Server 2003 two nics two networks



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Server 2003 two nics two networks

Postby » Thu, 29 Jun 2006 06:57:20 GMT

We have multiple servers (2003) with two NICs.  In each machine, one
NIC is configured with a public IP and one with a 10.x.  Our lab
machines are all on the 10.x network.  The idea is that the lab
machines communicate via the 10.x to our servers.  However, they are
also supposed to be able to connec to the Net.  They go through a
router that has a private and a public interface for this purpuse.
However, I am finding that my servers are getting to portions (if not
all) of my public network via their private interfaces, through this
router, and on.  The effect - my router "poisons" my campus router such
that other computers on my public network cannot see my servers.  I
believe that what happens is that a computer on the public network goes
through our campus router to get to the server's public IP but the
campus router reports the MAC of my private router - it then discards
the traffic.  Anyhow, my assumption was that with any Windows Server
machine with two NICs with two networks would logically say: if this
packet is destined for 10.x go out my NIC with that network address.
If this packet is destined for a public IP go out my NIC with a public
IP address.  Is this logic wrong?  If so, what is the reason?  If my
logic is correct, what would cause my servers to violate this logic?  I
am more than willing to read whatever necessary if someone wants to
simply point me in the right direction.


Re: Server 2003 two nics two networks

Postby Doug Sherman [MVP] » Thu, 29 Jun 2006 10:20:22 GMT

This may simply be a default gateway issue.  The servers should be not be
configured with a 10.x default gateway - in fact, the 10.x NICs on the
servers should have no default gateway configured at all.

Doug Sherman

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