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Expert
infinidim
Posts: 458
Registered: ‎09-03-2010
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Accepted Solution

DNS server returns IP addresses even for domain names which should not resolve.

Like a number of other people I have been looking at the BT Broadband service and have found that there is an issue with the current DNS server. What I / we have found is that the DNS server returns IP addresses even for domain names which should not resolve. See following -

 

DNS results wildcarding (?): Warning

 

Your ISP's DNS server returns IP addresses even for domain names which should not resolve. Instead of an error, the DNS server returns an address of 92.242.132.15, which resolves to unallocated.barefruit.co.uk.

 

There are several possible explanations for this behavior. The most likely cause is that the ISP is attempting to profit from customer's typos by presenting advertisements in response to bad requests, but it could also be due to an error or misconfiguration in the DNS server.

 

The big problem with this behavior is that it can potentially break any network application which relies on DNS properly returning an error when a name does not exist.

 

The following lists your DNS server's behavior in more detail.

  • www.{random}.com is mapped to 92.242.132.15.
  • www.{random}.org is mapped to 92.242.132.15.
  • fubar.{random}.com is mapped to 92.242.132.15.
  • www.yahoo.cmo [sic] is mapped to 92.242.132.15.
  • nxdomain.{random}.netalyzr.icsi.berkeley.edu is mapped to 92.242.132.15.

Moderators could you please investigate this for us.

Infinidim
Megadodo Publications
Ursa Minor Beta

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Distinguished Guru
Ectophile
Posts: 4,038
Registered: ‎27-01-2010
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Re: DNS server returns IP addresses even for domain names which should not resolve.

They have been doing this for months.

 

If you type a random address into your web browser, you will probably find that you get a web page, rather than just an error message.  That page will have an opt-out link on it.  Once opted out, the change should be permanent.

Aspiring Contributor
RedAmberGreen
Posts: 7
Registered: ‎01-04-2011
0

Re: DNS server returns IP addresses even for domain names which should not resolve.

[ Edited ]

BT use a Barefruit (which your post seems to suggest) service called 'Error Resolution'.

 

http://www.barefruit.com/background/error_resolution.php

 

Any DNS that can not get resolved goes via this service and returns a page showing paid adverts and/or links related to what they think you were looking for.

 

BT refer to this as 'BT Web Address Help' and can be turned off on an opt-out basis via this link: http://preferences.webaddresshelp.bt.com/selfcare/

 

I assume BT's view is this helps improve the user experience and provides some directed help instead of a blank error page.

 

Further details: http://www.bt.com/help/webaddresshelp

Expert
infinidim
Posts: 458
Registered: ‎09-03-2010
0

Re: DNS server returns IP addresses even for domain names which should not resolve.

[ Edited ]

RedAmberGreen wrote:

BT use a Barefruit (which your post seems to suggest) service called 'Error Resolution'.

 

http://www.barefruit.com/background/error_resolution.php

 

Any DNS that can not get resolved goes via this service and returns a page showing paid adverts and/or links related to what they think you were looking for.

 

BT refer to this as 'BT Web Address Help' and can be turned off on an opt-out basis via this link: http://preferences.webaddresshelp.bt.com/selfcare/

 

I assume BT's view is this helps improve the user experience and provides some directed help instead of a blank error page.

 

Further details: http://www.bt.com/help/webaddresshelp


Thanks for this RedAmberGreen.

Infinidim
Megadodo Publications
Ursa Minor Beta

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Contributor
TankSlappa
Posts: 42
Registered: ‎26-05-2011
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Re: DNS server returns IP addresses even for domain names which should not resolve.

I too would like the DNS to return unresolved domains correctly, and not hi-jack typos.

 

I followed the link and ended up at http://preferences.webaddresshelp.bt.com/selfcare/preferences.cgi

 

With a message of:

 

BT Web Address Help - Preferences

Sorry. Unfortunately we have encountered an error and have been unable to check your Web Address Help preferences.

 

Is this just a temporary error, or have BT moved the preferences page and made all the old links invalid?