3

For example, if I run this command against example.com, with mtr command, I always get 10% of loss, no matter how many time I run, why exactly is 10%?

mtr --report 192.0.43.10
HOST: localhost Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- ip-10-28-120-1.eu-west-1.  0.0%    10    0.5   1.8   0.4  11.4   3.4
  2.|-- ip-10-5-34-126.eu-west-1.  0.0%    10    0.4   2.5   0.4   8.9   2.9
  3.|-- 100.64.12.4                0.0%    10    0.5   0.6   0.4   0.7   0.1
  4.|-- 100.64.12.11               0.0%    10    0.5   0.6   0.4   0.9   0.1
  5.|-- ec2-79-125-1-98.eu-west-1  0.0%    10    0.8   0.7   0.6   0.8   0.1
  6.|-- 178.236.1.4                0.0%    10    0.8   0.8   0.6   0.9   0.1
  7.|-- 178.236.0.138              0.0%    10    1.3   1.4   1.3   1.6   0.1
  8.|-- 178.236.0.121              0.0%    10    1.4   1.7   1.3   4.2   0.9
  9.|-- 213.242.106.85             0.0%    10    1.7   1.6   1.4   1.8   0.1
 10.|-- ae-1-4.bar1.Dublin3.Level  0.0%    10    2.3   2.4   2.3   2.6   0.1
 11.|-- ae-12-12.ebr2.Paris1.Leve  0.0%    10   96.0  96.2  95.9  97.5   0.5
 12.|-- ae-42-42.ebr2.Washington1  0.0%    10   97.4  97.2  97.0  97.5   0.2
 13.|-- ae-62-62.csw1.Washington1  0.0%    10   98.3  99.3  98.1 104.0   2.0
 14.|-- ae-1-60.edge1.Washington1  0.0%    10   95.8 103.2  95.7 158.6  19.8
 15.|-- INTERNET-CO.edge1.Washing  0.0%    10  101.5 101.5 101.4 101.8   0.1
 16.|-- 43-10.any.icann.org       10.0%    10   99.1 102.1  98.2 107.2   3.8
4

The 43-10.any.icann.org may have the priority for ICMP echo requests used by mtr lowered. The mtr tools is not 100% reliable to measure packet losses. Try using the iperf tool instead that can use UDP datagrams instead of ICMP echo requests to measure packet loss.

  • 1
    mtr also has option (-u) to use UDP datagrams instead of ICMP echo requests – fpmurphy Feb 28 '13 at 15:08
2

There's actually a bug in mtr for report mode that mis counts the last packet. It's fixed in a newer version (mtr v0.80)

See: https://bugs.launchpad.net/ubuntu/+source/mtr/+bug/966065 https://bugzilla.redhat.com/show_bug.cgi?id=611739

  • Ten packets, one lost, 10% loss. – David Schwartz Mar 28 '14 at 22:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.