Re: error (network unreachable)

2010-04-24 Thread Mark Andrews

In message , "ic.nssip" writ
es:
> 
> I just enabled querylog (using rndc querylog command) and each first =
> query logged it's coming with errors (network unreachable) when trying =
> to resolve dns servers names.
> 
> Has anyone any idea where from this sort of message is coming from and =
> what should I do to get it fixed?

You should turn on IPv6.  The messages are the result of named
trying to query nameservers using IPv6 but as you don't have a IPv6
route to these servers the OS returns a error message saying that
it couldn't send the message and named moves onto the next server.

Alternatively you can disable the use of IPv6 with "named -4".

Mark
 
> Thank you,
> Julian
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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dig +trace to find all the forwarders?

2010-04-24 Thread Josh Kuo
Hi all,

I am trying to trace a recursive outbound query. My workstation is
configured to point to the forwarder/resolver 192.168.0.2, which is a
dedicated forwarder that is configured to forward all DNS queries to the
ISP's DNS resolver. Sometimes I get name resolution failures, and I want to
know if it is the ISP's DNS resolver is forwarding recursive queries to yet
another server... when using 'dig example.com +trace', it only shows the
recursive lookup starting at the root domain, instead of showing from my
192.168.0.2 -> ISP -> ? -> root name servers.

Is there any way to discover all the forwarders/resolvers along the way
before my query hits one of the root name servers? Or is that an impossible
feat unless I have administrative access to each of the resolvers/forwarders
to look at its configuration?

Thanks in advance.

-Josh
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Re: dig +trace to find all the forwarders?

2010-04-24 Thread Mark Andrews

In message , Jo
sh Kuo writes:
> Hi all,
> 
> I am trying to trace a recursive outbound query. My workstation is
> configured to point to the forwarder/resolver 192.168.0.2, which is a
> dedicated forwarder that is configured to forward all DNS queries to the
> ISP's DNS resolver. Sometimes I get name resolution failures, and I want to
> know if it is the ISP's DNS resolver is forwarding recursive queries to yet
> another server... when using 'dig example.com +trace', it only shows the
> recursive lookup starting at the root domain, instead of showing from my
> 192.168.0.2 -> ISP -> ? -> root name servers.
> 
> Is there any way to discover all the forwarders/resolvers along the way
> before my query hits one of the root name servers? Or is that an impossible
> feat unless I have administrative access to each of the resolvers/forwarders
> to look at its configuration?

You need administrative access to see the overides to the normal resolution
process.

Mark
 
> Thanks in advance.
> 
> -Josh
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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Re: dig +trace to find all the forwarders?

2010-04-24 Thread Josh Kuo
>
> You need administrative access to see the overides to the normal resolution
> process.
>
>
Just so I understand this completely, by administrative access you mean I
need to be able to log in to each of the resolvers (not administrative
access on my local workstation to do a 'sudo dig example.net a +trace'),
correct?

A follow up question to that... is it even possible to perform such a trace
(revealing all resolvers) with the DNS protocol? Or is this purely a
designed limitation of dig?
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Re: dig +trace to find all the forwarders?

2010-04-24 Thread Mark Andrews

In message , Jo
sh Kuo writes:
> > You need administrative access to see the overides to the normal resolution
> > process.
> >
> >
> Just so I understand this completely, by administrative access you mean I
> need to be able to log in to each of the resolvers (not administrative
> access on my local workstation to do a 'sudo dig example.net a +trace'),
> correct?
> 
> A follow up question to that... is it even possible to perform such a trace
> (revealing all resolvers) with the DNS protocol? 

It's impossible.

>Or is this purely a designed limitation of dig?
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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