RE: [midcom] draft-ietf-midcom-requirements-01.txt
"Christian Huitema" <huitema@windows.microsoft.com> Mon, 25 June 2001 18:53 UTC
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Subject: RE: [midcom] draft-ietf-midcom-requirements-01.txt
Date: Mon, 25 Jun 2001 10:47:43 -0700
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Thread-Topic: [midcom] draft-ietf-midcom-requirements-01.txt
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From: Christian Huitema <huitema@windows.microsoft.com>
To: richard.swale@bt.com, mshore@cisco.com, christopher.a.martin@wcom.com, midcom@ietf.org
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I wrote the scenario draft precisely so we could check that what we are designing enables the use that we are planning. In section 2.3.1, "Explicit call from an internal host", I wrote: We should note that, at step 2, the internal server must learn the external mappings of the internal address and ports; at this stage, it does no know the IP address and ports of the third party. This is very much a fact of life. If you are unwilling to open the hole before you know the complete five-tuple, then there is a race condition between opening the hole and receiving the first audio packets; announcements and first words will sometimes be clipped. A few lines letter, the scenario text explains that: The description assumes that the hosts use the same UDP ports in both direction of the media communication. This is not necessarily the case. The source IP address may be unpredictable in the case of multi-homed hosts; the source port may be systematically different from the receive port in some implementation, e.g. parallel processing of the send and receive channels by different software or hardware components. SIP and SDP, as they are defined today, only provide the address at which a host is ready to receive data. They do not document the sending address. The requirement document already mention that the protocol should allow use of wildcards for specifying pinholes. We may expect this to be used frequently. -- Christian Huitema > -----Original Message----- > From: richard.swale@bt.com [mailto:richard.swale@bt.com] > Sent: Monday, June 25, 2001 10:13 AM > To: Christian Huitema; mshore@cisco.com; > christopher.a.martin@wcom.com; midcom@ietf.org > Subject: RE: [midcom] draft-ietf-midcom-requirements-01.txt > > > Christian, > > > The examples about RTP have outlined the fact that RTP pin-hole > > typically are of the form "allow data from unknown sources > and ports > > to reach a specific address and port." It is true that the > average RTP > > session will require 2 pinholes. But in this case, the direction is > > expressed trivially; there is no need for a multi-value field. > > > > While possible as an option I don't think openning ports to > allow allow data > from unknown sources and ports is necessarily wise as a > security policy for > a complete solution. We should allow for more precise cases > where a more > strict policy is applied( open an RTP stream from THIS source > and port to > THAT source and port.), shouldn't we? > > regards > > Richard > > _______________________________________________ > midcom mailing list > midcom@ietf.org > http://www.ietf.org/mailman/listinfo/midcom > _______________________________________________ midcom mailing list midcom@ietf.org http://www.ietf.org/mailman/listinfo/midcom
- [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- [midcom] Re: draft-ietf-midcom-requirements-01.txt Brian E Carpenter
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Andrew Molitor
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Andrew Molitor
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Tim Dorcey
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Andrew Molitor
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Melinda Shore
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Melinda Shore
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Melinda Shore
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Eliot Lear
- RE: [midcom] draft-ietf-midcom-requirements-01.txt richard.swale
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Cedric Aoun
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christopher A. Martin
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Melinda Shore
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- RE: [midcom] draft-ietf-midcom-requirements-01.txt richard.swale
- RE: [midcom] draft-ietf-midcom-requirements-01.txt richard.swale
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Bob Penfield
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Melinda Shore
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Andrew Molitor
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Andrew Molitor
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Sanjoy Sen
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Christian Huitema
- Re: [midcom] draft-ietf-midcom-requirements-01.txt Melinda Shore
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Sanjoy Sen
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Zmolek, Andrew (Andrew)
- RE: [midcom] draft-ietf-midcom-requirements-01.txt Fleischman, Eric W
- [midcom] Re: draft-ietf-midcom-requirements-01.txt Brian E Carpenter
- Re: [midcom] Re: draft-ietf-midcom-requirements-0… John Ladwig
- RE: [midcom] Re: draft-ietf-midcom-requirements-0… Cedric Aoun
- Re: [midcom] Re: draft-ietf-midcom-requirements-0… Bob Penfield
- Re: [midcom] Re: draft-ietf-midcom-requirements-0… Melinda Shore
- Re: [midcom] Re: draft-ietf-midcom-requirements-0… Brian E Carpenter
- Re: [midcom] Re: draft-ietf-midcom-requirements-0… Scott Brim