Tuesday, November 2, 2021

Where Would You Need DNS Anycast?

One of the underlying reasons for the October 2021 Facebook outage was an intricate interaction between BGP routing and their DNS servers needed to support optimal anycast configuration. Not surprisingly, it was all networking engineers' fault according to some opinions1

⁦‪There’s no need for anycast2/BGP advertisement for DNS servers. DNS is already highly available by design. Only network people never understand that, which leads to overengineering.

It’s not that hard to find a counter-argument3: while it looks like there are only 13 root name servers, each one of them is a large set of instances advertising the same IP prefix4 to the Internet.

source https://blog.ipspace.net/2021/11/dns-anycast.html?utm_source=atom_feed

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