shorten cache ttl?
phn at icke-reklam.ipsec.nu
phn at icke-reklam.ipsec.nu
Thu Jul 1 10:34:07 UTC 2004
Marten Lehmann <lehmann at cnm.de> wrote:
> Hello,
> I'm running two caching nameservers, one with djbdns (dnscache), one
> with BIND. I noticed two difference from djbdns to BIND:
> 1. A record does not exist for a certain domain/subdomain in the
> authoritative nameserver when caching dns is used to resolve first, but
> does exist before resolving the second time
> Behaviour with djbdns: Entry doesn't exist the first time, but entry
> does exist the second time
> Behaviour with BIND: Entry doesn't exist the first time and doesn't
> exist the second time.
> Bind seems to remember the "I didn't find such a record at the
> authoritative dns" for some time and does not ask the authoritative
> nameserver again the second time, while djbdns does. I guess BIND uses
> sort of TTL, but whats the TTL of a non existing record? But even
> existing entries are cached to long (but maybe according to the TTL of
> the authoritative nameserver). Can I overwrite the TTL of the
> authoritative nameservers at my caching nameserver, so that the records
> expire earlier?
Bind obeys RFC2308 ( Negative Caching of DNS Queries (DNS NCACHE) djdns
ignores it.
> Regards
> Marten
--
Peter Håkanson
IPSec Sverige ( At Gothenburg Riverside )
Sorry about my e-mail address, but i'm trying to keep spam out,
remove "icke-reklam" if you feel for mailing me. Thanx.
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