Firewall Wizards mailing list archives

RE: Blocking IM via DNS


From: "Kenneth Porter" <shiva () well com>
Date: Wed, 31 Oct 2001 01:58:30 -0800

On Tue, 30 Oct 2001 11:51:39 -0500, robert_david_graham wrote:

You may also find this this can save bandwidth and increase privacy. For
example, add an entry for "*.doubleclick.net" that points somewhere else.
This will prevent user's machines from downloading advertisement graphics as
well as prevent tracking of user's activities by DoubleClick through
webbugs. (Yes, you can use "*" as a DNS name in BIND and Microsoft DNS
servers). I have about 30 such entries on my personal DNS server to block
advertisements.

The problem here is that some content sites only supply content *after*
they've received confirmation from the ad site that you've downloaded
the ad. One site I read shows nothing but empty frames unless I allow
the ad URL's through.

Ken
mailto:shiva () well com
http://www.sewingwitch.com/ken/
[If answering a mailing list posting, please don't cc me your reply. I'll take my answer on the list.]


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