TTL is directed by the authoritative zone. Changing TTL can break DNS features like DNS Failover or load balancing on websites.
Example: 300 seconds TTL for the A record desky1:~# dig google.com ; <<>> DiG 9.7.0-P1 <<>> google.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51279 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 0 ;; QUESTION SECTION: ;google.com. IN A ;; ANSWER SECTION: google.com. 300 IN A 209.85.195.104 ;; AUTHORITY SECTION: google.com. 108867 IN NS ns1.google.com. google.com. 108867 IN NS ns4.google.com. google.com. 108867 IN NS ns3.google.com. google.com. 108867 IN NS ns2.google.com. ;; Query time: 139 msec ;; SERVER: 10.0.51.1#53(10.0.51.1) ;; WHEN: Wed Jun 9 10:17:25 2010 ;; MSG SIZE rcvd: 116 ~ Andrew "lathama" Latham lath...@gmail.com * Learn more about OSS http://en.wikipedia.org/wiki/Open-source_software * Learn more about Linux http://en.wikipedia.org/wiki/Linux * Learn more about Tux http://en.wikipedia.org/wiki/Tux 2010/6/9 José Enrique Galiano <enri...@get.mrn.tur.cu>: > Necesito que mi servidor actualice la cache dns o limpiarla completamente, > si alguien puede ayudarme con eso, estoy usando bind9 y Ubuntu server 9.10. > > > > Saludos > >