Generally speaking, it's not a good idea to use RFCs to diagnose
operational issues, unless you've already narrowed the problem down to
some sort of standard-conformance or interoperability issue.
What is described below is merely one of potentially *dozens* of
different causes of a SERVFAIL result.
Follow normal root-cause analysis. Eliminate variables/causes.
Understand and test dependencies. Get to the heart of the matter. If you
don't know how to do that personally, escalate to someone who does.
- Kevin
Pawel Rutkowski wrote:
Hello,
My Internet ISP give two nameservers address.
But when I'm asking those two servers sometimes I get:
[r...@linux ~]# host d.yimg.com ns.my.isp
Using domain server:
Name: ns.my.isp
Address: ns.my.isp#53
Aliases:
Host d.yimg.com not found: 2(SERVFAIL)
but sometimes I get:
[r...@linux ~]# host d.yimg.com ns.my.isp
Using domain server:
Name: ns.my.isp
Address: ns.my.isp#53
Aliases:
d.yimg.com is an alias for geoycs-d.gy1.b.yahoodns.net.
geoycs-d.gy1.b.yahoodns.net is an alias for
fo-anyycs-d.ay1.b.yahoodns.net.
fo-anyycs-d.ay1.b.yahoodns.net has address 98.137.80.54
He explain me this thats a normal because of this:
http://www.faqs.org/rfcs/rfc2308.html
Some resolvers incorrectly continue processing if the authoritative
answer flag is not set, looping until the query retry threshold is
exceeded and then returning SERVFAIL. This is a problem when your
nameserver is listed as a FORWARDER for such resolvers. If the
nameserver is used as a FORWARDER by such resolver, the authority
flag will have to be forced on for NXDOMAIN responses to these
resolvers. In practice this causes no problems even if turned on
always, and has been the default behaviour in BIND from 4.9.3
onwards.
Is this true ?
Thanks
Pawel R.
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