DNS/実装/KnotDNSresolver/libknotについて、ここに記述してください。
https://github.com/craftext/Knot-DNS/blob/master/src/libknot/
https://github.com/craftext/Knot-DNS/blob/master/src/libknot/edns.c
config: add option for maximal udp payload https://gitlab.labs.nic.cz/labs/knot/commit/c1500105faba6e3e8d5c4f89085bf281b4189512
+max-udp-payload { lval.t = yytext; return MAX_UDP_PAYLOAD; }
"bufsize must be within <1220, 65535>" という制限もあるようだ。（なぜ）
1. Knot DNS configuration
https://www.knot-dns.cz/docs/1.6/html/reference.html
-- ToshinoriMaeno 2016-02-07 16:08:20