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Admin Know-IT-All Question #23

Admin Know-IT-All Question #23

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"It is inaccurate to say that I hate everything. I am strongly in favor of common sense, common honesty, and common decency. This makes me forever ineligible for public office."

- H. L. Mencken

Today's Know-IT-All answer is:
b. Add a DWORD value named 'DisableDHCPMediaSense' to the registry

Learn more:

Windows 2000's TCP/IP network stack contains a little-known feature that can sometimes cause more problems than it solves. This feature, called "Media Sensing," allows Windows to detect whether or not a network cable is plugged into a NIC.

If a cable is physically plugged into the adapter (and attached at the other end to a network device as well), Windows refers to this as the network media being in a "link state." Almost all network devices have an LED that indicates when the network media is in a link state (usually with a label that says, conveniently enough, "Link"). If the network cable is unplugged, Media Sensing kicks in and removes the bound protocols from the adapter until the media is re-inserted. This is done so that the rest of the system will know that this particular network interface is not to be used.

However, there are circumstances where this sort of thing can be counterproductive. For instance, some NICs do not correctly report the link state back to the PC or to Windows. This is usually due to a problem with the NIC's driver or the firmware on the NIC itself. Sometimes this can be fixed with an upgraded driver or firmware, but this is often slow to come. Another place where this can be problematic is with wireless adapters, which may report a dropped link prematurely when signal strength dips temporarily, and can cause a wireless adapter to appear to be failing randomly.

If this quiz has left you yearning for more information, please check the links below for related articles and tips:

>> Read Serdar Yegulalp's full article entitled: Disable media sensing.

>> Learn how to disable unused adapters.

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