disable forwardig for specific zones

Hajo Locke Hajo.Locke at gmx.de
Wed Mar 30 14:39:05 UTC 2016


Am 30.03.2016 um 15:06 schrieb W.C.A. Wijngaards via Unbound-users:
> Hash: SHA256
> Hi Hajo,
> On 30/03/16 14:59, Hajo Locke via Unbound-users wrote:
>> Hello,
>> thanks for your help.
>> Am 30.03.2016 um 14:02 schrieb W.C.A. Wijngaards via
>> Unbound-users: Hi Hajo,
>> On 30/03/16 13:25, Hajo Locke via Unbound-users wrote:
>>>>> Hello List,
>>>>> i use unbound 1.4.22 as forwarder to my global dns-cache:
>>>>> forward-zone: name: "." forward-addr: ip.ip.ip.ip
>>>>> now i want to exclude some zones from forwarding and do
>>>>> nameresolution on same machine. i do not find an option to
>>>>> disable forwarding. Is there a possibility for me?
>> Unbound uses the closest match for what forward and stub clause to
>> use.  So you can config more specific forward and stub clauses for
>> the zones and send their queries elsewhere.
>> With stub-zone you can make unbound ask authority servers.
>> # For example; stub-zone: name: "nlnetlabs.nl" stub-host:
>> ns-ext1.sidn.nl. stub-host: sec2.authdns.ripe.net. stub-host:
>> anyns.pch.net. stub-addr:   # for ns.nlnetlabs.nl
>> stub-addr: 2a04:b900::8:0:0:60  # for ns.nlnetlabs.nl
>>> so a wildcardforwarding is only overwriteable by specific
>>> forwarding? a possibility to stop forwarding for some zones and
>>> do lookup on localhost would be nice.
> Yes.  Do you mean specific, with specific authority servers for a
> zone?  Or do you mean that a name: "nl" stub-zone and forward-zone
> would catch all zones ending in '.nl' (this is the way unbound works
> now, all queries ending in that name are forwarded)?
yes, i mean a specific name.
currently i have the wildcardforward. i just want to exclude some 
domainnames from this forwarding and use unbound as local resolver for 
this domains.
to clarify i use the imaginary directive "exclude" as example to show.

         name: "."
         exclude: "example.com"
         forward-addr: ip.ip.ip.ip

As reverse solution i could only forwarding zones which i already know, 
which is not possible/useful, when running as dns-cache.

I could achive the same on indirect way by using a further forward to 
another unbound on localhost on different port, wich is not configured 
as forwarder.

         name: "example.com"
         forward-addr: at 54
         forward-first: yes

But this seems to be not that easy to realise as i thought.  It seems by 
default unbound is not ready to start in multiple instances on different 
ports with different settings. I could not create multipe servers. I 
think the only way is to start a 2nd unbound deamon with complete 
different startscript, pids, confs etc.
hmm, to big effort for my puposes.
> But you can definitely forward some zones and do a lookup on localhost
> by entering more specific overrides.
> forward-zone:
> 	name: "example.com"
> 	stub-addr: at 54
> And then add entries for all the zones for which you want to query the
> other unbound on port 54.  (set do-not-query-localhost: no to allow
> queries to go to
> Best regards, Wouter
>> (For the nameservers in the zone itself I used IP addresses, to
>> avoid a circular dependency).
>> stub-prime: yes will make it fetch the NS set using this list of
>> servers and use that NS set for further queries.  Note that it
>> will use your global forwarder to lookup sec2.authdns.ripe.net.  If
>> you do not desire such lookups to the global forwarder, give IP
>> addresses.
>> Best regards, Wouter
>>>>> As fallback i could forward to and create a new,
>>>>> not forwarding unbound on port 54.
>>>>> Thanks, Hajo
>> Thanks, Hajo
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