Captive Portal

Hi All,
I am trying to implement a captive portal with cases like where users can
be guest,authenticated and unknown-clients without restarting the dhcp
service frequently.
Initially the client will be getting the IP from the quarantine range and
the user getting a custom portal page where he can be authenticated or
accept the terms and be as a guest.
I tried to use the concept of known and unknown-clients so that using omapi
concept i can add an authenticated client as known client so that it does
not need a restart of dhcp service.
but I want to add one more case where I can differentiate the clients also
as guest users
can anyone suggest to me any config element where I can differentiate all
these three cases(non-authenticated, authenticated and guest).
My sample config
==============
subnet 172.16.0.0 netmask 255.255.255.0 {
        pool {
                range 172.16.0.50 172.16.0.150;
                allow unknown-clients;
                option domain-name-servers 172.16.0.40
                default-lease-time 120;
                max-lease-time 120;
                option routers 172.16.0.1;
                option subnet-mask 255.255.255.0;
             }
pool {
                range 172.16.0.151 172.16.0.200;
                deny unknown-clients;
                 option domain-name-servers 172.16.0.45
                default-lease-time 1209600;
                max-lease-time 1209600;
                option routers 172.16.0.2;
                option subnet-mask 255.255.255.0;

             }
        pool {
               range 172.16.0.201 172.16.0.250;
                <condition to accept guest client>
                option domain-name-servers 172.16.0.45
                default-lease-time 1209600;
                max-lease-time 1209600;
                option routers 172.16.0.2;
                option subnet-mask 255.255.255.0;

             }
        }
Any help/suggestion would be much appreciated
Thanks

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