On Mon, 01 Sep 2003 11:42:15 +0000 Shane Hollis <[EMAIL PROTECTED]> wrote:
> The DNs is a semi heiracrchical system from my understanding. The master DNS ( > to use a phrase loosely) are based in the states. My provider in the states > is on the main backbone. Therefore changes get sent out much more rapidly and > from a centrally located place, not from a little backwater like NZ. not all of the root servers are in the US, http://www.root-servers.org/ > > If I change a DNS here in NZ, it is like injecting an agent into tip of a > whales tail. It takes along time to propogate through the system. If I inject > into the heart it is sent out a lot more quickly and spreads like a ripple > from the centre of the pond, not from the edge. (some very mixed similes > here). it depends on your time to live (ttl). when a dns server looks up a name it looks from the ass end backwards. ie for www.clug.geek.nz it forst looks for an authoritative server for .nz, then for .geek.nz then for .clug.geek.nz then for www.clug.geek.nz Along the way it might have www.clug.geek.nz cached, but its only allowed to be cached for the ttl period. Stable dns systems can have long ttl's. dyndns uses (IIRC) 60 seconds. ie if your dyndns record changes, it will be wrong in many caches round the internet for up to 60 seconds. all dns queries take time, and a lot more time if its not in the cache. therefore change propogation depends on TTL rather than anything else. A non-cached query time depends on how many levels you have to go through to get to the authoritative server for your query. > > I amy be wrong.... > Shane > > > On Sun, 31 Aug 2003 02:13, you wrote: > > On Sun, Aug 31, 2003 at 12:07:46AM +0000, Shane Hollis wrote: > > > I use a redirector for my domain. It is based in the states, closer to > > > the central DNS servers so changes get sent out pretty quickly. > > > > Excuse me? how do you come to that conclusion? > > > > Mike. > > -- > Shane Hollis > Notes Unlimited New Zealand > Ph: 021 465 547 > Email: [EMAIL PROTECTED] > -- Nick Rout Barrister & Solicitor Christchurch, NZ Ph +64 3 3798966 Fax + 64 3 3798853 http://www.rout.co.nz [EMAIL PROTECTED]
