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Conference decwet::windows-nt

Title:Windows NT
Notice:See note 15.0 for HCL location
Moderator:TARKIN::LIN.com::FOLEY
Created:Thu Oct 31 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6086
Total number of notes:31449

5843.0. "(U) How to configure 2 NIC card's same subnet addr" by TAINO::JRIVERA () Tue Mar 25 1997 15:09

    
    Hi!
    
    	We have a customer with Windows NT 4.0 and it has a class c block
    but with two segments. We  put a second card on the windows nt server
    but we only have one subnet address (Yes differents ip). These two
    segments are one 100baseT & one 10BaseT and are using the windows Nt as
    a router.
    
    	Questions?
    
    	How could I configure the windows-nt server with the same subnet
        address on both NIC cards to forward traffic from one segment to
        the other?
    
    	Regards
    
    	Jose Rivera
    	SPS Deparment
    	Digital Equipment Caribbean
    	DTN - 723-8311
    	Email - [email protected]
T.RTitleUserPersonal
Name
DateLines
5843.1BIGUN::nessus.cao.dec.com::MayneA wretched hive of scum and villainyTue Mar 25 1997 23:177
You can't. If you have two segments, you need two subnets, or you need a bridge 
(in which case you aren't routing).

You could subnet your class C, but I'm told that Windows NT can only route 
between A, B, and C class networks, so that wouldn't work either.

PJDM
5843.2Could I segment a class-c blockTAINO::JRIVERAWed Mar 26 1997 06:2922
    Hi!
    
    	I'm a little confuse here you said -
    >>> You could subnet your class C,
    >>> but I'm told that Windows NT can only route 
    between A, B, and C class networks, so that wouldn't work either.
    
    	If Windows NT could route a class c subnet and We have an entire
    class-c block.
    
    	Question:
    
    	If I have a class-c block could I segment this block in 2 or 3
    subnet using the subnet-mask ?
    
    	And if so could I then put both cards in the same class-c block but
    with different subnetmask to indify the segment to wich the card
    belogns and route ip within both segments?
    
    
    Josepc
    
5843.3SMURF::PBECKWho put the bop in the hale-de-bop-de-bop?Wed Mar 26 1997 07:146
    A class C network can be subnetted. But if (as .1 indicates he has
    heard) NT only supports routing between "full" networks and not
    between subnets within a Class (A, B, or C) network, then it
    wouldn't help your problem.
    
    
5843.4TAINO::JRIVERAWed Mar 26 1997 07:2731
    Could I then put them in the same class-c network but each card in
    different segments and everybody could then see everybody?
    
    If I put each card as a gateway to the router.
    
     Example:
    
    
    Workstation(A)       Server NT 4.0
      10BaseT
    (1.1.1.10)  -------- NIC(1) 
    Gateway(1.1.1.1)	(1.1.1.1)
    
                         NIC(2)     100BaseT    Workstation (B)
    			(1.1.1.2)---------------(1.1.1.11)Gway(1.1.1.3)
    				   \
    				    \             Router
    				     \------------(1.1.1.3)-----Internet
    
    Could everybody see the internet with this setup?
    
    
    
    
    
    
    
    
    
    
    
5843.5Don't think so...ALFSS1::HENRYBob HenryWed Mar 26 1997 08:3317
    I probably shouldn't jump in since I'm not really a networking expert
    but I don't think this will work.  I don't know the whole story here
    but wouldn't it be easier to put in a 10/100 bridge/switch?  In order
    for this to work the way you've drawn it, I think you'll need to 
    allocate a block of ip
    addresses (with the appropriate subnet mask) on the 10baseT side and
    then route between the 2 segments/subnets.  
    
    NT will route between subsets of a
    subnet (if that makes any sense); this is how an isp sells blocks of ip
    addresses to small offices or home lans.  I've connected several of
    these for people using either dial-up networking with modems or isdn
    adapters back to the isp.  You have to do some trickery with the route
    table but it works.  Most NT networking books (Mark Minasi's comes to
    mind) or the 4.0 server resource kit will give you some examples. 
    
    Good luck,