cn zone: The server(s) were not responsive to queries over UDP. See RFC 1035, Sec. 4.2. (2001:dc7:1::1)
edu.cn zone: The server(s) were not responsive to queries over TCP. See RFC 1035, Sec. 4.2. (166.111.8.30, 202.38.109.35, 2001:250:c006::35)
edu.cn/SOA: No response was received from the server over TCP (tried 3 times). See RFC 1035, Sec. 4.2. (166.111.8.30, 202.38.109.35, 2001:250:c006::35, TCP_-_EDNS0_4096_D_N)
edu.cn/MX has errors; select the "Denial of existence" DNSSEC option to see them.
y18ux.gcnar.edu.cn/A has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (8)
. to cn: Authoritative AAAA records exist for ns.cernet.net, but there are no corresponding AAAA glue records. See RFC 1034, Sec. 4.2.2.
. to cn: The glue address(es) for ns.cernet.net (202.112.0.44) differed from its authoritative address(es) (103.137.60.44, 202.112.0.44). See RFC 1034, Sec. 4.2.2.
edu.cn/CDS: The contents of the DS RRset are inconsistent with those of the CDS RRset. See RFC 7344, Sec. 3, RFC 7344, Sec. 5.
edu.cn/DS (alg 8, id 15397): DNSSEC implementers are prohibited from implementing signing with DS algorithm 1 (SHA-1). See RFC 8624, Sec. 3.2.
edu.cn/DS (alg 8, id 15397): DNSSEC implementers are prohibited from implementing signing with DS algorithm 1 (SHA-1). See RFC 8624, Sec. 3.2.
edu.cn/DS (alg 8, id 15397): DS records with digest type 1 (SHA-1) are ignored when DS records with digest type 2 (SHA-256) exist in the same RRset. See RFC 4509, Sec. 3.
edu.cn/DS (alg 8, id 15397): DS records with digest type 1 (SHA-1) are ignored when DS records with digest type 2 (SHA-256) exist in the same RRset. See RFC 4509, Sec. 3.
edu.cn/SOA: No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size. See RFC 6891, Sec. 6.2.6. (202.38.109.35, UDP_-_EDNS0_4096_D_KN_0x20)