Debugging with mtr

We think the mtr tool offers a great way to test network speed, evaluate performance, and perform connection diagnostics. The mtr tool combines traceroute and ping programs in a single network diagnostic tool. The program's source and installation instructions live in GitHub.

While mtr provides a number of practical uses for network engineering needs, the following command works well:

$ mtr -c 20 -w -r www.example.com

Be sure to replace www.example.com with the hostname of the domain you're working with. The command will generate the network hops to the destination you specify, any packet loss experienced, and aggregate connection statistics.

For example, if we wanted to test the network connection from Fastly's San Francisco office to the CDN, we would use the above command for www.fastly.com. The following output would appear:

$ mtr -c 20 -w -r www.fastly.com
Start: Mon Feb 2 15:27:20 2015
HOST: test-local-machine.local Loss% Snt Last Avg Best Wrst StDev
1.|-- 10.100.20.2 0.0% 20 2.1 2.2 1.6 4.3 0.5
2.|-- ge-4-3-4.mpr4.sfo7.us.zip.zayo.com 0.0% 20 2.3 2.4 1.8 5.2 0.6
3.|-- ae5.cr2.sjc2.us.zip.zayo.com 0.0% 20 4.6 6.5 2.9 35.3 7.7
4.|-- ae10.mpr4.sjc7.us.zip.zayo.com 0.0% 20 4.7 4.8 3.6 14.5 2.3
5.|-- be6461.ccr21.sjc03.atlas.cogentco.com 5.0% 20 5.1 5.9 4.2 15.3 2.6
6.|-- fastly-inc.edge2.sanjose3.level3.net 0.0% 20 5.0 4.7 4.2 8.2 0.8
7.|-- ??? 100.0 20 0.0 0.0 0.0 0.0 0.0
8.|-- 23.235.47.184 0.0% 20 4.7 14.3 3.8 74.6 20.3
Was this guide helpful?

Do not use this form to send sensitive information. If you need assistance, contact support. This form is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.