two NICS

P

picasso

Has anybody seen microsoft white paper (or any microsoft
paper)on why two NICs on a system should be in a different
subnets?
 
S

Steve Duff [MVP]

You don't really need a long paper on this one.

Just ask yourself the question, which is: if you have two
adapters on the same network, which one is Windows supposed to
use for outgoing data to that network?

The answer is that it picks one or the other (based on binding order) --
which of course means there isn't a lot of point to the other one.
Incoming data will come in based on whatever workstations
think the IP address is -- which again will usually be one or the other
based on B-node, WINS, DNS, hosts, whatever. You can play
some configuration games to try to statically load-balance, but overall
there isn't much point.

There are adapters that do teaming or load balancing or
failover, and of course there is Cluster Server, but otherwise on
an IP network there really isn't much good to flow from that configuration.

Steve Duff, MCSE
Ergodic Systems, Inc.
 

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