RealPlayer and RH6.1 revisited

Derek Atkins warlord at MIT.EDU
Wed Feb 16 16:47:42 EST 2000

Do you allow SecureHTTP (HTTP+SSL, usually port 433) through your
firewall?  If so, you wont be able to inspect it.  Do you do stateful
inspections of all your emails?  All your Usenet posts?  Do you
monitor all your telnet sessions character by character?


Ron Peterson <rpeterson at> writes:

> Derek Atkins wrote:
> > 
> > If you allow any real-time protocol through your firewall, someone can
> > tunnel through it.  It's a fact of life.  If you allow telnet, ssh,
> > http, even nntp or smtp, it can be used to tunnel another protocol.
> > If you want to disable tunneling, unplug yourself from the 'net.  If
> > that isn't an option, then you're going to have to use social means to
> > prevent people from doing it.
> Or stateful inspection tools.  Which is what I was asking about.

       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL:      PP-ASEL      N1NWH
       warlord at MIT.EDU                        PGP key available
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