1. 512を超える返答

フラグメント化の可能性

$ dig +dnssec notexist.ns.nic.cz @b.ns.nic.cz.

; <<>> DiG 9.12.1 <<>> +dnssec notexist.ns.nic.cz @b.ns.nic.cz.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 16141
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1232
;; QUESTION SECTION:
;notexist.ns.nic.cz.            IN      A

;; AUTHORITY SECTION:
nic.cz.                 1800    IN      SOA     a.ns.nic.cz. hostmaster.nic.cz. 1540890328 10800 3600 1209600 7200
b8qctk0jmb36ou2b4gfrukanfnei0a5r.nic.cz. 7200 IN NSEC3 1 0 10 EAB313873ED8F788 B9ATPHCOUB92HQMPCAG8FDDCKPQKJNFD
6fo2tl940nvm6du26ffshnvjqcr77f4s.nic.cz. 7200 IN NSEC3 1 0 10 EAB313873ED8F788 6IDNIF4SNC1VG947QDCOLTA138GGBBFH  A RRSIG
d3kmvq7fdhur0djrl3t93n85up1fkuc4.nic.cz. 7200 IN NSEC3 1 0 10 EAB313873ED8F788 D6F7EPGAJB2A4D6H6SDSE3EHJMAH8E1P  A AAAA RRSIG
nic.cz.                 1800    IN      RRSIG   SOA 13 2 1800 20181112100936 20181030080528 41076 nic.cz. U/Xfwu6ZenWvEo5uowiDVBwH65e/oA9itLtIqQsHcRk8xVpvZnODDsyg 4VJzRswQJIZS5v+N1sTEQgWTPifhuA==
b8qctk0jmb36ou2b4gfrukanfnei0a5r.nic.cz. 7200 IN RRSIG NSEC3 13 3 7200 20181112171153 20181030080528 41076 nic.cz. Pcll06nBZ93Dewo1CKXmu9/jGL+p9yuqyn7Y69q6cKMvVgCmBAtSMxFR 6y4P8SQPyQaxVVtdWDOyPf2CJbrt9A==
6fo2tl940nvm6du26ffshnvjqcr77f4s.nic.cz. 7200 IN RRSIG NSEC3 13 3 7200 20181112205425 20181030080528 41076 nic.cz. +KEx/m+ilMI+5t2pawsh7B7sEYoSvtQWAT+9HJIr9wBn9Bc3kaYf6an2 Ndzwms7PJ3LkV/S0gt/4pfeJcH0grA==
d3kmvq7fdhur0djrl3t93n85up1fkuc4.nic.cz. 7200 IN RRSIG NSEC3 13 3 7200 20181112200945 20181030080528 41076 nic.cz. R2M+SyzBiUhWFL8/Hmoe5fHDOy7vbapKn/4RaVWL2MzvrkUca+ce8cBg ei0ZQjipGsCgyIngc62qoeMfgwatLw==

;; Query time: 260 msec
;; SERVER: 194.0.13.1#53(194.0.13.1)
;; WHEN: Tue Nov 06 08:40:39 JST 2018
;; MSG SIZE  rcvd: 757

$ dig +dnssec xxxexist.ns.nic.cz @b.ns.nic.cz.

; <<>> DiG 9.12.1 <<>> +dnssec xxxexist.ns.nic.cz @b.ns.nic.cz.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58735
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1232
;; QUESTION SECTION:
;xxxexist.ns.nic.cz.            IN      A

;; AUTHORITY SECTION:
nic.cz.                 1800    IN      SOA     a.ns.nic.cz. hostmaster.nic.cz. 1540890328 10800 3600 1209600 7200
b8qctk0jmb36ou2b4gfrukanfnei0a5r.nic.cz. 7200 IN NSEC3 1 0 10 EAB313873ED8F788 B9ATPHCOUB92HQMPCAG8FDDCKPQKJNFD
esmfodnhgntpr63qmi99v1fg24sjs8q1.nic.cz. 7200 IN NSEC3 1 0 10 EAB313873ED8F788 F2LA41GFNF65SVPE5SN4JL10FA1C00LL  NS DS RRSIG
d3kmvq7fdhur0djrl3t93n85up1fkuc4.nic.cz. 7200 IN NSEC3 1 0 10 EAB313873ED8F788 D6F7EPGAJB2A4D6H6SDSE3EHJMAH8E1P  A AAAA RRSIG
nic.cz.                 1800    IN      RRSIG   SOA 13 2 1800 20181112100936 20181030080528 41076 nic.cz. U/Xfwu6ZenWvEo5uowiDVBwH65e/oA9itLtIqQsHcRk8xVpvZnODDsyg 4VJzRswQJIZS5v+N1sTEQgWTPifhuA==
b8qctk0jmb36ou2b4gfrukanfnei0a5r.nic.cz. 7200 IN RRSIG NSEC3 13 3 7200 20181112171153 20181030080528 41076 nic.cz. Pcll06nBZ93Dewo1CKXmu9/jGL+p9yuqyn7Y69q6cKMvVgCmBAtSMxFR 6y4P8SQPyQaxVVtdWDOyPf2CJbrt9A==
esmfodnhgntpr63qmi99v1fg24sjs8q1.nic.cz. 7200 IN RRSIG NSEC3 13 3 7200 20181112200824 20181030080528 41076 nic.cz. jc5lFWkrk+WTvq9T3BPuLHGQ9PUB/2tUv7xXCkMWNXPdRTu+K/efWMSi o/KomhofLE1bMsoIjqiUSBdxIdDxPQ==
d3kmvq7fdhur0djrl3t93n85up1fkuc4.nic.cz. 7200 IN RRSIG NSEC3 13 3 7200 20181112200945 20181030080528 41076 nic.cz. R2M+SyzBiUhWFL8/Hmoe5fHDOy7vbapKn/4RaVWL2MzvrkUca+ce8cBg ei0ZQjipGsCgyIngc62qoeMfgwatLw==

;; Query time: 263 msec
;; SERVER: 194.0.13.1#53(194.0.13.1)
;; WHEN: Tue Nov 06 08:44:16 JST 2018
;; MSG SIZE  rcvd: 757


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