I have been recently trying out mtr
to get network congestion pain points. Following are sample mtr
requests
Example 1
$ mtr --report -c 10 my.example.com
HOST: ansh0l-Lenovo Loss% Snt Last Avg Best Wrst StDev
1.|-- 192.168.0.1 0.0% 10 1.3 5.2 1.3 22.4 8.0
2.|-- 10.10.20.1 0.0% 10 3.9 2.5 1.6 4.6 1.2
3.|-- NSG-Static-*.*.*.* 10.0% 10 7.7 6.7 5.1 10.1 1.5
4.|-- AES-Static-*.*.*.* 10.0% 10 46.3 48.5 46.2 53.8 2.6
5.|-- s38895.sgw.equinix.com 0.0% 10 50.3 47.9 46.1 50.3 1.5
6.|-- 203.83.223.2 0.0% 10 49.0 48.7 47.0 51.1 1.2
7.|-- 203.83.223.23 0.0% 10 47.8 48.1 46.9 50.0 1.0
8.|-- ec2-175-*-*-*.ap-sou 0.0% 10 47.7 49.0 47.6 55.8 2.5
9.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
Example 2
$ mtr --report -c 100 my.example.com
HOST: ansh0l-Lenovo Loss% Snt Last Avg Best Wrst StDev
1.|-- 192.168.0.1 2.0% 100 5.5 3.2 1.2 94.6 9.8
2.|-- 10.10.20.1 3.0% 100 4.3 3.9 1.5 160.5 16.3
3.|-- NSG-Static-*.*.*.* 3.0% 100 9.9 8.1 4.3 99.0 9.8
4.|-- AES-Static-*.*.*.* 3.0% 100 48.6 48.9 45.9 137.0 9.4
5.|-- s38895.sgw.equinix.com 5.0% 100 46.7 49.6 45.5 155.6 11.5
6.|-- 203.83.223.2 2.0% 100 52.4 53.0 46.5 213.3 20.8
7.|-- 203.83.223.23 4.0% 100 49.1 50.0 46.2 145.6 11.5
8.|-- ec2-175-*-*-*.ap-sou 5.0% 100 49.3 50.8 46.4 169.6 12.8
9.|-- ??? 100.0 100 0.0 0.0 0.0 0.0 0.0
Questions:
Is Packet drops at HOST n = Sum of Packet drops for packets sent exclusively for HOST n? How safe is it to assume, that packets sent to say HOST 7, would have had the same previous hops?
In Example 1, At HOST 3 and 4, packet loss is same (10%). Is it safe to assume that all packet loss has thus happened at node 3?
In Example 1. When there is a packet loss at HOST 4 for 10%, shouldn't the next hops also be getting affected in terms of performance? If I have a 10% packet loss in one of the intermediate node, the nodes after it should also experience some packet loss, right?
In Example 2, some nodes have higher StDev. Should these be interpreted as points of unreliability?