Practical BGP

Safety Nets

There are a number of common filters all autonomous systems should place on their borders with other autonomous systems to prevent various sorts of invalid information from making it into or out of their networks. These filters act as safety nets against varying forms of attacks and misconfigurations that can occur from time to time on a network as large as the Internet, and they are also useful to protect your network in private peering relationships outside the context of the Internet.

Acceptable Advertisement Length

Normally, there is no reason to accept routes with very short or very long prefix lengths. When peering to another private network (such as peering to another company for directly exchanging access to servers in a partnership ...