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Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)

"Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com> Wed, 23 March 2016 04:00 UTC

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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, Ben Campbell <ben@nostrum.com>
Thread-Topic: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)
Thread-Index: AQHRMr+3OsGMVtPT80yeJvcykXh0sJ78ORMAgAULK4CAYGGggIAB0KOAgAG5fQCAALIuAIABFVDg
Date: Wed, 23 Mar 2016 04:00:32 +0000
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References: <20151201045818.23491.19134.idtracker@ietfa.amsl.com> <E63559A7-6A37-496C-AAD9-426AB697FD65@nostrum.com> <D2851411.4B35B%rmohanr@cisco.com> <DB9B999A-DAF0-440B-BDD4-445368AFFCE2@cooperw.in> <DAE78890-C8B2-42DE-BCC3-A994CB9AF668@nostrum.com> <1D498CDA-C8B6-4215-A718-7C5302B5CF2D@cooperw.in> <01E4CF3B-6C31-4A97-8155-8DC06443A7C2@nostrum.com> <A6B3CA82-DC74-48AB-80B7-EBF1462A964E@nostrum.com> <D2C25ED1.4E4DA%rmohanr@cisco.com> <23C852C2-1B96-4739-91ED-8B4C0FF97279@cooperw.in> <D314CB23.5573B%rmohanr@cisco.com> <9F61F2A3-355F-4053-B110-3899CF337A4E@nostrum.com> <D316D3F7.55B12%rmohanr@cisco.com>
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Cc: Alissa Cooper <alissa@cooperw.in>, "straw@ietf.org" <straw@ietf.org>, "christer.holmberg@ericsson.com" <christer.holmberg@ericsson.com>
Subject: Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)
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> -----Original Message-----
> From: straw [mailto:straw-bounces@ietf.org] On Behalf Of Ram Mohan R
> (rmohanr)
> Sent: Tuesday, March 22, 2016 10:46 AM
> To: Ben Campbell
> Cc: Alissa Cooper; straw@ietf.org; christer.holmberg@ericsson.com
> Subject: Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-
> srtp-09: (with DISCUSS and COMMENT)
> 
> Hi Ben,
> 
> -----Original Message-----
> From: Ben Campbell <ben@nostrum.com>
> Date: Tuesday, 22 March 2016 at 12:08 AM
> To: Cisco Employee <rmohanr@cisco.com>
> Cc: Alissa Cooper <alissa@cooperw.in>, "straw@ietf.org" <straw@ietf.org>,
> "christer.holmberg@ericsson.com" <christer.holmberg@ericsson.com>
> Subject: Re: [straw] Alissa Cooper's Discuss on
> draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)
> 
> >>NEW:
> >>B2BUAs may be deployed for address hiding or media latching [RFC7362],
> >>although TURN is more often used for this purpose and media latching
> >>is not recommended due to its security properties. Such B2BUAs are
> >>able to perform their functions without requiring termination of
> >>DTLS-SRTP sessions i.e.
> >>these B2BUAs need not act as DTLS proxy and decrypt the RTP payload.
> >
> >I think the statement that TURN is more often used for media latching
> >is at least somewhat aspirational. But I'm okay with that aspiration
> >:-)
> 
> :) Agree. There are more B2BUAs out there in field doing latching than people
> using TURN.
> But I think there is no harm in saying this way.

How about the following text ?
B2BUAs may be deployed for address hiding or media latching [RFC7362], although endpoints can use ICE, only advertise the relayed candidate allocated by the TURN server for address privacy to the remote peer and avoid the security threats discussed in Section 5 of [RFC7362].

-Tiru

> 
> Ram
> >
> >(The reality probably varies by market type and the "purpose" of the
> >latching, but that sort of detail would only be a distraction here.)
> 
> 
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