barmar at alum.mit.edu
Thu Oct 21 13:05:23 UTC 2004
In article <cl7va0$2p3b$1 at sf1.isc.org>, Pavel Urban <urbanp at mlp.cz>
> 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?
Caching nameservers just use the TTL of the record. When it runs out,
it discards the cached data and queries an authoritative server. The
serial number is not supposed to be used.
> 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?
If he forgot to increase the serial number, his change wouldn't have
transferred to his slave. If your caching server queries the slave when
the TTL runs out, it will get the old data.
Barry Margolin, barmar at alum.mit.edu
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