IP aliases on a DHCP'ed interface

Hi

maybe this is a FAQ but I cannot ind a clear answer (apart from "it's not
possible"): is there a way to add another IP (an alias) to the same network
interface if the NIC is configured to get its address from a DHCP server?
Graphically, now way
Via netsh, if I +add* an address it replaces the DHCP configuration. Any
other more obscure way?

Thanks in advance

If you want to setup one static IP and another is dynamic IP, yes, you can.
This how to may help.
ipconfig
How to ping on the entire subnet. How to setup multiple IPs on NIC ...
windows server with just one NIC and have multiple public IPs for different
websites. ...
www.howtonetworking.com/Networking/ipconfig.htm


--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com


"Vide" <> wrote in message
news:...
> Hi
>
> maybe this is a FAQ but I cannot ind a clear answer (apart from "it's not
> possible"): is there a way to add another IP (an alias) to the same
> network
> interface if the NIC is configured to get its address from a DHCP server?
> Graphically, now way
> Via netsh, if I +add* an address it replaces the DHCP configuration. Any
> other more obscure way?
>
> Thanks in advance
>

Bob Lin (MS-MVP) wrote:

> If you want to setup one static IP and another is dynamic IP, yes, you
> can. This how to may help.

> www.howtonetworking.com/Networking/ipconfig.htm


Sorry but from the FAQ you linked

"Q: I have a windows server with just one NIC and have multiple public IPs
for different websites. Can I have multiple IPs on one NIC?

A: Yes, the Properties of the NIC>Properties of TCP/IP>Advanced, add
additional IPs."

but as I said if the interface is configured as DHCP, then the additional
IPs section is greyed out. I need a WinXP/Vista/7 client in a DHCP
environment to have 2 IPs on the same NIC, one dynamic and one static. With
your solution is still not possible.

Please read one below How to setup multiple IPs on NIC: How to setup two
IPs on a computer

--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com


"Vide" <> wrote in message
news:%23Is$...
> Bob Lin (MS-MVP) wrote:
>
>> If you want to setup one static IP and another is dynamic IP, yes, you
>> can. This how to may help.
>
>> www.howtonetworking.com/Networking/ipconfig.htm
>
>
> Sorry but from the FAQ you linked
>
> "Q: I have a windows server with just one NIC and have multiple public IPs
> for different websites. Can I have multiple IPs on one NIC?
>
> A: Yes, the Properties of the NIC>Properties of TCP/IP>Advanced, add
> additional IPs."
>
> but as I said if the interface is configured as DHCP, then the additional
> IPs section is greyed out. I need a WinXP/Vista/7 client in a DHCP
> environment to have 2 IPs on the same NIC, one dynamic and one static.
> With
> your solution is still not possible.
>
>
>
>

Bob Lin (MS-MVP) wrote:

> Please read one below How to setup multiple IPs on NIC: How to setup two
> IPs on a compute

But the "Alternate Configuration" is used only if DHCP fails, while I need
two IPs at the *same time*.

Then you have to stop using DHCP on that machine. It is that simple.

DHCP is nothing but a "convenience tool" for dealing with mass workstations
operating in a normal way in a normal situation.



"Vide" <> wrote in message
news:%23di7IT$...
> Bob Lin (MS-MVP) wrote:
>
>> Please read one below How to setup multiple IPs on NIC: How to setup two
>> IPs on a compute
>
> But the "Alternate Configuration" is used only if DHCP fails, while I need
> two IPs at the *same time*.
>

"Vide" <> wrote in message
news:%23di7IT$...
> Bob Lin (MS-MVP) wrote:
>
>> Please read one below How to setup multiple IPs on NIC: How to setup two
>> IPs on a compute
>
> But the "Alternate Configuration" is used only if DHCP fails, while I need
> two IPs at the *same time*.
>


I have to agree with Paul. DHCP configured clients do NOT support what you
are trying to do. The machine needs to set to a static config in order to
use multiple IPs that work together.

--
Ace

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSA Messaging, MCT
Microsoft Certified Trainer


For urgent issues, you may want to contact Microsoft PSS directly. Please
check http://support.microsoft.com for regional support phone numbers.

"Ace Fekay [Microsoft Certified Trainer]" <>
wrote in message news:...
>
> I have to agree with Paul. [...]

Err.. sorry Phillip!!! My apologies!!!

Ace

Phillip Windell wrote:

> Then you have to stop using DHCP on that machine. It is that simple.

So going back to my first post Well at least now I'm sure there's no
other way.

> DHCP is nothing but a "convenience tool" for dealing with mass
> workstations operating in a normal way in a normal situation.

Definitely, but through DHCP you can push far more network settings than
just the plain IP, so just disabling it for a number of machines is not
convenient at all. But on the other hand I *need* this second aliased IP due
to an integration with an external system that I cannot touch :/

Thanks anyway.

"Vide" <> wrote in message
news:...
> Phillip Windell wrote:
>
> Definitely, but through DHCP you can push far more network settings than
> just the plain IP, so just disabling it for a number of machines is not
> convenient at all. But on the other hand I *need* this second aliased IP
> due
> to an integration with an external system that I cannot touch :/
>
> Thanks anyway.
>

Unfortunately, it's the way it works. I agree DHCP provides numerous (scope
or server) options compared to a statically configured client, and some of
them can be statically set, but it depends on the options.

Are you using any specific scope options that you need set on all machines
that is required, which is holding you back from statically configuring a
client to intergrate wtih that external system?

Also, curious, what or how exactly do you mean this client must "integrate"
with this external system? IS it running some sort of app that needs
specific connectivity? Is there a separate router on a different IP subnet
on your local subnet that it needs to connect? (This of course will require
more thought in the design with multiple gateways on the cilent.). By
external, do you mean it is outside your subnet (internet or in a different
location), or is not part of your domain but is internal on your subnet?
What kind of system is it? If we knew some specifics about what you are
trying to accomplish, system type, protocols, client apps, etc, there is a
possibility we *may* (no guarantees of course), come up with an alternate
solution.

Ace