DNS cache issue

Adam Tkac atkac at redhat.com
Fri Nov 23 08:27:07 UTC 2007

On Thu, Nov 22, 2007 at 12:46:18PM -0500, Paul Wouters wrote:
> On Thu, 22 Nov 2007, Adam Tkac wrote:
> > > atkac at redhat.com:
> > > > Of course, EDNS is enabled by default
> > >
> > > I see a contradiction here. If it's enabled by default in the Red Hat
> > > version, there shouldn't have to be a "MUST add" to enable it.
> > >
> > > So, which way is it? :-)
> >
> > If you don't specify edns option at all you have EDNS enabled. If you
> > specify "edns yes;" you have same behavior but your named.conf is
> > longer :)
> I ran into issues where named told me "too many EDNS failures, disabling".
> Then I started looking around and found the edns option. I set it to
> yes, and the errors disappeared.

It's mystery that you have different behavior with 'edns yes;' and
without edns option.

> I guess it might have been something else, if edns is enabled by default?
> Also, I am still curious why you turned this into an option. Is there
> any experience you had where you needed to disable edns?

Yes. I had some reports in our bugzilla that syslog is flooded with
messages about disabling EDNS. I believe that problem is in broken
routers. But for many people is far more easy disable EDNS than report
problem to their router vendor. Global ends option is for that people.


> Paul

Adam Tkac, Red Hat, Inc.

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