caching question

Vinny Abello vinny at
Thu Oct 21 13:06:08 UTC 2004

For caching, BIND goes based on the record's TTL from the authoritative 
server. It's likely the record was still cached due to the TTL. Use dig 
against your caching server to view the remaining TTL on the record. The 
serial number doesn't come into play in this case, only with zone transfers.

At 05:11 AM 10/21/2004, you wrote:
>as far as I know, when secondary nameserver asks primary if his zone is
>up-to-date, it just checks for serial number. What about
>non-authoritative (caching) nameserver?
>I have a customer that argued that our DNS server had wrong data for his
>zone. It turned out that the customer forgot to increase serial number.
>How BIND acts in this case?
>Pavel Urban (pavel.urban at
>IOL system disaster
>Internet OnLine, owned by Cesky Telecom, a.s. (
>     Vegetables should not operate electronic equipment.
>            Computer Stupidities,

Vinny Abello
Network Engineer
Server Management
vinny at
(973)300-9211 x 125
(973)940-6125 (Direct)
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