RE: [Zebedee-talk] Re: Reverse Tunneling with ZBD

[William H. <wha...@po...>]

That shouldn't be necessary, unless the video conferencing software's =
port
selections are hard-coded.  If you can persuade the software either that =
it
should listen on a different port, or that it should send to a different
port on the "remote" host, you can use different local ports for the
tunnels.  I believe you'll need to adjust port mappings at both ends.

Say you have the video conference software set to send on port X and to
receive on port Y:

[local port X] ---> [local-to-remote Zebedee tunnel] ---> [remote port =
Y]
[local port Y] <--- [remote-to-local Zebedee tunnel] <--- [remote port =
X]

From the perspective of the Zebedee client on each end (regardless of
listenmode setting), the tunnel spec is:

tunnel X:*:Y

From the perspective of the Zebedee server on each end (regardless of
clienthost option), the target spec is:

Target localhost:Y

The serverhost and clienthost options used by the initiator of the
connections would be identical and should both specify the the waiting =
party
in the connection.  If you want to insure the connection can only be
initiated from a particular host or from one of a particular set of =
hosts,
the waiting host should either hard-code the serverhost to match the
intended initiator ("single partner" setup), or use Identity Checking to
confirm that the actual initiator is an authorized partner.

- w.h.

-----Original Message-----
From: zeb...@li...
[mailto:zeb...@li...] On Behalf Of Matthis
Sent: Friday, January 23, 2004 11:43 AM
To: zeb...@li...
Subject: [Zebedee-talk] Re: Reverse Tunneling with ZBD


Just a message to say that I have figured out to do some kind of=20
reverse forwarding with ZBD using the -c and -l options, but because my=20
objective is video conferencing, my problem is that I need to do both=20
at the same time. Now, if I try to run both a client and server on the=20
same machine, I get an error saying that the port is already in use=20
(and I only have one port available.) Does anyone now how to forward=20
both ways at the same time through one single tunnel?

Matthis

On 21 Jan 2004, at 19:16, Matthis wrote:

> Hello, being behind a very restrictive firewall, (only port 80 is=20
> open), I thought ssh port forwarding would be exactly what I needed,=20
> but as my final goal was to do video/chat conference, UDP ports were=20
> necessary, so I decided to switch to zebedee.
> Now, although I have successfully been able to send the audio and=20
> video through the firewall to the host running zebedee server; I have=20
> no clue how I can get the other person's audio/video back through the=20
> firewall to me.... (with ssh I would have used "reverse" forwarding,=20
> but I haven't grasped how this works with zebedee, if it is indeed=20
> possible.)
>
> All of this is happening between two mac os X systems, and the=20
> conference uses ohphoneX.
>
> Could anyone help me on how to get zebedee to work tunnel connections=20
> both ways? If that's not possible, does anyone know of a way to=20
> combine it with ssh so that in the end I would be able to forward udp=20
> ports both ways?
>
> Thank you for any help,
>
> Matt
>



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