Speakers
Description
Recent experience changing delegations for an akamai domain resulted in some unexpected outcomes and useful observations. To improve IPv6 reachability we recently updated delegations for a widely used domain, adding glue records.
Although it resulted in a DNS record size beyond 1223 bytes experienced team members conferred and felt the presence of numerous RFCs specifying the use of TCP for oversize answers would mitigate any potential issues.
What we discovered is while most resolvers switch to TCP because of the popularity of our domains there was measurable stress to certain nameservers.
In this talk we’ll explore what was changed, what should have happened, what actually happened, and how resolver setups affected these failures. And hopefully we can start a discussion about new best practices to prevent a recurrence!
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