All posts by Doug Royer

When Routes Go Wrong: Solving BGP AS-Path Prepending Errors

Posted by on October 21st, 2014
November 10th, 2017

One scenario we captured and demonstrated during Networking Field Day 8 involved a BGP change at Country Financial. Follow along with this interactive share link if you would like to see the data for yourself. Around 17:25 UTC our cloud agents started alerting to connection issues with Country Financial’s website. We saw a dip in availability and alerting on this test for over an hour.… Read More »

Using ThousandEyes to Analyze a DDoS Attack on GitHub

ThousandEyes monitoring Github during DDoS attack
Posted by on December 18th, 2013
March 1st, 2018

On August 15th 2013 a DDoS attack targeted ThousandEyes was monitoring GitHub through public agents before and during the attack and we captured the coordinated effort by GitHub, Rackspace and their ISPs to fend off the attack. While multiple ISPs were involved in the effort, for the sake of simplicity we will focus primarily Level 3 Communications, and AboveNet. They used different techniques to counter the attack and ThousandEyes Deep Path Analysis helped us understand how the attack and defense evolved over time.… Read More »