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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