Bill Sommerfeld writes:
> 
> Take a look at pkgsrc/www/adzap.  When used in conjunction with a
> squid proxy (pkgsrc/www/squid), it seems quite effective in filtering
> them out..  Squid can also be set up to filter out cookies and similar
> browser junk food.

Also, FWIW, it is _very_ easy to install Squid (with adzap) in transparent
mode, so you don't have to reconfigure any browsers, etc.  You just add
a couple of ipnat rules to redirect traffic to squid on your BSD router
box.

I use a NetBSD/i386 machine as the router for my wired and wireless
subnets, plus a ~56k dialup link.  Combining ipnat + squid I can surf
from any machine (wired or wireless) and have the benefits of caching
and ad blocking.  Typically for a single user the browser's cache is
sufficient and squid is overkill, but when the single user moves between
machines, browsers, etc squid becomes very attractive.

The specifics on configuring squid for transparent mode are covered in
the squid FAQ. (http://www.squid-cache.org/)  I believe a sample ipnat
script is shown also.

If anyone has trouble, let me know.

-Andrew