[asterisk-users] Using dproxy to solve "no DNS hangs everything"problem?

[C F]

Thanks Brian for your work, I have had the same problem I installed
dnsmasq and I *think* the problem is gone now, I'm repeating I think,
I'll only know when the internet goes down again.



On 7/18/06, Brian Capouch <brianc at palaver.net> wrote:
> James Harper wrote:
> >
> >
> > This is a problem that affects more than just asterisk, so I'm sure
> > there are solutions out there!
> >
> > One thing you might do is to put a trailing '.' on all fully qualified
> > DNS names. Without the '.', the system will first try appending the
> > default domain(s), which will cause extra lookups and delays. If all the
> > names that you care about can be resolved locally without needing the
> > internet then the trailing '.' should make it work much faster.
> >
> > Of course, I'm assuming that you do have a local DNS of some sort, and
> > the delays you are seeing are caused by your systems thinking they want
> > to look up external names.
> >
>
> Well after three hours of playing, and knowing it's rank awful to
> respond to your own posts, I would like to review what I've learned and
> maybe save someone else a few million headaches.
>
> I installed dproxy, which is a caching nameserver, and thought at first
> my problems were all solved.  I could lookup names just fine on the
> machine, I saw the names show up in the dproxy cache file (including the
> names of the IAX and SIP servers I register with).  I made a test call
> through one of my ITSPs and it worked just fine.
>
> Then the sky fell: a PSTN call came in, and as the server rang the
> phones in the house (one of which is a SIP phone) things locked up
> tight, just like there wasn't any DNS!!
>
> I did a little boinking around on the CLI, and noticed that all my IAX
> registrations had gone just fine, BUT NOT ONE OF THE SIP REGISTRATIONS
> succeeded.
>
> I'll cut to the quick, although I have to disclaim this as "the best
> guess I have:" it turns out that if the DNS server the Asterisk box is
> pointing to doesn't do SRV lookups, and "srvlookup=yes" in sip.conf,
> it's Goodbye Joe.
>
> I set that option to "no" and restarted.  Now everything appears to be
> working just fine.
>
> Whew.
>
> B.
>
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