DHCP reservation

[Guest]

Hi,

I have a DHCP Server which leases ips for 3 subnets in a superscope. I want
the dynamic IPs leased by one scope has to be reserved automatically to the
client which has got the lease. Any body can help me ?

my thanks in advance.

 

[Phillip Windell]

I have a DHCP Server which leases ips for 3 subnets in a superscope.

What's the Superscope for? Get rid of it.

I want the dynamic IPs leased by one scope has to be reserved automatically to the
client which has got the lease.

What does that mean?

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------

 

[Richard G. Harper]

First, follow Phillip's advice. The superscope is not needed and
complicating matters for you, so dump it.

Second, as for a computer picking up a lease - this question is somewhat
confusing but I think I understand ... you want to create a reservation for
a PC, then have it pick up that reservation no matter what logical network
it's on, right? If so, then the answer is "It ain't gonna happen". If a PC
has a reservation in one range (say, 192.168.0.x) and is moved to a new
logical network (say, 192.168.2.x) it cannot pick up the reservation in the
first range if the ranges are divided by a router or other network hardware.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm

 

[Guest]

Dear Phillip,

My question is, if the DHCP server leases an IP say 192.168.1.1 to mac
address A,
i want to create a reservation for that mac address A with the IP
192.168.1.1 and this should be done automatically with out manual work.
awaiting for ur reply.

Thanks and regards
Baskaran B

I want the dynamic IPs leased by one scope has to be reserved automatically to the
client which has got the lease.

What does that mean?

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

 

[Guest]

Dear Richard,

All my client systems are physically in same network segment and no routers
or network devices are seperating them. There are three subnets say
192.168.1.x/24, 192.168.2.x/24 and 192.168.3.x/24 with three different
gateways to access the onsite network (I dont have access to routers as they
are controlled by BT). so only i have used a superscope to lease 3 subnets.
A particular resource in onsite network can be accessed only by 192.168.2.x
network only. so i want to reserve 240 clients with 192.168.2.x addresses. i
want this task to be done automaticaly. I will enable the 192.168.2.x scope
and convert the particular clients to DHCP ip addressing, so that the
particular clients will get the 192.168.2.x addresses. In future the IPs of
the particular machines should not change, so i want to reserve the IP
address which the 192.168.2.x scope has leased.
I dont want to do 240 reservations manualy. so i want to know any other way
to automaticaly reserve the IPs to clients which the DHCP server leases. Hope
this explains you clearly. Awaiting for your reply.

Thanks and regard
Baskaran B

 

[Phillip Windell]

My question is, if the DHCP server leases an IP say 192.168.1.1 to mac
address A,
i want to create a reservation for that mac address A with the IP
192.168.1.1 and this should be done automatically with out manual work.
awaiting for ur reply.

No it cannot be done automatically. You have to type the information for the
reservation manually yourself.

Get rid of the Superscope.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------

 

[Phillip Windell]

All my client systems are physically in same network segment and no routers
or network devices are seperating them. There are three subnets say
192.168.1.x/24, 192.168.2.x/24 and 192.168.3.x/24 with three different
gateways to access the onsite network

Ok, so you do have a Multi-Net and therefore this is one of the few and
extremely rare instances where a Superscope is required. As far as the
Reservation you still have to enter it in yourself, there is no what for it
to get entered in there itself.

You could also get more address by rolling the mask back by one "bit" and
forget the whole "multi-subnet-on-one-wire-thing", although you shouldn't
because you should keep the number of hosts per subnet to 250-300. Also if
you have such a large network that you need 759 addresses [(255x3)-6] then
you surely have the budget for a LAN Router, heck you can make one out of an
old NT Workstation box of a Linux box.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------

 

[Guest]

Dear Phillip,

Thanks for your reply. I tried one thing, i exported the DHCP server's
current leases in an excel sheet and collected the IP,Hostname and Mac
address of the clients. I updated this details in an text pad as a DHCP query
as follows,

Dhcp Server <dhcp server ip> Scope <scopename> Add reservedip <IP address>
<Mac address> <"hostname"> <"description"> "DHCP"

and run the query through "Netsh exec filename" command, and it created the
reservations.

Thanks and regards
Baskaran B

All my client systems are physically in same network segment and no routers
or network devices are seperating them. There are three subnets say
192.168.1.x/24, 192.168.2.x/24 and 192.168.3.x/24 with three different
gateways to access the onsite network

Ok, so you do have a Multi-Net and therefore this is one of the few and
extremely rare instances where a Superscope is required. As far as the
Reservation you still have to enter it in yourself, there is no what for it
to get entered in there itself.

You could also get more address by rolling the mask back by one "bit" and
forget the whole "multi-subnet-on-one-wire-thing", although you shouldn't
because you should keep the number of hosts per subnet to 250-300. Also if
you have such a large network that you need 759 addresses [(255x3)-6] then
you surely have the budget for a LAN Router, heck you can make one out of an
old NT Workstation box of a Linux box.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

 

[Phillip Windell]

Yes, I forgot about the import/export stuff. There is actually a utility
out there for that. However I never knew you had another "previous
configuration" to do any exporting from to begin with or I might have
thought of that.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------

Dear Phillip,

Thanks for your reply. I tried one thing, i exported the DHCP server's
current leases in an excel sheet and collected the IP,Hostname and Mac
address of the clients. I updated this details in an text pad as a DHCP query
as follows,

Dhcp Server <dhcp server ip> Scope <scopename> Add reservedip <IP address>
<Mac address> <"hostname"> <"description"> "DHCP"

and run the query through "Netsh exec filename" command, and it created the
reservations.

Thanks and regards
Baskaran B

All my client systems are physically in same network segment and no routers
or network devices are seperating them. There are three subnets say
192.168.1.x/24, 192.168.2.x/24 and 192.168.3.x/24 with three different
gateways to access the onsite network

Ok, so you do have a Multi-Net and therefore this is one of the few and
extremely rare instances where a Superscope is required. As far as the
Reservation you still have to enter it in yourself, there is no what for it
to get entered in there itself.

You could also get more address by rolling the mask back by one "bit" and
forget the whole "multi-subnet-on-one-wire-thing", although you shouldn't
because you should keep the number of hosts per subnet to 250-300. Also if
you have such a large network that you need 759 addresses [(255x3)-6] then
you surely have the budget for a LAN Router, heck you can make one out of an
old NT Workstation box of a Linux box.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp