Educause Security Discussion
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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
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
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.
On 10/09/2013 04:03 PM, Youngquist, Jason R. wrote:
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.
Jason Youngquist, CISSP, CISA
Information Security Engineer
Columbia College - Technology Services
1001 Rogers Street, Columbia, MO 65216
jryoungquist () ccis edu