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Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP
      9  XI  TCP/IP Network Diagnostic Utilities

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ARP (Address Resolution Protocol)
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WINIPCFG
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IPCONFIG

IPCONFIG is an executable (.exe) program. It displays the TCP/IP settings and diagnostic data for NT computers. While there are several options available, the command of most interest is IPCONFIG /ALL that displays the IP address, subnet mask, default gateway, WINS, and DNS configuration. If DHCP is used, the time the lease was last renewed and when it is due to die, (expire). By default, IPCONFIG reports the most popular settings for all adapters. The /ALL switch gives you all information for all adapters. You can then check this information against what you expect it to be.

If you’re using DHCP and some or all of the information is wrong, you probably have an error in your DHCP configuration on the server, rather than on the individual client PC. If you’re using DHCP and the computer’s IPCONFIG output doesn’t list the correct information, another possibility is that there is a router between that computer and the DHCP server that is not BOOTP-compliant.

TCP/IP Configuration and DHCP

If you’re using DHCP to manage client TCP/IP configuration information, and a host is not properly receiving its configuration information, check to make sure that there is not a non-BOOTP-compliant router (also known as a non-RFC 1314 compliant router) between the client computer and the DHCP server.


If you’re not using DHCP, then perhaps a typo was made when entering the configuration information for that client. Check the TCP/IP configuration settings.

To use IPCONFIG, type IPCONFIG using the appropriate switches at the Command Prompt.


Previous Topic/Section
ARP (Address Resolution Protocol)
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WINIPCFG
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