[Lilug-si-sig] When innocuous decisions go terribly, terribly wrong

[Jeff Goldschrafe]

tl;dr: Back in 2012, the IEEE started allocating MAC address ranges to vendors randomly instead of sequentially. The Cisco Nexus 9000 sees devices with a MAC beginning with the number 6 and, because of an unfixable ASIC misbehavior, believes them to be IPv6 frames and drops them (they’re malformed, when considered as IPv6 payloads). A $30,000 switch literally cannot deliver packets to MACs beginning with the number 6.

http://seclists.org/nanog/2016/Dec/29

-- 
Jeff Goldschrafe
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