Re: Firewall/NAT Crossing by H.323/H.248

26 Mar 2001


      Euchner:
Steve Davies has provided another URL to me. It is working for me. Hope that
it will work for all of you.
Best regards,
Radhika R. Roy
AT&T
+1 732 420 1580
rrroy@att.com
-----Original Message-----
From: Steve Davies [mailto:SDavies@Ridgeway-Sys.com]
Sent: Thursday, March 22, 2001 2:45 PM
To: Roy, Radhika R, ALCOO
Subject: RE: Firewall/NAT Crossing by H.323/H.248
Radhika,
The document is going through the IETF draft process - we sent it on
Tuesday. In the meantime its available from www.vxserver.com/standards.
We will be at the SIP discussion tomorrow. Thanyou - we think it is a better
solution too. The PIA does not need to be application aware (so its future
proof), the PS takes care of that. The PIA can be client software (i.e a
shim to the application) or a standalone unit. It scales down as well as up.
regards
Steve
Steve Davies
Chief Technical Officer
Ridgeway Systems and Software
Email: mailto:sdavies@ridgeway-sys.com
Web:  www.ridgeway-sys.com
Tel  B: +44 (0) 118 938 1114
Tel H: +44  (0) 1285 770979
-----Original Message-----
From: Euchner Martin [mailto:Martin.Euchner@icn.siemens.de]
Sent: Monday, March 26, 2001 9:38 AM
To: Roy, Radhika R, ALCOO; ITU-SG16@mailbag.cps.INTEL.COM
Subject: AW: Firewall/NAT Crossing by H.323/H.248
Radhika,
thanks for pointing to this interesting draft. However, I was unable to
obtain that document;
http://www.ietf.org/internet-drafts/draft-davies-fw-nat-traversal-00.txt
http://www.ietf.org/internet-drafts/draft-davies-fw-nat-traversal-00.txt
is not successful.
Would someone be so kind and send it to me?
Kind Regards
Martin Euchner.
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-----Ursprüngliche Nachricht-----
        Von:    Roy, Radhika R, ALCOO [SMTP:rrroy@ATT.COM]
        Gesendet am:    Donnerstag, 22. März 2001 05:18
        An:     ITU-SG16@mailbag.cps.INTEL.COM
        Betreff:        Firewall/NAT Crossing by H.323/H.248
Folks:
The following Internet draft (draft-davies-fw-nat-traversal-00.txt)
deals
        with the proposal how H.323, H.248, and other applications (e.g.,
SIP) can
        cross the firewalls and NATs that do not require any changes in NATs
and
        firewalls.
I would request the members that it may be worthwhile to look into
the
        proposal.
(I would also propose the authors to see whether this can be
presented in
        the ITU-T SG16 for possible examination. If attendance is a problem
by the
        authors, whether Rapporteurs, as they did in the past, can help in
        collaboration with the authors in the presenting the proposal.)
Best regards,
        Radhika R. Roy
        AT&T
-----Original Message-----
        From: Steve Davies [mailto:SDavies@Ridgeway-Sys.com]
        Sent: Tuesday, March 20, 2001 8:45 PM
        To: mshore@cisco.com
        Cc: sob@harvard.edu; Steve Davies; midcom@ietf.com;
        sip@lists.bell-labs.com
        Subject: [SIP] Contribution to Midcom WG
Melinda,
Please excuse this email at the 11th hour. I've taking the liberty
of
        copying it to the SIP and Midcom WGs in order to maximise the
opportunity
        for discussion.
Ridgeway Systems & Software have just completed an Internet draft
for the
        traversal of non-protocol aware firewalls and NATs by
session-oriented
        protocols such as H.323, SIP and H.248/Megaco. The draft is the
culmination
        of the last 2 years of research and development within Ridgeway. The
methods
        outlined in the draft have been implemented and proven to work. The
main
        benefit to the Internet and Telecommunications community of the
method
        outlined in this draft is that it is protocol agnostic - a single
method can
        carry multiple protocols. Until it is available through the system
it is
        available from http://www.vxserver.com/standards/  - username is
'standards'
        password is 'stevedavies'.
The method outlined in the draft is probably ahead of where Midcom
is at
        this point. I bring it to your attention now because I see similar
        initiatives within the SIP WG and because I would like to suggest to
the
        Midcom WG that there are at least 2 classes of problem with
potentially
        multiple solutions to address and capture. My basic premise is that
it is
        not just a FW/NAT problem to address, but a FW/NAT + deployment set
of
        problems.
Class A:
        This class of problem is characterised by the fact that it is not
possible
        or it is undesirable to upgrade the firewalls and NAT devices.
Typically,
        NAPT is being used and Internet data and voice/video packets are
transported
        on the same network (at some point, e.g. the LAN). Security must not
be
        compromised. Examples deployments include residential and enterprise
access
        to the Converged Network via an ISP.
The Traversal method Ridgeway has developed addresses this class of
problem.
Class B:
        This class of problem is characterised by the fact that it is
possible to
        upgrade existing or deploy new equipment to transport voice/video
over IP.
ALGs in firewalls and NATs is one solution to this class of problem.
It seems that the approach within Midcom is to formalise and
abstract ALGs
        such that one method suits all protocols. However, this doesn't
address
        deployments in Class A.
My colleague, Pete Cordell, and I will be in Minneapolis from
Wednesday thru
        Friday and shall be attending the Midcom WG where we hope such
requirements
        and issues will be raised and captured.
Please feel free to contact me should you want to discuss this
offline.
Kindest regards
Steve
Steve Davies
        Chief Technical Officer
        Ridgeway Systems and Software
        Email: mailto:sdavies@ridgeway-sys.com
        Web:  www.ridgeway-sys.com
        Tel  B: +44 (0) 118 938 1114
        Tel H: +44  (0) 1285 770979
        US cell: +1 512 771 7160
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Roy, Radhika R, ALCOO

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