1. DNS/EDNS/letsencrypt
について、ここに記述してください。
詳細はこちらへ: DNS/FCP/Let's_Encrypt
2018-10-03 Mitigating DNS fragmentation attack
EDNS Buffer Size Changing to 512 Bytes
Summary
As of November 15th, 2018 our DNS resolvers (both staging and production) advertise an EDNS reassembly buffer size of 512 bytes.
This change should not require any adjustment by subscribers.
In practical terms, we set edns-buffer-size: 512 in our Unbound configuration 66.