In a previous blog series about interfacing with your ISP, I mentioned tools that Internet Service Providers (ISPs) have, such as looking glasses and route servers, that can be used to verify their policies. In this blog post, I want to examine some of those tools, but primarily I want to show how prefixes are propagating across the Internet.
The question of prefix propagation comes up often when discussing how to develop an IPv6 address plan. What happens if an organization gets Provider Independent (PI) space from a registry and then tries to advertise that prefix, or a smaller portion of that prefix, in a different region? Will ISPs in that region filter the non-regional prefix? Will they let the aggregate pass, but not the more specific prefixes? Read More »