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Windows Server® 2008 Networking and Network Access Protection (NAP) by Microsoft Networking Team, Tony Northrup, Joseph Davies

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Troubleshooting

This section provides a brief overview of the troubleshooting tools built into Windows Server 2008.

ARP

Computers use the protocol ARP (discussed earlier in this chapter) to determine the MAC address associated with an IP address on the local subnet. Administrators use Arp (Arp.exe), the command-line tool, to view or clear a computer’s ARP cache.

Problems with ARP are rare. The most common problem occurs when an administrator changes the network adapter in a server, or a backup server in a cluster comes online and clients have the old network adapter’s MAC address cached. In that scenario, clients will not be able to connect to the server until the cached ARP entry expires or the client computer receives the updated MAC address in ...

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