Re: Same IP for 2 NICs on 1 computer
From: Ed Horley (no-spamed-usergroups1_at_yahoo.com)
Date: 12/07/04
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Date: Mon, 6 Dec 2004 17:40:00 -0800
Problem lies for the host computer with connections in both networks. If
there are hosts on both sides of each network segment then how will the
server know which interface to forward the traffic through? Causes some
problems in terms of arp/rarp for the host. Wouldn't recommend trying this.
You can however put a simple router with NAT on one segment and create a
little mini segment between the router and the host server. Then simply
build a one-to-one NAT translation on the router to you new segment with the
mapping as the same IP address as your other segment. You can do this
rather easily, problem is maintaining the NAT translations. You can do it
dynamic but it depends on your needs and what requirement you have for
connectivity.
HTH,
Ed Horley
Microsoft MVP Server-Networking
"dimaki" <anonymous@discussions.microsoft.com> wrote in message
news:104401c4dbe7$73bc8700$a501280a@phx.gbl...
> Thank you for your reply.
>
> I want to point out that these two networks are physically
> disjoint. Yes, they fall within the same subnet range, but
> the computers from one network cannot communicate with
> computers from the other network and their IP addresses
> would not overlap, except of course for this single
> computer which is on both of them. Is this still a problem
> for this one computer? Clearly it is not a problem for the
> rest of the computers on these 2 networks, since there
> doesn't need to be communication between the 2 networks
>
>>-----Original Message-----
>>Not only can you not do that,...even with different IP#s,
> they are not
>>supposed to be from the same subnet.
>>
>>175767 - Expected Behavior of Multiple Adapters on Same
> Network
>>http://support.microsoft.com/default.aspx?scid=kb;EN-
> US;175767
>>
>>--
>>
>>Phillip Windell [MCP, MVP, CCNA]
>>www.wandtv.com
>>
>>"dimaki" <anonymous@discussions.microsoft.com> wrote in
> message
>>news:18e501c4dbe2$b710f450$a301280a@phx.gbl...
>>> Hi,
>>> Is it OK for a single computer with several network
> cards
>>> to have the same static IP address and subnet mask for
>>> both of these cards. The cards connect the computer to
> two
>>> separate disjoint networks which would not have
> duplicate
>>> IP addresses for any of the computers on these networks
>>> except for this one computer. This computer does not act
>>> as a router. Would this kind of a setup be problematic
> in
>>> any way for the computer in question?
>>>
>>> Thank you for replies
>>
>>
>>.
>>
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