Thanks it was the Linux firewall. I opened UDP ports 1812:1816 and everything works

[>Thanks for the response. My original email was very lengthy, but at the bottom 



you can see a wireshark capture showing the packet arrival. (My understanding is 



wireshark is a pretty GUI based on tcpdump)



>







Yes, it arrived but can't get through the firewall. You say you are



using default freeradius configuration, so you haven't done anything



strange to listen section to cause this - it has to be tha firewall.]