[ SRE_ARENA ]
BGP & INTERNET ROUTING

The Duct Tape Holding the Internet Together.

Visualization: 1. Autonomous Systems (ASNs)
DOWNLOADING CONCEPT: 1. AUTONOMOUS SYSTEMS (ASNS)...
  • ↳The internet is not a single entity.
  • ↳It is a loose network of networks, called Autonomous Systems (AS).
  • ↳Comcast is an AS.
  • ↳AT&T is an AS.
  • ↳Amazon Web Services is an AS.
  • ↳Every AS is assigned a unique number (an ASN).
  • ↳To get traffic from a user on Comcast to a server on AWS, the packets must jump from one Autonomous System to another.
  • ↳They do this at physical data centers called Internet Exchange Points (IXPs) where the massive ISP routers physically plug into each other to 'peer' traffic.
▲ LIVE INCIDENTGlobal internet traffic to Cloudflare has suddenly dropped to zero.
sre@arena:~/bgp
sre@arena:~$ bgp_lookup show-routes --target 1.1.1.1