I want to block users from getting to the internet with the exception of a
handful of websites. 
I'm using:
ACCEPT  loc    net:www.weather.com      tcp 80

This works fine for some sites, but with sites like the weather channel, I
only get partial content. I've looked at the source code and found that they
use a lot of sub domains like images.weather.com. Other sections, even pull
from domains other than their own or specific ip addresses (that seem to
rotate).

I've currently got a section of rules allowing about 15 different ip
addresses out, but the addresses are changing every few days.

What is the best way around this? (Other than constantly monitoring the
shorewall log and adding ip addresses to the rules)


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