First, you are monitoring UDP port 1645, not TCP port 1645, right?
Second, there is no, easy way to do this. With TCP, you can connect
to the port and assume that the process ( http, ftp, smtp, etc. ) is
alive and working, as the port is being listened on. However since
Radius uses UDP, which is a stateless protocol, unless you can get the
server to send a response back, you have no way of knowing whether the
UDP packets you sent were received.
If you want a way to send a 'radius ping' you will have to determine a
way to build your own Radius Packet, and send it to the server. The
RFC describing the Radius protocol can be found at:
http://www.cabletron.com/support/internet/RFC/rfc2138.txt
Two radius codes you may want to play around with, ( note the
experimental ), are:
12 Status-Server (experimental)
13 Status-Client (experimental)
Or you could construct an actual Access Request if you want to go that
far.
The short answer, which I think you were looking for, is that there isn't
an easy way to do this, as it uses UDP. :\
-Chris
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