W3C home > Mailing lists > Public > public-webrtc@w3.org > June 2013

Re: Allowing RTCIceServer to contain multiple URLs

From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 7 Jun 2013 13:26:45 -0700
Message-ID: <CABcZeBMA6cezCwVdjAYM8kP_b46P4vm702S6h=NXcZHqJN-9=Q@mail.gmail.com>
To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
Cc: Justin Uberti <juberti@google.com>, Martin Thomson <martin.thomson@gmail.com>, "public-webrtc@w3.org" <public-webrtc@w3.org>
On Fri, Jun 7, 2013 at 12:12 PM, Cullen Jennings (fluffy)
<fluffy@cisco.com>wrote:

> - but as you know I"m pretty skeptical about some the conclusions of some
> of the  published research on web and DNS.
>

I'm not sure what to do with this.

I'm sure that *some* of the published research on web and DNS--like
some of the research on just about anything---deserves skepticism. Is there
a
specific piece of research you are skeptical of or are you just casting
general aspersions on everything published in the past 25 years?

-Ekr



> On Jun 7, 2013, at 11:44 PM, "Eric Rescorla" <ekr@rtfm.com> wrote:
>
>
>
>
> On Fri, Jun 7, 2013 at 4:11 AM, Cullen Jennings (fluffy) <fluffy@cisco.com
> > wrote:
>
>>
>> On Jun 7, 2013, at 11:55 AM, Eric Rescorla <ekr@rtfm.com>
>>  wrote:
>>
>> >
>> >
>> >
>> > On Thu, Jun 6, 2013 at 9:42 PM, Cullen Jennings (fluffy) <
>> fluffy@cisco.com> wrote:
>> >
>> > On Jun 6, 2013, at 10:30 PM, Justin Uberti <juberti@google.com> wrote:
>> >
>> > > The sections you are pointing to discuss the use of SRV to perform a
>> lookup of a STUN or TURN server for a particular domain. How did you see
>> this working with a TURN URI?
>> > >
>> > > That is, if the TURN URI specifies turn:foo.example.com, are you
>> expecting the browser to do a SRV lookup of _turn._udp.foo.example.com,
>> _turn._tcp.foo.example.com, and _turns._tcp.foo.example.com - each of
>> which will return a DNS name that will require another query to obtain the
>> IP address?
>> > >
>> > >
>> >
>> > Yes. Pretty much. Keep in mind the server has no idea which will works
>> so you are going to need to try the transports to see what works.
>> >
>> > A TURN client could lookup the UDP, start trying that  and in parallel
>> go get DNS for tcp and test the TCP. If UPD (or TCP) does not work, it
>> takes awhile to detect so parallel works out better.
>> >
>> > Do we have measurements on the SRV success rate from typical browser
>> clients?
>>
>>  Any reason to think it might be less than say A records?
>
>
>  Yes. The Web doesn't work without A records but it works just fine w/o
> SRV.
>
>  I've heard fairly negative reports about TXT, so naturally this is a
> concern.
>
>   -Ekr
>
>
Received on Friday, 7 June 2013 20:27:52 UTC

This archive was generated by hypermail 2.3.1 : Monday, 23 October 2017 15:19:33 UTC