TTL in DNS cache-only

Barry Margolin barmar at
Sat Oct 28 04:12:52 UTC 2006

In article <ehtlhb$25pj$1 at>,
 "afaf el maayati" <eafaf at> wrote:

> Hello;
>   I have a question about the time during a DNS Server (DNS cache-only) can 
> keep information in its memory,  This duration corresponds to the TTL as 
> mentioned in the authoritative DNS server, or the DNS server has its own 
> duration?

The TTL returned by the authoritative server is the maximum time the 
record may be cached.  Of course, servers may discard information sooner 
than this; for instance, if a BIND server is restarted it discards 
everything in the cache, even though it hasn't reached the TTL.

Barry Margolin, barmar at
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

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