---
title: Debugging with mtr
summary: null
url: >-
  https://www.fastly.com/documentation/guides/full-site-delivery/performance/debugging-with-mtr
---

We think the [mtr](https://www.bitwizard.nl/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](https://github.com/traviscross/mtr).

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

```term copy
$ 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:

```term nolinenums
$ 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
```