Client side errors

Example of a case where an ISP accidentally released different internet routes. Google customers couldn’t reach google in this case. This was a result of a BGP leak. Border gateway protocol is a routing protocol that connects the entire internet. In a LAN, routing is easy, but as the network grows, it gets complicated.

Thus for routing in the internet, there are special methods. Large organisations and ISPs manage internet connectivity for multipl network sites and locations. Often called Autonomous Systems.

One AS handles network traffic inside it and the BGP router manages the inbound and outbound traffic to that network. Each BGP router contains routing tables. It allows BGP to find the best path over the internet to send the packet to its destination. But a leaked route can occur when an autonomous system propagates some routing announcements beyond their intended scope.

On 12/11/2018, a BGP leak impacted clients worldwide, including Google, Meta and Amazon. Big story. CIDR ranges announced to the public internet incorrectly.