On Tuesday 06 November 2007 05:36, G T Smith wrote: > James Knott wrote: > > Damon Register wrote: > >> ... > >> > >> I noticed that no one else has mentioned this so I would like to > >> add a suggestion. One of our sysadmins here at work tells me > >> that good time is important to DNS servers so he suggested just > >> using the ISP's DNS server for your NTP server. Anyone else > >> have any comments on that? > > > > Aside from the fact that my ISP doesn't provide NTP on the DNS > > server, why is DNS time so critical? DNS is simply a database > > lookup function. > > But are not inter DNS server updates time stamped?... I would expect > a DNS server to reasonably well time synchronised... but I would be > surprised it acted as an ntp server as well...
I doubt DNS aging rules need millisecond-level precision and accuracy to operate properly or reliably. NTP is a high-precision, high-accuracy time protocol. From Wikipedia: -==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==- NTP uses Marzullo's algorithm with the UTC time scale, including support for features such as leap seconds. NTPv4 can usually maintain time to within 10 milliseconds (1/100 s) over the public Internet, and can achieve accuracies of 200 microseconds (1/5000 s) or better in local area networks under ideal conditions. -==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==- Randall Schulz -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
