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Re: capturing full URL information via DNS request logs
From: Harry Hoffman <hhoffman () IP-SOLUTIONS NET>
Date: Wed, 9 Oct 2013 16:10:04 -0400

Hi Jason,

If you are just capturing DNS queries then you will have only hostnames
not the URL information (URL == protocol + host + location).

DNS requests will show the hostname from either a typed in URL or a
clicked upon URL so you'd get a virtual host and any subsequent
information like if it's a CNAME and the other hostnames associated with
that request.

These might not all come back in the same request and there might be
multiple DNS requests.

If you want full URL then you need to capture more then dns.

If it's http then you can grab the url from the request. If it's https
then your stuck only knowing the host information.

Hope this helps.

Cheers,
Harry




On 10/09/2013 04:03 PM, Youngquist, Jason R. wrote:
Hi All,

Currently we have a network monitoring device using netflow.  One problem we are having with this device is it 
doesn't give us URL information.  There are a few other methods that were recommended to us in order to get this 
information.  Instead of getting an IP address that points to Akamai (ie. this is want is captured via netflow), one 
person suggested that it was relatively easy to capture the original content that the user was downloading.  Ie. in 
the original DNS request the URL information would be included in the packet info.  Are people using DNS logs to 
capture this type of URL traffic?  If so, does it provide the full URL, or just the DNS host name?  DNS host name 
would be useful, but full URL would be even better.

Appreciate any insights you may have.

Thanks.
Jason Youngquist, CISSP, CISA
Information Security Engineer 
Columbia College - Technology Services
1001 Rogers Street, Columbia, MO  65216
(573) 875-7334
jryoungquist () ccis edu
http://www.ccis.edu



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