2 ip numbers on 1 computer

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Guest

Is it possible to have 2 different ip numbers on the same computer at the
same time. Anyone knows how to do it?
 
Hi
A Network Card can work only with one IP address.
There are other combinations and Network settings pertaining IP
configuration but you have explain more specifically what is on you mind.
Jack (MVP-Networking).
 
Thanks Jack.

I would like too be able too have 2 windows user account on the same
computer. And they should be using different ip-numbers.
For example i can use a filesharing program on one of the users
and surf on the internet with the other. But with different ipnumbers.

I get 5 ip-numbers from my isp. Is this possible to do somehow?
 
Is it possible to have 2 different ip numbers on the same computer at the
same time. Anyone knows how to do it?
Click to expand...

Here two some ways to do it:

1. Install two network adapters. Each one will have its own IP
address.

2. Assign two static IP addresses to a single network connection:

a. Open the Network Connections folder.
b. Right-click the network connection.
c. Click Properties.
d. Click "Internet Protocol (TCP/IP)".
e. Click Properties.
f. Click "Use the following IP address".
g. Enter the first address.
h. Click Advanced.
i. Click the Add button under "IP addresses".
j. Enter the second address.
k. Click Add.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com
 
Hi

You can assign an alternative IP, as mentioned in Steve's post.

However a choice has to be made which one you are using, you cannot use one
card with two IPs at the same time.

Putting a second card in your computer and using it with a second IP does
nothing either as far as Internet surfing goes.

Two external IPs can be useful in special situations when you use few
devices/computers and one device has to be directly on the Internet while
the other computers are behind a Router, or similar concoction.

As matter of fact, the multiple dynamic IPs given by some ISPs is useless in
almost all cases since it is not providing more Bandwidth (speed), and it
acts against the concept of having a private LAN.

Jack (MVP-Networking).
 
"Jack said:
Hi

You can assign an alternative IP, as mentioned in Steve's post.

However a choice has to be made which one you are using, you cannot use one
card with two IPs at the same time.

Putting a second card in your computer and using it with a second IP does
nothing either as far as Internet surfing goes.

Two external IPs can be useful in special situations when you use few
devices/computers and one device has to be directly on the Internet while
the other computers are behind a Router, or similar concoction.

As matter of fact, the multiple dynamic IPs given by some ISPs is useless in
almost all cases since it is not providing more Bandwidth (speed), and it
acts against the concept of having a private LAN.

Jack (MVP-Networking).
Click to expand...

XP has an "Alternate Configuration" in the TCP/IP properties, but
that's not what I mentioned. Alternate Configuration lets you specify
a static IP address to use if no DHCP server is available.

The configuration that I mentioned gives two static IP addresses to a
single network connection, and you can use both IP addresses at the
same time. The two IP addresses have to be in different subnets,
though, to be useable.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com
 
There is a focus to this discussion.
As far as I can understand the intention of the OP is to use it with one
available Internet connection.
Connecting one computer with two NICs to a single Broadband modem (with a
switch or whatever) does not yield the results that the OP is looking for.
Jack (MVP-Networking).
 
"Jack said:
There is a focus to this discussion.
As far as I can understand the intention of the OP is to use it with one
available Internet connection.
Connecting one computer with two NICs to a single Broadband modem (with a
switch or whatever) does not yield the results that the OP is looking for.
Jack (MVP-Networking).
Click to expand...

The OP mentioned getting 5 IP addresses from his ISP. If they're
static, which is possible, he can assign two of them to a single NIC.
I don't understand his question well enough to know whether that will
accomplish what he wants.

However, I feel that your statement "you cannot use
one card with two IPs at the same time." is too broad, because I had
already pointed out a way to do exactly that in some circumstances.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com
 
Steve said:
The OP mentioned getting 5 IP addresses from his ISP. If they're
static, which is possible, he can assign two of them to a single NIC.
I don't understand his question well enough to know whether that will
accomplish what he wants.

However, I feel that your statement "you cannot use
one card with two IPs at the same time." is too broad, because I had
already pointed out a way to do exactly that in some circumstances.
Click to expand...

Steve,

I understand _how_ to add multiple static IPs to a single NIC, but _why_
would one do this, and how does it work?

If a NIC has multiple IP addresses assigned, what gets placed in the
"source IP address" portion of the IP header of packets sent by that
NIC? The top-most IP address in the list? I wouldn't think that it
would duplicate each outgoing packet for each separate IP address.

I assume that if I configure my NIC with:

192.168.0.101 and
192.168.1.101

I can _receive_ packets from other computers on either the 192.168.0.x
subnet or the 192.168.1.x subnet (without the need for a router).

What happens if my 2-IP address NIC transmits packets? Who can receive
them (without going through a router)?
 
Would it not be possible to workaround the problem by using 2 NICs and
assigning alternate hardware configurations to each user, one or the other
network adapter being disabled depending on which user is logged on?
 
Lem said:
Steve,

I understand _how_ to add multiple static IPs to a single NIC, but _why_
would one do this, and how does it work?
Click to expand...

Hi, Lem. I can't think of a setup in a typical home network where
you'd want multiple static IPs on a singe NIC. A computer acting as a
web server might do that in order to host multiple sites.
If a NIC has multiple IP addresses assigned, what gets placed in the
"source IP address" portion of the IP header of packets sent by that
NIC? The top-most IP address in the list? I wouldn't think that it
would duplicate each outgoing packet for each separate IP address.
Click to expand...

If a packet goes to one of the NICs subnets, I assume that the source
IP address is the one in the same subnet as the destination IP
address. I don't know what would happen otherwise.
I assume that if I configure my NIC with:

192.168.0.101 and
192.168.1.101

I can _receive_ packets from other computers on either the 192.168.0.x
subnet or the 192.168.1.x subnet (without the need for a router).

What happens if my 2-IP address NIC transmits packets? Who can receive
them (without going through a router)?
Click to expand...

That's should work the same as for a 1-IP NIC. A device in the same
subnet as one of the NICs addresses can receive packets directly.
Anything else requires a gateway address and a router.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com
 
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