DHCP server: how can I guarantee the reserved ip even it's also inside the range

[Tian Tian]

Dear Sir/Madam,

I am the ISC DHCP server user. How can I guarantee the
reserved ip that can be assigned to the specified host
anytime even the reserved ip is inside the dynamical
range?

For example,

=========================================
subnet 10.0.1.0 netmask 255.255.255.0 {
    default-lease-time 28800;
    max-lease-time 28800;
    option subnet-mask 255.255.255.0;
    option broadcast-address 10.0.1.255;
    option routers 10.0.1.1;
    option domain-name-servers 10.0.1.1;
    option domain-name "";
    option netbios-node-type 8;
    option netbios-name-servers 10.0.1.1;
    range 10.0.1.10 10.0.1.20;

    host test {
        hardware ethernet 00:12:3F:1F:2C:31;
        fixed-address     10.0.1.10;
    }
}
=========================================

The fixed-address (10.0.1.10) is reserved for host
"test" and it is also inside the dynamic range
(10.0.1.10 - 10.0.1.20). In this case (I need this
case), the ip 10.0.1.10 could be assigned to a host
"somebodyelse" before the host "test" come to request
a ip.

Plese help me! How can I guarantee the reserved ip
that will not be assigned to "somebodyelse"?

Thanks!

TT

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