well if u are testing freeradius with NTRADPING then this wat i did some time back
 
 
add the following in user file
 
# Framed-MTU = 1500,
# Framed-Compression = Van-Jacobsen-TCP-IP
###############punith added this for testing#########################
punith Cleartext-Password := "test123"
root Cleartext-Password := "root123"
dam Cleartext-Password := "dam123" 
#####################################################################
#
# This is an entry for a user with a space in their name.

add the following in radius.conf
 

# sql

#########punith added this for testing#########
etc_group
###############################################
 #
 #  If you are using /etc/smbpasswd, and are also doing

add the following in the client file
 
 

# password    = someadminpas
}

#client some.host.org {
# secret  = testing123
# shortname = localhost
#}

####punith added this for testing###########
client 172.22.55.222 {
 secret  = mysec
 shortname = punith
}
client 172.22.54.64 {
 secret  = mysec
 shortname = punith
}
client 172.22.55.10 {
        secret          = mysec
        shortname       = root
}
client 10.19.1.237 {
        secret          = mysec
        shortname       = root
}
##############end###########################

#
#  You can now specify one secret for a network of clients.

Then i used NT radping  with the following parameters
 
radius secret --> mysec
user -->root
password -- > root123
 
 
hope this helps u !
I am not sending this to mail list cos i am not sure abt it but i got this  through googling
 
or use this
 
radtest punith test123 <radius -ip> 1812 mysec <nas ip>
if no nas then just put 10
radtest punith test123  <radius -ip> 1812 mysec 10
 
regards