Re: [cobalt-users] DNS Propagation Question

["Michael Zimmermann" <zim@xxxxxxxx>]

Hi Alonso,

you wrote:
> Is there a way to speed-up DNS propagation?
> I changed my DNS settings at Network Solutions and it's taking forever for
> the new settings to propagate. [...],I keep hitting the old site. It's
> been at least ten days since I made the changes at NS.
>
> Any suggestions?

Once I also observed a very long propagation-time of changes.
This was caused by the fact that the primary nameserver was
not given correctly. So when the primary is down, or otherwise
not accessible (e.g. the secondary(s) cannot get AXFR responses),
the propagation seems to need at least the expire-timeout
(which is usually set to one week, but some paper even
advise to set it to two weeks).

As you seem to observe the delay in DNBS-propagation only from
a certain location (your home) in the net, perhaps there is a nameserver
in the upstream, which has an old BIND - incapable of reacting to
change notifications?

If it was important for me to trace this down to it's source,
I would make a modification in my DNS records (just
changing the serial is enough) and then check the nameservers
via 'dig'. And to get the nameservers 'upstream' I would run
a traceroute from home to my server and then lookup the
nameservers of the hop-stations.


Michael