Dear all, I compilled and installed the BIND 9.10.0-P1 on my Debian Wheezy box. See following for detail:
------------------ werner@debian:~$ sudo named -V BIND 9.10.0-P1 <id:e94d8db1> built by make with '--prefix=/usr' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc/bind' '--localstatedir=/var' '--enable-threads' '--enable-largefile' '--with-libtool' '--enable-shared' '--enable-static' '--with-openssl=/usr' '--with-gssapi=/usr' '--with-gnu-ld' '--with-geoip=/usr' '--enable-ipv6' 'CFLAGS=-fno-strict-aliasing -DDIG_SIGCHASE -O2' compiled by GCC 4.7.2 using OpenSSL version: OpenSSL 1.0.1e 11 Feb 2013 ------------------ Now, I setting the prefetch in the named.conf.options by adding the follow line into it: ----------- prefetch 2 9; ------------ Then restart the named and test it by using the following command: --------------------- werner@debian:~$ dig ssh.sshcenter.info ; <<>> DiG 9.10.0-P1 <<>> ssh.sshcenter.info ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54538 ;; flags: qr rd ra; QUERY: 1, ANSWER: 15, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;ssh.sshcenter.info. IN A ;; ANSWER SECTION: ssh.sshcenter.info. 60 IN CNAME c-ssh.cloudkvm.net. c-ssh.cloudkvm.net. 60 IN A 23.94.104.29 c-ssh.cloudkvm.net. 60 IN A 199.119.224.224 c-ssh.cloudkvm.net. 60 IN A 23.226.226.124 c-ssh.cloudkvm.net. 60 IN A 204.44.87.100 c-ssh.cloudkvm.net. 60 IN A 192.3.23.197 c-ssh.cloudkvm.net. 60 IN A 173.254.237.179 c-ssh.cloudkvm.net. 60 IN A 96.44.134.231 c-ssh.cloudkvm.net. 60 IN A 23.90.4.124 c-ssh.cloudkvm.net. 60 IN A 23.92.50.22 c-ssh.cloudkvm.net. 60 IN A 107.150.4.170 c-ssh.cloudkvm.net. 60 IN A 199.233.236.200 c-ssh.cloudkvm.net. 60 IN A 69.197.147.93 c-ssh.cloudkvm.net. 60 IN A 162.211.227.83 c-ssh.cloudkvm.net. 60 IN A 192.227.161.20 ;; Query time: 1034 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Sun May 18 13:13:03 CST 2014 ;; MSG SIZE rcvd: 303 ----------------------- As you can see, it takes 1034 msec for the first query. According to my understanding of the prefetch option, if I enabled it, then after the first query of a site, then it will always updated automatically into the cache of bind. So I will always obtain a 0 msec query time for that site after the first query. But for my above case, after 60 seconds, if I do the same query, I will get the following results: ----------------------------- werner@debian:~$ dig ssh.sshcenter.info ; <<>> DiG 9.10.0-P1 <<>> ssh.sshcenter.info ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41322 ;; flags: qr rd ra; QUERY: 1, ANSWER: 15, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;ssh.sshcenter.info. IN A ;; ANSWER SECTION: ssh.sshcenter.info. 60 IN CNAME c-ssh.cloudkvm.net. c-ssh.cloudkvm.net. 58 IN A 23.90.4.124 c-ssh.cloudkvm.net. 58 IN A 192.3.23.197 c-ssh.cloudkvm.net. 58 IN A 192.227.161.20 c-ssh.cloudkvm.net. 58 IN A 23.226.226.124 c-ssh.cloudkvm.net. 58 IN A 23.92.50.22 c-ssh.cloudkvm.net. 58 IN A 199.119.224.224 c-ssh.cloudkvm.net. 58 IN A 23.94.104.29 c-ssh.cloudkvm.net. 58 IN A 199.233.236.200 c-ssh.cloudkvm.net. 58 IN A 96.44.134.231 c-ssh.cloudkvm.net. 58 IN A 162.211.227.83 c-ssh.cloudkvm.net. 58 IN A 107.150.4.170 c-ssh.cloudkvm.net. 58 IN A 173.254.237.179 c-ssh.cloudkvm.net. 58 IN A 204.44.87.100 c-ssh.cloudkvm.net. 58 IN A 69.197.147.93 ;; Query time: 2186 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Sun May 18 13:16:50 CST 2014 ;; MSG SIZE rcvd: 303 ----------------------------- As you can see, the query time is 2186 msec instead of 0 msec. Any hints on this issue? Regards -- Hongyi Zhao <hongyi.z...@gmail.com> Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences GnuPG DSA: 0xD108493
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