Only allow pool range nothing else

[Marc Roos]

With this configuration a "testing" client can get an ip address 
192.168.11.44. How can I make sure the clients identifying with 
"testing" are only getting the ip addresses reserved in the pool (eg 
192.168.11.43) and nothing else. So no ip adress should be issued when 
the all ip addresses of the range have been already assigned.


subnet 192.168.11.0 netmask 255.255.255.0 {
        #option routers          192.168.11.1;
        option subnet-mask      255.255.255.0;
        option domain-name-servers      192.168.11.10,212.19.193.130;

        #range   192.168.11.9    192.168.11.11;
        pool { allow members of "testing"; range 192.168.11.43 
192.168.11.43; }
        deny unknown-clients;
}