The AS 7007 incident was a major disruption of the
Internet
The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, pub ...
on April 25, 1997, that started with a
router operated by
autonomous system 7007 (MAI Network Services, although sometimes incorrectly attributed to the Florida Internet Exchange) accidentally leaking a substantial part of its entire
routing table
In computer networking, a routing table, or routing information base (RIB), is a data table stored in a router or a network host that lists the routes to particular network destinations, and in some cases, metrics (distances) associated with th ...
to the Internet, creating a routing
black hole.
Probably because of a bug in the affected router, the routes leaked were deaggregated to
/24 prefixes, which were more specific than the routes originally present on the Internet, and had the
AS path rewritten to 7007, leading the
Border Gateway Protocol
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. BGP is classified as a path-vector routing protocol, and it make ...
(BGP) used by the Internet's routers to prefer the leaked routes. This was then exacerbated by other problems that prevented the routes from disappearing from other networks' routing tables, even after the original router that had sent them had been disconnected. The combination of these factors resulted in an extended disruption of operations throughout the Internet.
Analysis of this event led to major changes in Internet Service Providers' BGP operations intended to mitigate the effects of any subsequent similar events.
Murphy's Law Strikes Again: AS7007
/ref>
See also
* Route filtering
References
External links
*
Origin authentication in interdomain routing
Interdomain Routing Security
nanog mailing list archive: "7007 Explanation and Apology"
* ttps://www.noction.com/blog/bgp_security_announcing_prefixes_without_authorization BGP security: announcing prefixes without authorization
Routing
Internet architecture
1990s internet outages
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