Proper use of "allow/deny unknown-clients"?

[John Miller]

Hello folks,

We're running into a seemingly odd issue:  when we specify "allow
unknown-clients" within one of our address pools, known clients are no
longer to obtain IP addresses.  When we remove the allow/deny rule
altogether, there's no problem with either known or unknown clients
connecting.

Can anyone shed some light on the proper use of this parameter, and why
explicitly specifying an allow rule would block out known clients?

We've got a ton of address pools, so I won't list them all, but the
relevant pool is:

shared-network GuestWIRELESSNORTH {
    subnet 129.64.173.0 netmask 255.255.255.0 {
        option broadcast-address 129.64.173.255;
        option routers 129.64.173.1;
        option domain-name-servers 129.64.99.205, 129.64.100.205;
        option domain-name "guest.brandeis.edu";
        default-lease-time 3600;
        max-lease-time 3600;
        ddns-updates on;
    }
    pool {
          allow unknown-clients;
          range 129.64.173.10 129.64.173.250;
          failover peer "brandeis-dhcp";
    }
}


John
-- 
John Miller
Systems Engineer
Brandeis University
johnmill at brandeis.edu
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