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What Ping can tell you

  • Ping places a unique sequence number on each packet it transmits, and reports which sequence numbers it receives back. Thus, you can determine if packets have been dropped, duplicated, or reordered.
  • Ping checksums each packet it exchanges. You can detect some forms of damaged packets.
  • Ping places a timestamp in each packet, which is echoed back and can easily be used to compute how long each packet exchange took - the Round Trip Time (RTT).
  • Ping reports other ICMP messages that might otherwise get buried in the system software. It reports, for example, if a router is declaring the target host unreachable.
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Page last modified on August 11, 2007, at 06:17 AM