<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Thanks Colin</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Its useful to know that there are discrepancies such as this as it will save me time in relooking at my data and calculations and wondering why its isnt making sense.</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> regards</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Paul</div> <div> <div id="appendonsend"></div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Colin Johnston <colinj@mx5.org.uk><br> <b>Sent:</b> 26 March 2021 08:16<br> <b>To:</b> Mccherry, Paul (Student) <p.mccherry@lancaster.ac.uk><br> <b>Cc:</b> Robert Kisteleki <robert@ripe.net>; ripe-atlas@ripe.net <ripe-atlas@ripe.net><br> <b>Subject:</b> Re: [atlas] [External] Re: Probe location obfuscation</font> <div> </div> </div> <div class="" style="word-wrap:break-word; line-break:after-white-space"><span class="" style="color:rgb(51,51,51); font-family:"Open Sans",Helvetica,Arial,sans-serif; font-size:13px; background-color:rgb(252,252,252)">2317 is actually 10 miles down the east lancs rd but configuration says manchester</span> <div class=""><font color="#333333" face="Open Sans, Helvetica, Arial, sans-serif" size="2" class=""><span class="" style="background-color:rgb(252,252,252)"><br class=""> </span></font></div> <div class=""><font color="#333333" face="Open Sans, Helvetica, Arial, sans-serif" size="2" class=""><span class="" style="background-color:rgb(252,252,252)">Col</span></font></div> <div class=""><font color="#333333" face="Open Sans, Helvetica, Arial, sans-serif" size="2" class=""><span class="" style="background-color:rgb(252,252,252)"><br class=""> </span></font> <div><br class=""> <blockquote type="cite" class=""> <div class="">On 26 Mar 2021, at 06:25, Mccherry, Paul (Student) <<a href="mailto:p.mccherry@lancaster.ac.uk" class="">p.mccherry@lancaster.ac.uk</a>> wrote:</div> <br class="x_Apple-interchange-newline"> <div class=""> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> Thanks Robert</div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <br class=""> </div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> </div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> I am using the probe estimated geolocations to validate a new active geolocation method I am formulating.</div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <br class=""> </div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> The probe I that I thought had an anomaly was in fact found to be within 1k distance of my estimated geo location using the new method. The original discrepancy was due to a number of factors that I had failed to accurately apply.</div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <br class=""> </div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> However, I have other probes that have similar but different issues and whilst I am working my way through these issues a<span class="" style="background-color:rgb(255,255,255); display:inline!important">ny additional information you can provide would be greatly appreciated. </span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important"><br class=""> </span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important">Regards</span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important"><br class=""> </span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important"><br class=""> </span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important">Paul McCherry</span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important">Phd Student</span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <span class="" style="background-color:rgb(255,255,255); display:inline!important">Lancaster University.</span></div> <div class="" style="font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> </div> <div class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none"> <div id="x_appendonsend" class=""></div> <div class="" style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"> <br class=""> </div> <hr tabindex="-1" class="" style="display:inline-block; width:454.71875px"> <div id="x_divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" class="" style="font-size:11pt"><b class="">From:</b><span class="x_Apple-converted-space"> </span>Robert Kisteleki <<a href="mailto:robert@ripe.net" class="">robert@ripe.net</a>><br class=""> <b class="">Sent:</b><span class="x_Apple-converted-space"> </span>25 March 2021 12:47<br class=""> <b class="">To:</b><span class="x_Apple-converted-space"> </span>Mccherry, Paul (Student) <<a href="mailto:p.mccherry@lancaster.ac.uk" class="">p.mccherry@lancaster.ac.uk</a>>;<span class="x_Apple-converted-space"> </span><a href="mailto:ripe-atlas@ripe.net" class="">ripe-atlas@ripe.net</a><span class="x_Apple-converted-space"> </span><<a href="mailto:ripe-atlas@ripe.net" class="">ripe-atlas@ripe.net</a>><br class=""> <b class="">Subject:</b><span class="x_Apple-converted-space"> </span>[External] Re: [atlas] Probe location obfuscation</font> <div class=""> </div> </div> <div class="x_BodyFragment"><font size="2" class=""><span class="" style="font-size:11pt"> <div class="x_PlainText">This email originated outside the University. Check before clicking links or attachments.<br class=""> <br class=""> Hi,<br class=""> <br class=""> On 2021-03-25 13:00, Ponikierski, Grzegorz via ripe-atlas wrote:<br class=""> > I would add to it additional problem that some hosts obfuscate probe<br class=""> > location even more. For example you can find probes which in reality are<br class=""> > located in US but are marked as CN or probes which are in reality in<br class=""> > Wisconsin but are marked in California. Of course these are extreme<br class=""> > cases. I guess most hosts just put a pin with probe location just<br class=""> > somewhere around where it's locate as long it's in the same city. I<br class=""> > don't remember, as a host of 3 probes, to get any precise<br class=""> > recommendations how to mark probe location. Personally I just put a pin<br class=""> > in city district where probe is locate.<br class=""> <br class=""> We don't have strict rules about precisely how the hosts should<br class=""> geolocate their probes -- and could not enforce those even if we had<br class=""> them. Instead we recommend doing this "roughly correct", which for some<br class=""> hosts means city / neighbourhood is good enough, for some others it's<br class=""> the exact spot of the utility box at home :-)<br class=""> <br class=""> > Can anyone confirm the geo-location obfuscation of probes as being up to<br class=""> > 1km as per<br class=""> ><span class="x_Apple-converted-space"> </span><a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fatlas.ripe.net%2Fabout%2Ffaq%2F%23are-the-locations-of-probes-made-public&data=04%7C01%7Cp.mccherry%40lancaster.ac.uk%7C7cd8b16f788e4ec1a61f08d8f02f722e%7C9c9bcd11977a4e9ca9a0bc734090164a%7C0%7C1%7C637523433859261128%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=pZMQ0hLVrR%2B7des1TMkWw31%2BTlH01IuEKWRMXU6wiOw%3D&reserved=0" originalsrc="https://atlas.ripe.net/about/faq/#are-the-locations-of-probes-made-public" shash="xa+GaDb+DJ21vp98sqniAFUnKx7OkJ9ut2dhXOSkKJnrSamHBnJ9peCWp0VDRQmh2ahrIfP94Mm4fDc6JrUg6u4iU2ajz/qo2N0RH3MGO8Mbgd/4zj3NqhLpbzHGCMzq5eBt4XVeea1nnm4t5Scs7q8aNm83a7rD5YDOaS4dNdA=" class="">https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fatlas.ripe.net%2Fabout%2Ffaq%2F%23are-the-locations-of-probes-made-public&data=04%7C01%7Cp.mccherry%40lancaster.ac.uk%7C0d707df0f3534cd8707008d8ef8c2bb3%7C9c9bcd11977a4e9ca9a0bc734090164a%7C0%7C1%7C637522732594157947%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ZRNBZBO61oUXTYZGVYNyfyNRG2J4sv4AIrchzrCitOg%3D&reserved=0</a><<a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__https%3A%2Fatlas.ripe.net%2Fabout%2Ffaq%2F*are-the-locations-of-probes-made-public__%3BIw!!GjvTz_vk!EWq0OCOmS-1Af9zWmGzygQZxC02O19msR11hqwe7X3bHqvxoqX8Tt17N3fDKNB4%24&data=04%7C01%7Cp.mccherry%40lancaster.ac.uk%7C7cd8b16f788e4ec1a61f08d8f02f722e%7C9c9bcd11977a4e9ca9a0bc734090164a%7C0%7C1%7C637523433859261128%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=duY0lwHdq5GaoI45c3xA7R1nSwfonw%2BEYjwGIzymatU%3D&reserved=0" originalsrc="https://urldefense.com/v3/__https:/atlas.ripe.net/about/faq/*are-the-locations-of-probes-made-public__;Iw!!GjvTz_vk!EWq0OCOmS-1Af9zWmGzygQZxC02O19msR11hqwe7X3bHqvxoqX8Tt17N3fDKNB4$" shash="TTS8v+o6CYpddclZaxmoLN2ZUycPED1oN3T4iAOJrN7z9tswnh9aXRiK3BFJYEYrilBUgA3KFhOK/06P4+4CAYMDpK7gBSZSqr6PXXmdP/Xu19O6b14BSVgcgkVqjvl07m518SxOFzlHX/eDUPTS1Hbhdt1Y/3CQJGFqISBXTCU=" class="">https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__https%3A%2Fatlas.ripe.net%2Fabout%2Ffaq%2F*are-the-locations-of-probes-made-public__%3BIw!!GjvTz_vk!EWq0OCOmS-1Af9zWmGzygQZxC02O19msR11hqwe7X3bHqvxoqX8Tt17N3fDKNB4%24&data=04%7C01%7Cp.mccherry%40lancaster.ac.uk%7C0d707df0f3534cd8707008d8ef8c2bb3%7C9c9bcd11977a4e9ca9a0bc734090164a%7C0%7C1%7C637522732594157947%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=VdT77jYEFo5pWuPHqRjnowZPIq9neOLHKc%2B47slBNI8%3D&reserved=0</a>><br class=""> ><br class=""> > I am a Phd student carrying out research on the RIPE atlas platform and<br class=""> > an early result seems to indicate 1 probe has an obfuscation of 10km<br class=""> > distance but this may be an anomaly or perhaps something not taken into<br class=""> > account as yet.<br class=""> <br class=""> We have a very simple algorithm that does the obfuscation consistently<br class=""> with a certain maximum distance added, which may not be precisely 1km.<br class=""> We can talk offline about the details if you're really interested in the<br class=""> precise method.<br class=""> <br class=""> Cheers,<br class=""> Robert</div> </span></font></div> </div> </div> </blockquote> </div> <br class=""> </div> </div> </div> </body> </html>