every server 
receives the same authentication request simultaneously from the client 
to trigger the next "event" on the server side.

Best Regards,
Stefan Kuegler