On Nov 29, 2012, at 3:34 PM, Jose Manuel Delgado G. wrote: > about the other question, as to reduce the response time of my server when > the domain does not exist?
BIND implements negative caching of NXDOMAIN responses: % dig www.does.not.exist. @localhost [ ... ] ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 4942 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.does.not.exist. IN A ;; AUTHORITY SECTION: . 10800 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2012112901 1800 900 604800 86400 ;; Query time: 360 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Nov 29 18:35:52 2012 ;; MSG SIZE rcvd: 111 % dig www.does.not.exist. @localhost [ ... ] ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 55697 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.does.not.exist. IN A ;; AUTHORITY SECTION: . 10789 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2012112901 1800 900 604800 86400 ;; Query time: 1 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Nov 29 18:36:03 2012 ;; MSG SIZE rcvd: 111 Regards, -- -Chuck _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users