process for selecting an exit interface

Posted on 2003-03-06
Medium Priority
Last Modified: 2010-03-19
A colleague asked me this. He has a w2k box with two nics and a modem all actively connected to an ISP. If he does a telnet session to a remote IP, how is the exit interface determined? Another words, does a broadcast get sent out all interfaces initially or does one NIC or the modem connection take priority somehow?
Question by:ednie
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lrmoore earned 200 total points
ID: 8080320
A simple C:\>route print
will display the default gateway interface. Only one will be active at any given time. The one with the lowest metric will be the prefered route for all packets destined to any network that is not listed in the route table with a specified gateway.

Expert Comment

ID: 8081105
It acctually has nothing to do with metrics, if you attempt to to a telnet to a remote IP you machine looks at the IP address, if it does not reside on you local network it will send it to its default gateway, the gateway will then determine if it has a path to the network if not it will send it to it default gateway, when you do a route print you will see
Active Routes:
Network Destination Netmask    gateway   Interface  Metric       20

what the basically means is "for all unknown networks send to the gateway"

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