Re: GK for Behind-of-Linksys Router Endpoints

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I think you did not undestand me. Can you use ANY H.323 endpoint,
like ohphone, openphone, Cisco ATA, and it will work behind NAT?
They can provide H.323-compiliant endpoints with some propriertary
extensions - but the extensions are not H.323 compiliant and are not
standard.

How does this relate to GnuGk?

----- Original Message ----- From: "Abano, Fernando" <fabano@xxxxxxxxxxxxxx>
Sent: Tuesday, November 09, 2004 6:00 PM



The endpoints are not proprietary. They are H.323-compliant endpoints.

Yes, I think it might have some extensions to allow for NAT traversal as it
can even do double NAT traversal (the Linksys router can be deployed either
as an internet gateway, or it can be part of an internal network that is
connected to another internet gateway.


-----Original Message-----
From: openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of
Zygmuntowicz Michal
Sent: Wednesday, November 10, 2004 12:50 AM
To: openh323gk-users@xxxxxxxxxxxxxxxxxxxxx
Subject: Re:  GK for Behind-of-Linksys Router Endpoints

As you write: "proprietary" which means not truly H.323 compiliant.
It surely has some extensions to allow NAT traversal. NAT traversal
is trivial, if you don't follow standards.

Can you use any H.323 endpoint with this gatekeeper and it works
behind NAT? Or can you use those proprietary endpoints behind NAT
with any H.323 gatekeeper? The answer is no...

----- Original Message ----- From: "Abano, Fernando" <fabano@xxxxxxxxxxxxxx>
Sent: Tuesday, November 09, 2004 5:29 PM



What I have seen was this "proprietary" GK and all that was needed by the
endpoints was broadband connection. The EPs can be public or private. And
it
allows multiple EPs behind a single Linksys router.

-----Original Message-----
From: openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of
Zygmuntowicz Michal
Sent: Wednesday, November 10, 2004 12:23 AM
To: openh323gk-users@xxxxxxxxxxxxxxxxxxxxx
Subject: Re:  GK for Behind-of-Linksys Router Endpoints

One side note: You don't have to forward any ports
if you have a child GnuGk gatekeeper behind NAT
and its parent is also GnuGk. The child must be running
in a proxy mode, the parent should have at least ProxyForNAT=1
set.

----- Original Message ----- From: "Stewart Nelson" <sn@xxxxxxxxxxx>
Sent: Tuesday, November 09, 2004 5:08 PM



Hi Fernando,

I have noticed that if I have an endpoint connected to a Linksys router,
or
some other dumb router, I need to DMZ the EP.

Not quite true, you just need to forward the required ports.

What happens then if I have multiple endpoints behind a single dumb
router?

If the endpoints can use different signaling and media ports, no problem.
For example, the ATA-186 looks like two independent endpoints and works
fine.
However, this is an administrative hassle if you have many endpoints on
different private addresses.


Not sure how other developers did it, but I saw a product that allows
multiple endpoints behind the dumb router, without any "special" config
changes on the router, register to an outside GK, receive inbound calls
from
the PSTN, and make outbound calls to the PSTN.

Is this possible with GNUGK?

You can run gnugk behind the NAT and have many local endpoints register to it. However, you still need the NAT to forward required ports to gnugk.

I can't see how the product you describe could work with a "generic"
outside GK; I'd appreciate a link to the documentation.  Also, I suspect
that the outside GK would have to proxy everything, which is a
performance problem in many cases.

While it is often useful to put an endpoint behind a NAT over which
you have no control, e.g. in a hotel, it is hard for me to imagine a
situation where you install multiple endpoints, yet are not granted
the right to have some ports forwarded.  Could you please give some
more details about your application?

If you are just trying to provide PSTN access to multiple users at
a site, similar to Vonage, Packet8, Broadvoice, etc., IMHO you should
use SIP, just like those providers do.

--Stewart



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