Microsoft KB Archive/156165

= ICMP Time Stamp Not Supported =

Article ID: 156165

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q156165



SUMMARY
Microsoft Windows NT does not support the Internet Control Message Protocol (ICMP) time stamps fields as described in RFC 792.



MORE INFORMATION
Although Packet Internet Groper (PING) supports time stamping (ping -s) with ICMP Type 13 for the time stamp message, and ICMP Type 14 for the time stamp reply message, it does not use the ICMP time stamp field format. This is described in RFC 792:

The Originate Timestamp is the time the sender last touched the message before sending it, the Receive Timestamp is the time the echoer first touched it on receipt, and the Transmit Timestamp is the time the echoer last touched the message on sending it.

These time stamps can be used to estimate the delay between hosts and they can be used to synchronize the clocks on the hosts. According to RFC 1122, ICMP time stamps are optional.

Keywords: kbnetwork KB156165

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