Multiple IP-addresses on a Network Card
This page covers both Windows95/98 and Windows
Sometimes it is necessary to assign to a Networking card more
Windows NT4 and 2000 :
In the Network-Properties, Tab: "Protocols",
"Properties" of the "TCP/IP-protocol":
click on the button: "Advanced",
then on "Add" to define
Although not requested by Windows NT on exiting the Network
properties, you need
to reboot your system so that the new IP-address becomes
||You can check the
assigned to a network card
by opening a Command-Box
and running : "IPCONFIG"
Assigning multiple IP-addresses to a network card is not as
simple as under Windows NT,
there is no possibility in the Properties of TCP/IP-protocol to define this, it is required to
edit manually the Registry to achieve this job:
Included in the Win98 Resource Kit (chapter
15 page 607) but not documented
else by Microsoft:
Assigning multiple IP Address's to a single NIC under
Multiple IP Address's can be assigned to any given Network
To do this, you must use the registry editor (regedit.exe).
|The usual warning:
Be carefully making changes to your system registry !
A wrong change can make your system inoperational !
It is strongly suggested to make a backup of the registry
before making the modifications shown below.
1. Run Regedit.exe
2. Drill down into HKEY_LOCAL_MACHINE\Enum\PCI for PCI Ethernet
or HKEY_LOCAL_MACHINE\Enum\ISAPNP for ISA-Plug-and-Play adapters
or HKEY_LOCAL_MACHINE\Enum\Root\Net for ISA-Non-Plug-and-Play
3. Search all sub-keys until you locate the one with
the "DeviceDesc" and
matching your network card. Look for the value which is set for
the "Driver" entry.
It should be like Net\00xx.
4. Now drill down into
where xx is the value determined from step 3.
5. Look what the value is set for the "Driver"
It should be like NetTrans\00yy.
6. Now drill down into
where yy is the value determined from step 5.
7. Edit the value of the entry "IPAddress" and append
it with a comma and
then the 2nd IPAddress (example.
"126.96.36.199,188.8.131.52.1" ) With this
configuration you adapter
responds to both IP addresses.
8. You must also edit and append the "IPMask" value as
well, and must
specify the correspondent subnet mask for each listed IP address.
10. Run Winipcfg.exe and you will see a
button to the right of your
listed IP address to show you the next IP of that adapter.
While I have no problem following these steps on Windows95 with a
Non-Plug-and-Play NE-2000 networking card, I could not find on
with a Realtek-PCI-card the link from step 3 to step 4.
So I did it the "Brute Force" method:
I simply searched the registry for the
existing IP-address , which did bring me
immediately to step 6, where I then made the changes , my system did then
recognize both IP-addresses.
If you need to use DHCP for one of you IP addresses, set the
first to use DHCP as normal. Follow the all the steps listed
append the "0.0.0.0" with the fixed IP address you wish
to assign to it.
(ie. "0.0.0.0,169.254.254.1" )
I don't know what the limit of IP addresses is per Network
adapter, but I
believe having up to 4 is no problem.