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explanantion of pathping output required

Posted on 2006-06-07
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Last Modified: 2007-12-19
Hi

I have the following pathping output and i wanted some explanation of what the data means,
specifically

1) What does it mean when the RTT column shows --- , i.e. hops 7, 8, 9, 11 and 12?
2) What does it mean when Source to Here Lost/Sent=Pct > 0, i.e. hop 1 and 3 but
    This Node/Link Lost/Sent=Pct is 0?
3) Is the 1% lost between hops 10 and 11 significant?

Computing statistics for 390 seconds...

            Source to Here   This Node/Link

Hop  RTT    Lost/Sent = Pct  Lost/Sent = Pct  Address

  0                                           XXXXXXXXXXXXXXXX[999.999.29.98]

                                0/ 100 =  0%   |

  1    0ms     2/ 100 =  2%     2/ 100 =  2%  XXXXXXXXXXXXXXXXXXX [999.999.151.5]

                                0/ 100 =  0%   |

  2   17ms     0/ 100 =  0%     0/ 100 =  0%  999.999.1.4

                                0/ 100 =  0%   |

  3   22ms     1/ 100 =  1%     1/ 100 =  1%  999.999.171.125

                                0/ 100 =  0%   |

  4   24ms     0/ 100 =  0%     0/ 100 =  0%  999.999.154.126

                                0/ 100 =  0%   |

  5   28ms     0/ 100 =  0%     0/ 100 =  0%  999.99.4.153

                                0/ 100 =  0%   |

  6   33ms     0/ 100 =  0%     0/ 100 =  0%  999.999.4.138

                                0/ 100 =  0%   |

  7  ---     100/ 100 =100%   100/ 100 =100%  999.999.43.49

                                0/ 100 =  0%   |

  8  ---     100/ 100 =100%   100/ 100 =100%  999.999.105.177

                                0/ 100 =  0%   |

  9  ---     100/ 100 =100%   100/ 100 =100%  999.999.105.178

                                0/ 100 =  0%   |

 10   39ms     0/ 100 =  0%     0/ 100 =  0%  r-icr2rzvo-2-68.pdb.sbs.de [999.999.2.70]

                                1/ 100 =  1%   |

 11  ---     100/ 100 =100%    99/ 100 = 99%  999.999.65.214

                                0/ 100 =  0%   |

 12  ---     100/ 100 =100%    99/ 100 = 99%  999.999.1.167

                                0/ 100 =  0%   |

 13   38ms     1/ 100 =  1%     0/ 100 =  0%  XXXXXXXXXXXXXXXXXXX [999.999.12.71]



Trace complete.

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Question by:DLyall
2 Comments
 
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by:jhance
jhance earned 1000 total points
ID: 16851448
RTT = Round Trip Time.  The time it takes the ping packet to get to the destination and back.  This is an indication of the latency of the path.

Lost/Sent = ratio of lost to sent packets.  0/100 is perfect.  Out of 100 packets, none were lost.  100/100 is bad but depending on what is at that IP address, it may not respond to pings so the lost packets would be 100%.
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masnrock earned 1000 total points
ID: 16852265
1) See jhance's response.
2) This Node/Link Lost/Sent=Pct will tell you the rate that a link between two hops seems to be dropping packets. Don't worry about the Source to Here column, as it doesn't mean too much.
3) 1% loss is generally acceptable.... packets can and do get lost. However, you'll ideally want it to be no higher than 5%. (Obviously 0 is perfect, but this is an imperfect world)
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