DHCP - Exclusions vs. Reservations

Greetings,

Looking for some clarification; as I understand it:
When setting DHCP Options I can establish an Exclusion (DHCP will not offer
the address for use at all) and set the IP address statically on a specific
machine, or I could establish a Reservation (ties a specific IP address to a
specific MAC address and will only offer that IP to the coordinating MAC).

This in mind, is there any reason for me to exclude addresses that will be
used in reservations?

TIA,
JR

Not really. Only the intended system will get the address. In general,
people tend to use exclusions for entire ranges, and reservations for
individual systems or exceptional cases. Reservations are also used in
higher-security environments to prevent erroneous distribution.

"JR" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Greetings,
>
> Looking for some clarification; as I understand it:
> When setting DHCP Options I can establish an Exclusion (DHCP will not
offer
> the address for use at all) and set the IP address statically on a
specific
> machine, or I could establish a Reservation (ties a specific IP address to
a
> specific MAC address and will only offer that IP to the coordinating MAC).
>
> This in mind, is there any reason for me to exclude addresses that will be
> used in reservations?
>
> TIA,
> JR
>
>

Excluded address are never assigned dynamically. Reserved
address are assigned dynamically to the hardware (MAC)
address. This being the case, you can dynamically asigned
assigned scope options to reserved addresses. This is
especially helpful if you want to assign scope options to
newly defined user or vender class.
>-----Original Message-----
>Greetings,
>
>Looking for some clarification; as I understand it:
>When setting DHCP Options I can establish an Exclusion
(DHCP will not offer
>the address for use at all) and set the IP address
statically on a specific
>machine, or I could establish a Reservation (ties a
specific IP address to a
>specific MAC address and will only offer that IP to the
coordinating MAC).
>
>This in mind, is there any reason for me to exclude
addresses that will be
>used in reservations?
>
>TIA,
>JR
>
>
>.
>

No, you do NOT want to exclude address that you have reserved. Use
exclusions for addresses being assigned statically to machines.

--

Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.


"JR" <(E-Mail Removed)> wrote in message
news:#(E-Mail Removed)...
> Greetings,
>
> Looking for some clarification; as I understand it:
> When setting DHCP Options I can establish an Exclusion (DHCP will not
offer
> the address for use at all) and set the IP address statically on a
specific
> machine, or I could establish a Reservation (ties a specific IP address to
a
> specific MAC address and will only offer that IP to the coordinating MAC).
>
> This in mind, is there any reason for me to exclude addresses that will be
> used in reservations?
>
> TIA,
> JR
>
>

Keith and Marvin,

Thanks...

JR

....and Marc!

No,
When you are rserving an IP address (with MAC address), it is still DHCP
which is assigning the IP to the client.
Where as when put in exclusion, that IP address is
not at all assigned by the DHCP.
When you add a reservation, you do not add it in exclusing range, on the
otherhand if it is already in exlcusion range, you remove it from exclusion
range.

Sharad
"JR" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Greetings,
>
> Looking for some clarification; as I understand it:
> When setting DHCP Options I can establish an Exclusion (DHCP will not
offer
> the address for use at all) and set the IP address statically on a
specific
> machine, or I could establish a Reservation (ties a specific IP address to
a
> specific MAC address and will only offer that IP to the coordinating MAC).
>
> This in mind, is there any reason for me to exclude addresses that will be
> used in reservations?
>
> TIA,
> JR
>
>

It depends on the OS, Windows NT handles this differently from W2k.

"JR" <(E-Mail Removed)> wrote in message news:<#(E-Mail Removed)>...
> Greetings,
>
> Looking for some clarification; as I understand it:
> When setting DHCP Options I can establish an Exclusion (DHCP will not offer
> the address for use at all) and set the IP address statically on a specific
> machine, or I could establish a Reservation (ties a specific IP address to a
> specific MAC address and will only offer that IP to the coordinating MAC).
>
> This in mind, is there any reason for me to exclude addresses that will be
> used in reservations?
>
> TIA,
> JR


It depends on the OS, Windows NT handles this differently from W2k.