Two IP addresses on the same network interface

[pguerra]

I need two IP addresses on the same network interface: one of them is dynamic (assigned by a DHCP server), and the other one is static. Anybody knows how to do this on Windows XP SP 2??

 

[kcnychief]

You can't have two seperate IP addresses on one Network Interface Card that are on the same network. If the two IP's are on two different networks/subnets, you could use the Alternate Configuration tab.

If you need two IP addresses on one network, pick up another NIC for the machine.

 

[Admiral Michael]

KC: The alternate IP tab is to use a specific IP if the system can't get one (instead of the 169.x.x.x address)

pguerra: Under the TCP/IP properties there is an area to add more then one IP however when I went to look at it I wasn't able to add an IP since I have DHCP enabled.

 

[pguerra]

You can't have two seperate IP addresses on one Network Interface Card that are on the same network. If the two IP's are on two different networks/subnets, you could use the Alternate Configuration tab.

If you need two IP addresses on one network, pick up another NIC for the machine.

What does the command 'netsh interface ip add address' do then??

 

[kcnychief]

KC: The alternate IP tab is to use a specific IP if the system can't get one (instead of the 169.x.x.x address)

pguerra: Under the TCP/IP properties there is an area to add more then one IP however when I went to look at it I wasn't able to add an IP since I have DHCP enabled.

You are right and you are wrong. The Alternate Configuration tab CAN be used in the scenario where one can't be obtained, but it can also be used for an alternate network-type configuration.

This is NOT possible, again I say NOT possible, with one NIC. If you were using all static, you could. BUT, with DHCP enabled, you do not have the option of configuring additional IP addresses.

 

[pguerra]

pguerra: Under the TCP/IP properties there is an area to add more then one IP however when I went to look at it I wasn't able to add an IP since I have DHCP enabled.

As I said before, I need two IP addresses: one of them must be assigned by the DHCP server, and the other one static (i.e. assigned by me )

 

[kcnychief]

What does the command 'netsh interface ip add address' do then??

You could use that command to set static IP's, but you can't have DHCP enabled and set a valid internal static IP on the same interface.

 

[pguerra]

You could use that command to set static IP's, but you can't have DHCP enabled and set a valid internal static IP on the same interface.

:devious: Is this some sort of Microsoft's TCP/IP limitation, or what I'm trying to do doesn't make sense at all?

 

[kcnychief]

What you are trying to do makes sense, but it's not logically possible.

Save yourself the headache, go to the store and spend $10-20 on another NIC. Problem solved - you won't find a way to do it unless you switch to all static (ditching DHCP).

 

[pguerra]

What you are trying to do makes sense, but it's not logically possible.

What do you mean it's not logically possible?

Save yourself the headache, go to the store and spend $10-20 on another NIC.

I need to do this on more than one computer, so this is most likely the last option I'll try..
Besides I don't wanna mess with the hardware..

you won't find a way to do it unless you switch to all static (ditching DHCP).

One of the IP addresses MUST be DHCP-assigned. There's just no other way!

 

[kcnychief]

What exactly are you trying to accomplish? What do you need this setup for?

 

[pguerra]

What exactly are you trying to accomplish? What do you need this setup for?

There are some computers connected to a switch, and their IP addresses are assigned by a DHCP server. The problem is that these IP addresses don't necessary belong to the same network, so some computers can't see the others using NetBIOS.

 

[Johnny]

What about a daul wan router ??

 

[kcnychief]

Well, assuming this is a domain, the easiest way to do that would be to create reservations on your DHCP server to the MAC addresses of the PC's in mention. Once that is done, create type "A" (Host) DNS entries for each machine on the DNS server. The next time the clients update, that problem should be resolved.

 

[pguerra]

What about a daul wan router ??

Messing with the hardware should be the last option!

Well, assuming this is a domain, the easiest way to do that would be to create reservations on your DHCP server to the MAC addresses of the PC's in mention. Once that is done, create type "A" (Host) DNS entries for each machine on the DNS server. The next time the clients update, that problem should be resolved.

It's not a domain. It's just a workgroup. And I don't have access to the DHCP and DNS servers.. :cry:

 

[kcnychief]

Well....

If you don't have access to the DHCP and DNS servers, and you don't have the option of adding additional NICs - you don't seem to have much control over the operations.

If that is the case, why is this your problem? Could you suggest these feature changes to the system administrators?

 

[pguerra]

If you don't have access to the DHCP and DNS servers, and you don't have the option of adding additional NICs - you don't seem to have much control over the operations.

Right.

Could you suggest these feature changes to the system administrators?

No.

The only thing I can think of is to set up some application in every computer to get the IP address / subnet mask / DNS server / etc. from the DHCP server and set this all as if they were static addresses.

 

[kcnychief]

I have to ask - if you don't have access to these resources, can't install hardware and can't suggest any network settings, wouldn't setting these things up get you in trouble?

I have to think that if what you are trying to do is mission critical, you would have the available resources to do it.

 

[pguerra]

I have to ask - if you don't have access to these resources, can't install hardware and can't suggest any network settings, wouldn't setting these things up get you in trouble?

Not really.

I have to think that if what you are trying to do is mission critical, you would have the available resources to do it.

It's not mission critical. I think of it as a challenge, nothing more..

 

[ejn74]

He's in Argentina KC, things are a little different there than here in the States.