Kill radiusd in status > services, start it again via the shell using /usr/local/etc/raddb/radiusd -x, I believe that is how you start radius in debugging mode. There is no need to sniff when radius will tell you if it gets anything. you may have to execute it with an X in caps though, I don't remember. But ocassionally radius will recieve packets but ignore them, most commonly when it doesn't feel that the incoming packet is from a valid client device. It sounds like you got it fixed, but this is a much easier way of troubleshooting radius for future reference.
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