TTL Question

Mike Diggins diggins at McMaster.CA
Tue Oct 16 23:06:37 UTC 2007

On Wed, 17 Oct 2007, Mark Andrews wrote:

>> What dictates how long another name server caches the authoritative name
>> server for a domain? I was under the impression it was the default
>> time-to-live, but I have a situation where an authoritative name server
>> was removed from service several days ago, yet queries to it continue. Dig
>> is correctly reporting the new authoritative name servers for the domain
>> in question. How common is it for DNS servers to ignore the ttl?
> 	Because you failed to update *ALL* the servers for the zone to
> 	have the new content.  Every time a cache queries the old servers
> 	it re-learns the old NS RRset for the zone.
> 	Mark

Do you know something I don't? Our registrar (Canhost) was contacted to 
have the DNS server removed. When I check, that appears to have 
been done (it correctly lists our nameservers). Did I miss a step?


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