Re: DNS primer

[Dave Howe <[EMAIL PROTECTED]>]

Philip Rowlands wrote:
> I wish this comment "TTL" would vanish from the default zonefiles of the
> world... The fifth field in SOA is the negative-cache TTL; the time that
> a lookup failure can be remembered and replayed without recourse to an
> authoritative server.
> See RFC2308, and please test against your favourite caching server.
> google.com is a good test-case - ncache TTL is set to 60 seconds.
While 2308 is an excellent idea and addresses issues in the overloading 
of that field to mean three things (one of which has never been 
implimented to my knowledge - the *minimum* TTL) AFAIK it is not yet 
accepted as part of the standard - so DNS servers are still free to 
ignore it if they wish. If this is no longer true let me know - I will 
be delighted to hear it :)