DNS/dns-operations/2019について、ここに記述してください。
https://lists.dns-oarc.net/pipermail/dns-operations/2019-January/018259.html
Verisign TLDs, some other servers may trim critical glue from very large referrals Matt Nordhoff lists at mn0.us Fri Jan 4 12:33:47 UTC 2019
$ dig +bufsize=512 +dnssec +norecurse @b.edu-servers.net chattanoogastate.edu
1. 512
https://lists.dns-oarc.net/pipermail/dns-operations/2019-January/018270.html
Some authoritative servers honor ICMP requests to lower the path MTU to very small values (which is why I think a client-side workaround is rather incomplete). 512 is just the lowest value you can use.
> Also, the proper protection against the Shulman fragmentation attack > is DNSSEC.
This is not something a CA can enable, though.
Thanks, Florian
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