German Internet Outage on November 27 Technical Analysis and Solution

On November 27 (Sunday), at around 17:00 (local time), Deutsche Telekom was hit by a cyberattack, resulting in more than 900,000 routers getting disconnected, as confirmed by the company. The outage lasted several hours. Later, the problems continued on Monday morning from 08:00. Besides network access, the affected routers are used by Deutsche Telekom customers for fixed telephony and TV services.