[dns-operations] DNS flag day 2020: Recommended EDNS buffer size discussion

Jerry Lundström jerry at dns-oarc.net
Mon Sep 2 06:52:36 UTC 2019

Hi all,

I have opened an issue that will serve as a public, open to all, 
discussion forum for what the recommended EDNS buffer size should be for 
DNS Flag Day 2020.


> Please note that the exact recommended EDNS buffer sizes have not been agreed upon, the current ballpark around 1200 (1220, 1232, …) is to limit the risk of fragmentation in IPv6.

Note that most of the text on dnsflagday.net mentions 1220 bytes.

Please feel free to voice your opinion!


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