switching query-source address on timeout and exhaustion of available servers

Mark Andrews Mark_Andrews at isc.org
Mon Nov 12 21:59:48 UTC 2007


> Hello, on one server I run BIND 9.3.1 as /sbin/named -4 on MacOSX10.3.9.
> 
> In the last few days I have seen failures in resolving some domains,  
> just a couple I believe. This failure happens only when the query- 
> source is changed from one line (ADSL) to another (HDSL) on a  
> different provider.
> I have traced the problem to a routing problem between the HDSL  
> provider network and the secondaries of the domain(s) in question.
> This is what happens: the first name server queried gives a SERVFAIL  
> (should not!) and then the secondaries are interrogated, but they are  
> reachable only from the ADSL line. So when originated from the HDSL  
> line instead, the query times out.
> 
> I hope this is not a FAQ: it would be interesting to be able to switch  
> query-source after a timeout or error has been hit on all nameservers  
> so that the these temporary (hopefully) network problems can be  
> circumvented (at least for DNS...).
> 
> Thanks
> 
> Giuliano
> 
> 
	BIND 9.4 and server
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org



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