On October 21, 2016, Dyn, a respected provider of managed internet domain name services, suffered a major Distributed Denial of Service (DDoS) attack that significantly disrupted internet services worldwide. The attack, executed using a Mirai botnet, overwhelmed Dyn's DNS servers, causing widespread DNS errors that affected numerous companies and services reliant on Dyn for domain name resolution. The incident underscored the vulnerability of relying on a single DNS provider, prompting some companies to switch providers or adopt multiple DNS providers to ensure redundancy and mitigate single points of failure. In response, Dyn and other stakeholders have been pursuing enhanced protective measures and collaborative efforts to strengthen DNS reliability. The event highlighted the importance of robust DNS configurations, including the use of longer TTL settings to alleviate immediate impacts during DNS outages. Additionally, Gremlin offers tools to simulate DNS outages, allowing companies to test and improve their systems' reliability against such disruptions.