On Tue, 10 May 2005, Mark Quitoriano wrote:
> well that's my problem with bind. once i cut myself to the internet
> i can't resolve all domain. i did this as a test i ping google.com
> first while i am connected to the net and then i disconnect my cable
> and try to ping it again but it can't resolve google.com anymore, my
> resolve.conf is "nameserver 127.0.0.1", and i don't know how to
> configure bind to cache domain's ip addressess at least 1 day or so.
IMO, it's a feature, not a bug, that bind honors the TTL settings of
remote name servers. Google, for instance, tends to assign unusually
short TTLs to its DNS entries:
$ dig www.google.com +noall +answer
www.google.com. 900 IN CNAME www.l.google.com.
www.l.google.com. 300 IN A 66.102.7.147
www.l.google.com. 300 IN A 66.102.7.99
www.l.google.com. 300 IN A 66.102.7.104
Google is telling remote name servers to cache the 'www.google.com'
entry (which is just a CNAME) for 15 minutes and the actual addresses
of its web servers for only 5 minutes.
That's why bind won't cache it for an entire day.
I suppose that you could hack named so that it ignores remote TTL
requests, but my hunch is that you won't get any sympathy when you
complain that now your name server has begun misbehaving... :-)
--Paul Heinlein <heinlein@xxxxxxxxxx>
