Question

DNS - how to I configure where unresolved hostnames redirect to?

Asked by: ChrisCranie

Hope someone has an idea on this.
At some point in history the organisation looked at using OpenDNS. We don't use this any more, but for some reason whenever a LAN or WAN hostname is not resolved, it redirects to to an external OpenDNS website.

A) Can I change this setting?
B) Where would I find it?


Regards
Chris

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Asked On
2009-11-06 at 03:26:16ID24877517
Tags

DNS

,

redirect

,

opendns

Topics

Domain Name Service (DNS)

,

Network Management

Participating Experts
1
Points
250
Comments
4

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Answers

 

by: nociPosted on 2009-11-06 at 06:07:19ID: 25759172

A * (for any RR) should match all not otherwise named entities.

Just add a * name the the zone with the right RR (A, CNAME...) dont let it have a too long a TTL (3600 or so is good enough). otherwise you cache might keep names for too long, or you have to wait up to TTL expiration on the name to realy use it....

If you want to keep this as a backup of loggod out systems or so, then you need a shorter TTL...

 

by: ChrisCraniePosted on 2009-11-06 at 06:45:31ID: 25759489

DNS not my area, so need to understand at a higher level what you've suggested noci;

>> A * (for any RR) should match all not otherwise named entities.
I've checked the forward lookup zone for our domain - no A* record is listed.
I'm not sure what you mean by 'RR'

>> Just add a * name the the zone with the right RR (A, CNAME...) dont let it have a too long a TTL (3600
>> or so is good enough). otherwise you cache might keep names for too long, or you have to wait up
>> to TTL expiration on the name to realy use it....
Not sure how this answers my original question. Why are redirects currently going to opendns (67.215.65.132), where can I find this setting?

Chris

 

by: nociPosted on 2009-11-06 at 08:15:02ID: 25760415

Sorry I mis read that part. I thought you wanted to have a generic response to a name...

you need to lookup forwarding settings. IF you cannot resolve a name then you can delegate that to a 'forwarder'.
See zone config if there is a forwarder associated with it.

 

by: ChrisCraniePosted on 2009-11-06 at 08:29:17ID: 31650976

Found it. There were a couple of DNS entries in there, have taken them out and it's now operating as required.

Good work!
Chris.

20120131-EE-VQP-002

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