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Using OpenDNS

 

 

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subscriptions.private at mgn

Feb 2, 2010, 11:33 AM

Post #1 of 6 (1322 views)
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Using OpenDNS

Careful when using OpenDNS. Examples:

smtp5:/# host -t mx sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
sdsdsdsdsdsdsdsdsgmail.com does not exist at resolver2.opendns.com, try again

smtp5:/# host -t a sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
sdsdsdsdsdsdsdsdsgmail.com A 67.215.65.132
!!! sdsdsdsdsdsdsdsdsgmail.com A record has zero ttl

smtp5:/# host -t a sdsdsdsdsdsdsdsdsgmail.com
sdsdsdsdsdsdsdsdsgmail.com does not exist (Authoritative answer)

If you're checking for an A-record you'll always get an answer with OpenDNS.

--

Regards,

Martin Nicholas.

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exim-users at lists

Feb 2, 2010, 11:58 AM

Post #2 of 6 (1238 views)
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Re: Using OpenDNS [In reply to]

On 02/02/2010 19:33, Martin Nicholas wrote:
> Careful when using OpenDNS. Examples:
>
> smtp5:/# host -t mx sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
> sdsdsdsdsdsdsdsdsgmail.com does not exist at resolver2.opendns.com, try again
>
> smtp5:/# host -t a sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
> sdsdsdsdsdsdsdsdsgmail.com A 67.215.65.132
> !!! sdsdsdsdsdsdsdsdsgmail.com A record has zero ttl
>
> smtp5:/# host -t a sdsdsdsdsdsdsdsdsgmail.com
> sdsdsdsdsdsdsdsdsgmail.com does not exist (Authoritative answer)
>
> If you're checking for an A-record you'll always get an answer with OpenDNS.

Unless you turn that off.

--
Mike Cardwell : UK based IT Consultant, Perl developer, Linux admin
Cardwell IT Ltd. : UK Company - http://cardwellit.com/ #06920226
Technical Blog : Tech Blog - https://secure.grepular.com/
Spamalyser : Spam Tool - http://spamalyser.com/

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graeme at graemef

Feb 2, 2010, 11:59 AM

Post #3 of 6 (1239 views)
Permalink
Re: Using OpenDNS [In reply to]

On Tue, 2010-02-02 at 19:33 +0000, Martin Nicholas wrote:
<snip>
> If you're checking for an A-record you'll always get an answer with OpenDNS.

Yep. That's their business model - the same one the the SiteFinder
debacle rolled out to, er, the entire Internet a few years ago.

If you choose to use their free service, they deliver content to you
which might match the domain you requested when browsing for things
which have no A record.

If you pay, you get "Ad-free Guide and block pages".

I guess YGWYPF.

Considering it's almost impossibly easy to run a local caching DNS
server, if you want to avoid delegating control over the Internet to a
third party with whom you have no existing business relationship, you
should.

Graeme


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exim-users at lists

Feb 2, 2010, 12:22 PM

Post #4 of 6 (1234 views)
Permalink
Re: Using OpenDNS [In reply to]

On 02/02/2010 19:59, Graeme Fowler wrote:
> On Tue, 2010-02-02 at 19:33 +0000, Martin Nicholas wrote:
> <snip>
>> If you're checking for an A-record you'll always get an answer with OpenDNS.
>
> Yep. That's their business model - the same one the the SiteFinder
> debacle rolled out to, er, the entire Internet a few years ago.
>
> If you choose to use their free service, they deliver content to you
> which might match the domain you requested when browsing for things
> which have no A record.
>
> If you pay, you get "Ad-free Guide and block pages".

crapbook:~ mike$ host -t a sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
Using domain server:
Name: 208.67.220.220
Address: 208.67.220.220#53
Aliases:

sdsdsdsdsdsdsdsdsgmail.com has address 67.215.65.132

Then I logged into my free opendns account and turned everything in the
advanced settings off and waited a few minutes. Now:

crapbook:~ mike$ host -t a sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
Using domain server:
Name: 208.67.220.220
Address: 208.67.220.220#53
Aliases:

Host sdsdsdsdsdsdsdsdsgmail.com not found: 3(NXDOMAIN)
crapbook:~ mike$

--
Mike Cardwell : UK based IT Consultant, Perl developer, Linux admin
Cardwell IT Ltd. : UK Company - http://cardwellit.com/ #06920226
Technical Blog : Tech Blog - https://secure.grepular.com/
Spamalyser : Spam Tool - http://spamalyser.com/

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aawolfe at gmail

Feb 2, 2010, 12:55 PM

Post #5 of 6 (1234 views)
Permalink
Re: Using OpenDNS [In reply to]

On Tue, Feb 2, 2010 at 2:58 PM, Mike Cardwell
<exim-users [at] lists> wrote:
> On 02/02/2010 19:33, Martin Nicholas wrote:
>> Careful when using OpenDNS. Examples:
>>
>> smtp5:/# host -t mx sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
>> sdsdsdsdsdsdsdsdsgmail.com does not exist at resolver2.opendns.com, try again
>>
>> smtp5:/# host -t a sdsdsdsdsdsdsdsdsgmail.com 208.67.220.220
>> sdsdsdsdsdsdsdsdsgmail.com      A       67.215.65.132
>>  !!! sdsdsdsdsdsdsdsdsgmail.com A record has zero ttl
>>
>> smtp5:/# host -t a sdsdsdsdsdsdsdsdsgmail.com
>> sdsdsdsdsdsdsdsdsgmail.com does not exist (Authoritative answer)
>>
>> If you're checking for an A-record you'll always get an answer with OpenDNS.
>
> Unless you turn that off.
>

And until their marketing department turns on another "feature".

Using DNS from a company who's primary business model is to muck about
with DNS is just not a good idea.


> --
> Mike Cardwell    : UK based IT Consultant, Perl developer, Linux admin
> Cardwell IT Ltd. : UK Company - http://cardwellit.com/       #06920226
> Technical Blog   : Tech Blog  - https://secure.grepular.com/
> Spamalyser       : Spam Tool  - http://spamalyser.com/
>
> --
> ## List details at http://lists.exim.org/mailman/listinfo/exim-users
> ## Exim details at http://www.exim.org/
> ## Please use the Wiki with this list - http://wiki.exim.org/
>

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exim-users at lists

Feb 2, 2010, 1:53 PM

Post #6 of 6 (1233 views)
Permalink
Re: Using OpenDNS [In reply to]

* on the Tue, Feb 02, 2010 at 03:55:50PM -0500, Aaron Wolfe wrote:

>>> If you're checking for an A-record you'll always get an answer with OpenDNS.
>>
>> Unless you turn that off.
>
> And until their marketing department turns on another "feature".

Has OpenDns ever done that?

> Using DNS from a company who's primary business model is to muck about
> with DNS is just not a good idea.

For running an MTA yes. Running a home network off OpenDns on the other hand is a very good idea.

--
Mike Cardwell : UK based IT Consultant, Perl developer, Linux admin
Cardwell IT Ltd. : UK Company - http://cardwellit.com/ #06920226
Technical Blog : Tech Blog - https://secure.grepular.com/
Spamalyser : Spam Tool - http://spamalyser.com/

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