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DHCP Client reservation Multiple IP

Posted on 2004-08-26
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Last Modified: 2013-12-19
Hi,

If I can receive a reserved IP in 10.11.100.0/24 from a DHCP, how to get a second IP (for management) in a other subnet (10.100.100.0/24)
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Question by:dombard
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by:scampgb
ID: 11901687
Hi dombard,

Do you have two network adapters in the machine, each connected to a different subnet?
In this case, you can just enable DHCP on both NICs.

If not, can you explain a little more about your setup.  What DHCP servers you have and how things are cabled?

Thanks
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by:dombard
ID: 11901716
I use only 1 adapter.
W2k DHCP
We have a Lan with 500 PC, 10 servers, 10x48 switch 3com 4400/4900 ...
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by:scampgb
ID: 11902078
I don't think you're going to able to do this.  

You *might* be able to get it to work if you have more than one DHCP server and you put in reservations for both of them.  I really don't think it'll work though.

However, you can statically define multiple IP addresses.
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Author Comment

by:dombard
ID: 11902196
Ok, I will try the same DHCP server on a second IP

On a workstation with one adapter, XP Pro, if i get a IP from DHCP, how to get /set a second IP. ?
Under panel IP.Alternate Config, the IP there is not keep with DHCP enable.
May be a missunderstanding of what is a Alternate configuration
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by:scampgb
ID: 11902225
You're not able to use DHCP to get a second IP address on the same network card.
Alternative configuration is use to configure static IPs on the machine.

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by:dombard
ID: 11902333
Thank for your precision about the alternative config

So you tell me It's not possible to get 2 IP on one adapter with DHCP enable ?
May i have some reference (links) about you confirmation.
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scampgb earned 500 total points
ID: 11902650
http://www.microsoft.com/resources/documentation/windows/2000/server/reskit/en-us/tcpip/part2/tcpch04.mspx explains how the DHCP process works.
It's goes into quite a bit of detail, but covers process well.

I'm convinced that you can't get two DHCP addresses from the same DHCP server for the same NIC.  I'm not seen anything that says it is possible, but I can't find much that says it isn't!
The closest thing I can find is:
"On Win98 and Linux I am able to have one interface via DHCP and the other static, however Win2k does not allow this. Win2k will only allow multiple static IPs on one NIC." from http://techrepublic.com.com/5206-6247-0.html?forumID=12&threadID=110130&start=0
That poster goes on to say that it's not been tested with XP.
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by:scampgb
ID: 11902976
Hi Dombard.  Thanks for accepting my answer.  Sorry that it asn't what you wanted to hear!
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