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akbar@pinger $ perl HostSearcher.pl --tld ci --max_pings 2 --max_time 2 --max_hosts 100 ------------------------------------------------------------------------ Searching Google for hosts........Done ------------------------------------------------------------------------ Parsing the downloaded data for hosts.......Done ======================================================================== The initial parsed list consists of 98 nodenames A total of 96 unique nodenames were found ======================================================================== ======================================================================== Pinging candidate nodes ======================================================================== Pinging host primature.ci.....Failed Pinging host tchatche.ci.....Success!! IP-Address=81.199.127.114 Min-RTT=285.806 Country=(CI) City=Abidjan Lat/Long= -4.0281, 5.3411 Pinging host vin.ci.....Success!! IP-Address=64.187.108.201 Min-RTT=68.542 Country=(US) City=Miami Lat/Long= -80.1911, 25.7631 Pinging host www.ado.ci.....Success!! IP-Address=216.162.72.102 Min-RTT=91.041 Country=(CA) City=Canada Lat/Long= -73.5833, 45.5 Pinging host www.aeria.ci.....Success!! IP-Address=213.136.96.35 Min-RTT=237.664 Country=(CI) City=Abidjan Lat/Long= -4.0281, 5.3411 Pinging host www.ai3l.ci.....Success!! IP-Address=213.136.96.8 Min-RTT=244.688 Country=(CI) City=Abidjan Lat/Long= -4.0281, 5.3411 Pinging host www.aip.ci.....Success!! IP-Address=213.186.33.2 Min-RTT=147.856 Country=France(FR) City=Roubaix Lat/Long= 3.1667, 50.7 | | | | Pinging host www.uabobo.ci.....Success!! IP-Address=196.201.66.45 Min-RTT=537.522 Country=(CI) City= Lat/Long= -5, 8 Pinging host www.ucacie.ci.....Success!! IP-Address=213.136.96.34 Min-RTT=237.347 !!Duplicate DNS hostname, IP address already present in list!! Pinging host www.ucocody.ci.....Success!! IP-Address=212.37.221.34 Min-RTT=148.288 Country=France(FR) City=Paris Lat/Long= 2.3333, 48.8667 Pinging host www.uica.ci.....Success!! IP-Address=213.136.121.170 Min-RTT=280.823 Country=(CI) City= Lat/Long= -5, 8 Pinging host www.uvci.ci.....Success!! IP-Address=213.136.96.12 Min-RTT=237.011 !!Duplicate DNS hostname, IP address already present in list!! ======================================================================== A total of 42 nodes with unique ip addresses and satisying filter conditions(if any) were found ======================================================================== |
Criteria
We manually choose sites based on the following criteria:
- They are really in the country and not a proxy elsewhere (we use GeoIPTools to identify the country).
- GeoIPTools has a city for the site.
- The host is a web server - this often enables us to find out more about the site via the web.
- The site is an educational or government site (in that order of preference).
- Sites within a country are chosen for diversification, i.e. different cities, different uses (Education, Government, Commercial...).
- We choose sites that appear to have better connectivity (e.g.lower RTT).
- Where possible >= 2 sites/country.
Examples
- Republic of Congo: Illustrates the difficulty of finding www hosts in some countries.
- More examples can be found at http://www-iepm.slac.stanford.edu/pinger/hostsearcher.