Configuring option 82

[Surya Teja]

Hi,
I am trying to configure the dhcp option 82, went through the google forums
and one of it suggest the syntax like
# vim /etc/dhcp/dhcpd.conf
########################################################
log-facility local7;






*class "VLAN10" {        match if binary-to-ascii(10,16,"",substring(option
agent.circuit-id,2,2)) = "10";} # VLAN10class "VLAN20" {          match if
( substring(option agent.remote-id,2,15)="10.5.20.4" and
binary-to-ascii(10, 16, "",substring(option agent.circuit-id, 4, 2)) = "2"
); }*
subnet 192.168.10.0 netmask 255.255.255.0 {
        pool {
                *allow members of                "VLAN10";*
                default-lease-time               600;
                max-lease-time                    7200;
                range                           192.168.10.1 192.168.10.199;
                option routers                  192.168.10.254;
                option broadcast-address        192.168.10.255;
                option subnet-mask              255.255.255.0;
                option domain-name-servers      4.2.2.2;
}
}
subnet 192.168.20.0 netmask 255.255.255.0 {
        pool {
       * allow members of                "VLAN20";*
        default-lease-time              600;
        max-lease-time                  7200;
        range                           192.168.20.20 192.168.20.199;
        option routers                  192.168.20.254;
        option broadcast-address        192.168.20.255;
        option subnet-mask              255.255.255.0;
        option domain-name-servers      4.2.2.2;

}
(Just ignore ip values)
can we configure this concept only by using classes and make it allow or
deny like that?
or can we use the option space concept to get it worked(do we have any
other syntax). Thanks in advance
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