IXP Country Jedi

Probe mesh measurements

This codebase contains a couple of scripts to make probe mesh measurements feasible/easy.

The way the scripts are used/tested is to first create a directory for your measurement campaign, and run the scripts as follows:

mkdir 'SE-2015-03'
cd SE-2015-03 
<create config.json file here>
<run scripts relative to current directory, ie. ../prepare.py ; 
../measure.py ...>

The scripts depend on this convention.

Dependencies on external python modules are in 'requirements.txt', so you can run

pip install -r requirements.txt

to fulfill these.

Before you use the scripts, create a config file specifying what mesh you'd want to do.

##config.json

This file contains base data used for creating measurements and analysing the results. It can contain various parts:

• country: ISO 2 letter code for the country under analysis, or list of countries under analysis (ie. NL, IT, CH);
• ixps: List of IXPs one wants to detect/report on;
• locations: List of cities on which probe selection will be based (if applicable)
• probetag: Probetag on which probe selection criteria is based.

examples are provided in the examples directory. It is mandatory to either have country , or probetag.
Without a locations section, the capital of country (or the first country, if country is a list) is used for probe selection (see below).

One can set an extra 'location-constraint' config key. The value of this configuration directive needs to be an integer. When this is set, the probe selection part of ixp-country-jedi will only select probes that are within 'location-constraint' kilometers from any of the given locations. This can be useful if you only want to measure a specific city. In that case, set the 'location'-list to that specific city, and set a 'location-constraint' to a reasonable value (for instance 50, so you'll cover 50 kilometers from the city centre).

Note: The interaction between various of the configuration settings hasn't been thoroughly tested, so beware of combining. What is known to work is probetag as a stand-alone probe selection option, and country is known to work well together with all other config options.

prepare.py

This script reads config.json and generates two output files:

1. basedata.json
2. probeset.json

For each one of the IXPs listed in config.json it will try to find the member ASNs.

Based on the country and locations specified it will do a probe selection. It will:

• only select public probes (because the measurements we are going to create will use their their public IP address);
• for every ASN, it will select up to twice the number of locations specified.

If an ASN hosts more than 2 probes, the selection will be a maximum of 2x the number of locations in config.json: the closest as well as the furthest probe from each location will be selected. Note that this can result in less than 2 times the number-of-locations probes per ASN even when there are more probes available in that ASN, because a single probe could be the furthest away from multiple locations.

In the preparation/data gathering phase this script uses the GeoNames service for geocoding. Please put a valid geonames username in ~/.geonames/auth.

for more information on GeoNames see http://www.geonames.org/export/web-services.html

measure.py

This script runs one-off measurements for the probes specified in probeset.json and stores their results in measurementset.json

This uses the RIPE Atlas measurement API for measurement creation, and it needs a valid measurement creation API key in ~/.atlas/auth .

For more information on RIPE Atlas API keys see https://atlas.ripe.net/docs/keys/

get-ips.py

This script gathers metadata for all the IPs in the collected data. This is done separately from the rest of the analysis-code because it is time-consuming and ideally is done pretty soon after running all the measurements. If done too soon, not all measurement results would be in yet, if done much later (think days) meta-data - like reverse hostname mapping - might have changed, so is don't get-ips a few minutes after measure.py. This step will create a file called ips.json-fragments file with reverse DNS lookups, ASNs and geoloc (via OpenIPMap, not MaxMind) of IPs encountered in the traceroutes.

get-measurements.py

This script fetches measurements (from measurementset.json) and does some initial analysis on them using information from config.json, basedata.json, probeset.json and ips.json-fragments. It creates a local results directory and outputs a single json file per measurement (analysed..json) which is a list of analysis results, one result per src/dst combination.

analyse-results.py

This script produces text and/or webpages with analysis and visualisation in a local analysis directory. For webpages, these need to be on an actual webserver for some of the javascript in them to work. One can easily create a local webserver that would work for this purpose like this:

cd analysis ; python -m SimpleHTTPServer 3333

and then pointing your browser at localhost:3333/ Note that some visualisations use libraries in a common directory located in the 'analysis' directory, so the webserver needs to run with the 'analysis'-directory (or lower) as root.

Templates (HTML,javascript,CSS) for webpages are in the templates directory and copied over each time the analyse-results.py script is run.

If you want to tweak the visualisations, tweaking them in the templates directory and then running the analyse-results.py script again will probably do what you want.