> How can general firewall make Content Filter? Did they open the
> packet and read the content byte by byte? For example url filter,
> Could the firewall understand the meaning of the url?
It could be done that way, but I think that would make the firewall rather
complicated.
An alternative approach would be to set up a web proxy server within the
protected network, set up content filtering on it (which I'm told is not
difficult with some proxy server software) and set up the firewall so only
the proxy server is allowed to make Web connections outside the protected
network. (Of course, this requires every web browser on the network to be
reconfigured.)
Regards,
Ross
It's really quite easy. The first column of letters is like Greek, the
second like English, and the third like a steam train.
-- Me, on the Russian alphabet
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