set doesn't work when used for client classing

[Ashmath Khan]

Hello,

Can somebody please let me know why set doesn't work in the following case ?
I don't see any response from dhcpd, it should have choosen a pool for class
"Crule1". Even if it didn't match it should have choosen from "Crule2A". But
no response. Am I missing something ?
Here is the conf file:
subnet 192.168.1.0 netmask 255.255.255.0 {

default-lease-time 86500;
max-lease-time 86500;
option routers 192.168.1.254;

set kind = 0;

if substring (option vendor-class-identifier, 0, 4) = "MSFT" {
set kind = 1;
} elsif substring (option dhcp-option-overload, 0, 4) = "MSFT" {
set kind = 2;
} elsif not exists dhcp-option-overload {
set kind = 21;
}


class "Crule1" {
match if kind = "1";
}

pool {
option router-discovery off;
option domain-name-servers 192.168.1.254, 192.168.1.202;
range 192.168.1.87;
allow members of "Crule1";
}

class "Crule2" {
match if kind = "2";
}

pool {
option router-discovery off;
option domain-name-servers 192.168.1.111;
range 192.168.1.117;
allow members of "Crule2";
}

class "Crule2A" {
match if kind = "0";
}

pool {
option router-discovery on;
option domain-name-servers 192.168.1.222;
option boot-size 512;
range 192.168.1.237;
allow members of "Crule2A";
}


}

thanks
Ashmath
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