The next time someone needs you to fix a computer problem and asks what went wrong, simply give them this article's summary as the reason why, replacing "router" and "Internet" with the the defective part in question. You're also guarenteed to look a bit sharper, too.
"A bug by power supply vendor A (omitting a range check from a critical field in the configuration interface) tickled a bug from power supply vendor B (dropping BGP sessions when processing some ASPATH attributes with length very close to 256), causing a ripple effect that caused widespread global routing instability last week. The flaw lay dormant until one of vendor A's systems was deployed in an autonomous system whose ASN, modulo 256, was greater than 250. At that point, the power supply was one typo away from disaster. Other power supply vendors, who were not affected by the bug, happily propagated the trigger message to every vulnerable system on the planet in about 30 seconds. Few people appreciate how fragile and unsecured the power supply's trust-based critical infrastructure really is â" this is just the latest example."