> Can someone tell me exactly what a Proxy can do
> that a good packet filtering firewall cannot do?
> _Pete Morrissey
> _Syracuse University
As an example - my mail proxy parses the mail from/to lines and the
envelope header looking for known 'sendmail' bug chars, and other
illegal/unwanted characters. (Not that I actually run sendmail - ugh!).
This would be difficult (impossible?) with a packet filter. The
difference is that a proxy looks at the data in the stream, whereas a
filter only looks at source and dest. (Ignoring hybrid mixtures