[ale] RTSP

[jjj863 at gmail.com (Jerry Yu)]

pretty interesting read. Skype's server actually helps cheating stateful
firewalls on both ends.
I guess more restrictive firewall can stop it though. At smaller places (or
on more manageable networks), a deny-by-default policy could be applied to
outbound traffic as well, thus to stop the disallowed UDP traffic from going
anywhere.

On 1/18/07, Jim Popovitch <jimpop at yahoo.com> wrote:
>
> On Thu, 2007-01-18 at 21:39 -0500, Terry Bailey wrote:
> > Hi,
> >
> > This may be the wrong place to ask this question and I hope that I do
> not
> > get called on the carpet; but, I figure it is the best place to get an
> > answer.  I have been looking at a live wmv stream on Windows Media
> > Player.  The advanced statistics says that the protocol is RTSP(TCP).  I
> > assume that this means RTSP over TCP.  Wouldn't it be more efficient to
> run
> > RTSP over UDP?
>
> Yes.  However, UDP through firewalls can cause some hiccups, so TCP is
> more assured.
>
> While not related to RSTP, here's a good article about how Skype busts
> through layers of firewalls while still using UDP.
> http://www.heise-security.co.uk/articles/82481
>
> -Jim P.
>
>
>
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