Bind sometimes SERVFAIL

[Jukka Pakkanen]

> Hello,
> 
>     My Internet ISP give two nameservers address.
> But when I'm asking those two servers sometimes I get:
> [root at 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)

I just saw the same thing:

metis% host d.timg.com
Host d.timg.com not found: 3(NXDOMAIN)
metis% !!
host d.timg.com
Host d.timg.com not found: 3(NXDOMAIN)
metis% host d.yimg.com 
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 98.137.88.88
metis% named -v
BIND 9.6.1-P1

Above executed in the space of about a minute...
---------------------------

timg <> yimg




> 
> but sometimes I get:
> 
> [root at 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.
> 
> 
> 
> _______________________________________________
> bind-users mailing list
> bind-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/bind-users

---------------------------------------------------------------------
Gregory Hicks                           | Principal Systems Engineer
                                        | Direct:   408.569.7928

People sleep peaceably in their beds at night only because rough men
stand ready to do violence on their behalf -- George Orwell

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"The best we can hope for concerning the people at large is that they
be properly armed." --Alexander Hamilton

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