Re: [tram] FW: New Version Notification for draft-patil-tram-turn-serv-disc-00.txt

"Prashanth Patil (praspati)" <praspati@cisco.com> Tue, 11 February 2014 17:40 UTC

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From: "Prashanth Patil (praspati)" <praspati@cisco.com>
To: Simon Perreault <simon.perreault@viagenie.ca>, "tram@ietf.org" <tram@ietf.org>
Thread-Topic: [tram] FW: New Version Notification for draft-patil-tram-turn-serv-disc-00.txt
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Date: Tue, 11 Feb 2014 17:40:35 +0000
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Subject: Re: [tram] FW: New Version Notification for draft-patil-tram-turn-serv-disc-00.txt
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Hi Simon,

On 2/11/14 7:47 PM, "Simon Perreault" <simon.perreault@viagenie.ca> wrote:

>Le 2014-02-11 00:26, Tirumaleswar Reddy (tireddy) a écrit :
>> This document describes two mechanisms to auto discover TURN server.
>>Please review and provide your valuable comments.
>
>Nice. A few comments/questions...
>
>1. Does WPAD play any role in this? Why/why not? (DHCP options are often
>inaccessible/very hard to get to from end-user applications, namely
>browsers.)

For WPAD, my understanding is that some browsers use DHCP Inform to
request and obtain information from a DHCP server for use in their local
configuration.
WPAD is a viable option, given that it's used quite a bit. I suppose we
could suggest it as an option in the draft, but WPAD is not standardized.


>
>2. About the anycast mechanism:
>
>   When a client requires TURN services, it sends a TURN allocate
>   request to the assigned anycast address.  The responding TURN anycast
>   server puts its own unicast address as the source address in the
>   reply message.
>
>That won't work because it won't get through most firewalls and many
>NATs. The response's 5-tuple has to be the same as the request's.
>
>I suggest you look into the 300 (Try Alternate) response mechanism. The
>response would contain the unicast address in an ALTERNATE-SERVER
>attribute. See also RFC 5766 section 2.9.

Good point, will update.

>
>3. It would be nice to make anycast work with TCP.

Yep. However, do we really need it in the context of discovery? If a
client can discover a server using UDP, the client can choose to
subsequently contact the same server over TCP.


>
>4. In the IANA Considerations section, it seems you are requesting a
>single IPv4 address and a single IPv6 address. If we want anycast to
>work across AS boundaries, we need to request a /24 and a /48,
>respectively. I think we want that, so that TURN service can easily be
>provided by a third party. (On the other hand, single addresses are
>interesting security-wise in that they won't travel very far in BGP.)

-Prashanth

>
>Simon
>-- 
>DTN made easy, lean, and smart --> http://postellation.viagenie.ca
>NAT64/DNS64 open-source        --> http://ecdysis.viagenie.ca
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>
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