two interfaces - same network - different subnet mask

  • Thread starter Thread starter Netmasker
  • Start date Start date
N

Netmasker

On a windows 2000 Server I know that I can't have two interfaces belonging
to the same subnet.

But what happens if I put the two interfaces in the same network e.g.
192.168.1.0 but with a different subnet mask for each interface? Will I have
communication between the two interfaces??

Probably this is a more general networking question but, can the following
hosts communicate without a router:
Host A - IP address: 192.168.1.1 and Subnet mask: 255.255.255.255
Host B - IP address: 192.168.1.2 and Subnet mask: 255.255.255.255

Thanks in advance.
 
Short answer: on Windows 2000, you can have two or more interfaces connected to the same physical network and configured within the same subnet.

--
Dmitry Korolyov [[email protected]]
MVP: Windows Server - Active Directory


On a windows 2000 Server I know that I can't have two interfaces belonging
to the same subnet.

But what happens if I put the two interfaces in the same network e.g.
192.168.1.0 but with a different subnet mask for each interface? Will I have
communication between the two interfaces??

Probably this is a more general networking question but, can the following
hosts communicate without a router:
Host A - IP address: 192.168.1.1 and Subnet mask: 255.255.255.255
Host B - IP address: 192.168.1.2 and Subnet mask: 255.255.255.255

Thanks in advance.
 
I tried this configuration and it didn't work and an article I think
explains it. Have you tried before ??
But you didn't answer my general question...



Short answer: on Windows 2000, you can have two or more interfaces connected
to the same physical network and configured within the same subnet.

--
Dmitry Korolyov [[email protected]]
MVP: Windows Server - Active Directory


On a windows 2000 Server I know that I can't have two interfaces belonging
to the same subnet.

But what happens if I put the two interfaces in the same network e.g.
192.168.1.0 but with a different subnet mask for each interface? Will I have
communication between the two interfaces??

Probably this is a more general networking question but, can the following
hosts communicate without a router:
Host A - IP address: 192.168.1.1 and Subnet mask: 255.255.255.255
Host B - IP address: 192.168.1.2 and Subnet mask: 255.255.255.255

Thanks in advance.
 
Netmasker said:
I tried this configuration and it didn't work and an article I think
explains it. Have you tried before ??
But you didn't answer my general question...



Short answer: on Windows 2000, you can have two or more interfaces connected
to the same physical network and configured within the same subnet.

--
Dmitry Korolyov [[email protected]]
MVP: Windows Server - Active Directory


On a windows 2000 Server I know that I can't have two interfaces belonging
to the same subnet.

But what happens if I put the two interfaces in the same network e.g.
192.168.1.0 but with a different subnet mask for each interface? Will I have
communication between the two interfaces??

Probably this is a more general networking question but, can the following
hosts communicate without a router:
Host A - IP address: 192.168.1.1 and Subnet mask: 255.255.255.255
Host B - IP address: 192.168.1.2 and Subnet mask: 255.255.255.255

Thanks in advance.
Click to expand...


If you have hosts on different subnets then you need a router to
'route' between the subnets.

The above example would not work as the netmask only provides you with
one available address per subnet and as a router would need an
interface on the same subnet there is no address space to do this.

If you use netmask 255.255.255.252 you will have the following
addresses:
Network A - 192.168.1.0
Host A - 192.168.1.2
Router port A - 192.168.1.1
Broadcast address - 192.168.1.3

Network B - 192.168.1.4
Host B - 192.168.1.6
Router port B - 192.168.1.5
Broadcast address - 192.168.1.7

You can, of course, sub-divide the address space using different
subnet masks, for example network A 255.255.255.252 and network B
255.255.255.240 but you will need to be careful that you don't
overlap.

Have a look at this for calculating network masks

http://www.telusplanet.net/public/sparkman/netcalc.htm

Brian
 
Back
Top