diffrent services from same IP

[SkyDiablo]

hi,

i have running a freeradius, all works fine... but now, i need to handle 
two diffrent services from the same IP in diffrent virtual server.

in detail: i have a VPN server and one or more coova chilli systeme. all 
this freeradius clients will running on the same system (localhost) but 
if i load the client configs, it throws the error "Failed to add 
duplicate client". of course, all client will have the same IP, all 
client running under localhost.
it is possible to handle this ? diffrent services/clients on the same IP ?

greez & thx,
   volker...