Hi,
On Sat, 5 Aug 2000, Ahmed Matar wrote:
> I am in urgent need of the port numbers that are usually open on most
> firewalls so that applications can transmit information to users on those
> ports who are behind firewalls. As far as I know (correct me if I am wrong),
> but most firewalls (e.g. Microsoft Proxy 2.0) have special ports open for
> some well-known applications such as the RealPlayer and also have a number
> of ports open for all other applications to use. I've been trying to find
> these ports numbers on the net, but have not suceeded in doing so. Please if
> anybody has this information please send it to me. The reason I'm asking
> this question is because I am creating a application that plays streamed
> audio transmitted to it from another application running on a remote
> webserver. I want users behind firewalls to be able to use my application so
> I need to know on what ports I can transmit my audio to the user (via UDP)
> so that if he/she is behind a firewall, the audio will be received.
well you are very much out of luck here.
There is no such thing as ports open on all firewalls. Any firewall with
ports open for unspecific traffic is junk.
Firewalls that allow streaming audio or ftp data connections to inside users
open the ports required on demand by intercepting communications on usually
a separate control connection where the stream or ftp data connection is
requested.
There's no one solution for every situtaion. Firewall software that does
this usually has special code for ftp, real audio etc.
Greetings
Christian
--
TopLink Internet Services GmbH [EMAIL PROTECTED]
Christian Kratzer http://www.toplink.net/
Phone: +49 7032 2701-0
Fax: +49 7032 2701-19 FreeBSD spoken here!
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