[Blink] DNS lookup failure

[Hendrik Schweppe]

Hi Conrad,

I guess this is the same problem I experienced. In fact, it is a problem
of Blink with your network's firewall configurations (at least for me).

Blink refuses to use the nameservers provided via DHCP but directly
queries your registrar's DNS servers. This fails for a lot of firewalls as they don't
allow direct DNS requests.

I asked for a changed behavior, but the response I got was that many local
routers (i.e. cheap DSL routers) can't handle SRV requests and thus blink
would not go for the configured DNS server, unfortunately.

Hope this helps you to narrow down the problem. Try
"host -t SRV _sip._udp.voip.tierzero.net ns1.tierzero.net" and see if you
get a response or whether it is firewalled.


Best,
Hendrik

PS: See "Re: [Blink] Fwd: sip: dns queries" for the original thread (June 2010).

On Dec 18, 2010, at 7:33 PM, Conrad Heiney wrote:

> Hi:
> 
> When I try to use Blink with the latest release it fails to find the
> SRV record for my provider. Example log:
> 
> 2010-12-18 10:30:57   Account('3107841375a at voip.tierzero.net') failed
> to register: DNS lookup failed: Timeout in lookup for routes for SIP
> URI sip:voip.tierzero.net (retrying in 9.11 seconds)
> 2010-12-18 10:30:57   Error: The account 3107841375a at voip.tierzero.net
> failed to register(DNS lookup failed: Timeout in lookup for routes for
> SIP URI sip:voip.tierzero.net)
> 2010-12-18 10:31:21   Account('3107841375a at voip.tierzero.net') failed
> to register: DNS lookup failed: Timeout in lookup for routes for SIP
> URI sip:voip.tierzero.net (retrying in 18.67 seconds)
> 2010-12-18 10:31:21   Error: The account 3107841375a at voip.tierzero.net
> failed to register(DNS lookup failed: Timeout in lookup for routes for
> SIP URI sip:voip.tierzero.net)
> 
> However, other softphones do not have this problem. Additionally, a
> command line lookup works:
> 
> tertius:~ conradh$ host -t SRV _sip._udp.voip.tierzero.net
> _sip._udp.voip.tierzero.net has SRV record 0 0 5060 proxy01.voip.tierzero.net.
> 
> If I set the proxy manually then Blink connects fine.
> 
> What could be the problem?
> 
> thanks,
> 
> Conrad
> 
> -- 
> Conrad Heiney, Senior System Administrator
> Tierzero, Inc.
> conrad at tierzero.com | 213 784 1375
> _______________________________________________
> Blink mailing list
> Blink at lists.ag-projects.com
> http://lists.ag-projects.com/mailman/listinfo/blink

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