Hello. I found the slow response query at dns server. This query is server fail response. In reality, this query gets to response a server fail for foreign dns server.
For example, maincastad.com’s glue record has 3 name server, 5 ip address. All glue record dns is not response. So, this query responses to slow. Is it possible to cache and quick response like ncache(negative cache)? Thanks. $ dig @b.gtld-servers.net maincastad.com ; <<>> DiG 9.9.9-P5 <<>> @b.gtld-servers.net maincastad.com ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38238 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 5 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;maincastad.com. IN A ;; AUTHORITY SECTION: maincastad.com. 172800 IN NS ns1.site4now.net. maincastad.com. 172800 IN NS ns2.site4now.net. maincastad.com. 172800 IN NS ns3.site4now.net. ;; ADDITIONAL SECTION: ns1.site4now.net. 172800 IN A 198.98.124.111 ns1.site4now.net. 172800 IN A 72.26.101.2 ns2.site4now.net. 172800 IN A 209.132.245.131 ns2.site4now.net. 172800 IN A 23.89.199.119 ns3.site4now.net. 172800 IN A 208.118.63.170 ;; Query time: 5 msec ;; SERVER: 192.33.14.30#53(192.33.14.30) ;; WHEN: Mon Feb 13 08:54:22 KST 2017 ;; MSG SIZE rcvd: 178
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