Re: [rtcweb] [mmusic] TURN server address via DHCP, WGLC of draft-ietf-rtcweb-use-cases-and-requirements-11
Justin Uberti <juberti@google.com> Tue, 08 October 2013 06:17 UTC
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From: Justin Uberti <juberti@google.com>
Date: Mon, 07 Oct 2013 23:17:04 -0700
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To: Karl Stahl <karl.stahl@intertex.se>
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>, draft-ietf-rtcweb-use-cases-and-requirements@tools.ietf.org, "Cullen Jennings (fluffy)" <fluffy@cisco.com>
Subject: Re: [rtcweb] [mmusic] TURN server address via DHCP, WGLC of draft-ietf-rtcweb-use-cases-and-requirements-11
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On Mon, Oct 7, 2013 at 6:21 AM, Karl Stahl <karl.stahl@intertex.se> wrote: > So the WPAD-way of getting a network provider’s TURN server address for > the real (white, global) IP address he has handed out to a user, the > browser would:**** > > - Use STUN to find the global IP address (done anyway in ICE) > How does this get bootstrapped? That is, how is the STUN server found? > **** > > - Do a reverse DNS lookup (instead of the DNS-Based Service Discovery that > is not yet deployed)**** > > - Make a URL based on the hostname from the reverse DNS lookup, e.g. from > 179.sub-174-252-35.myvzw.com, make h ttp://turnad.myvzw.com > I was hoping we could do something simpler, such as using the ISP's configured domain search list, to determine the domain. > **** > > - And there find a list (in JS) of TURN server addresses for the network > provider’s IP addresses**** > > Or would an alternative be to add your own IP address to the URL and get > only your specific TURN server address?**** > > ** ** > > Doing it at this Web level, I think we also should consider clients using > ICE/TURN, but not having the luxury of a JS engine: Would e.g. a SIP client > be able to parse a “JS table” to find his TURN server address easily? Also, > are there long time-outs to be considered when there is no h ttp:// > turned.myvzw.com to be found? > **** > > ** ** > > This method may be easier for a network provider to deploy (I don’t know, > but for local use on a LAN I guess it is). On the other hand, the DNS-Based > Service Discovery method is quick and easy for a WebRTC browser, so that > may be tried as well.**** > > ** ** > > Independent of how we find the network provided TURN server, one advantage > with it is the authentication: The network provider simply sets up the TURN > for usage from the IP addresses he has handed out.**** > > ** ** > > /Karl**** > > ** ** > > *Från:* Justin Uberti [mailto:juberti@google.com] > *Skickat:* den 3 oktober 2013 20:59 > *Till:* Karl Stahl > *Kopia:* Bernard Aboba; Harald Alvestrand; Cullen Jennings (fluffy); > draft-ietf-rtcweb-use-cases-and-requirements@tools.ietf.org; > rtcweb@ietf.org > *Ämne:* Re: [rtcweb] [mmusic] TURN server address via DHCP, WGLC of > draft-ietf-rtcweb-use-cases-and-requirements-11**** > > ** ** > > WPAD already supports DNS-based discovery (in addition to DHCP). If you > have host-95-199-196-65.mobileonline.telia.com as your endpoint hostname, > it will try to get a PAC file from wpad.mobileonline.telia.com.**** > > ** ** > > Since for all practical purposes, TURN is a "UDP proxy", I think it should > be handled similar to other proxy autoconfig mechanisms.**** > > ** ** > > On Mon, Sep 30, 2013 at 5:13 PM, Karl Stahl <karl.stahl@intertex.se> > wrote:**** > > I happily withdraw my suggestion to use DHCP to find a network provider > offered TURN server in favor of the DNS-Based Service Discovery method > (inserted last below). The major problem with the DHCP usage was that you > then also have to do something similar for: RA - Router Advertisement - in > IPv6, addition to the IPCP protocol for PPPoE and something for the mobile > OTT channel – wherever DHCP is NOT the method to give you an IP address.** > ** > > **** > > Further:**** > > > On Thu, Sep 27, 2013 Justin Uberti wrote:**** > > > Agree. I still think that extending PAC files to include TURN > information is the right way to go.**** > > > PAC files can already be discovered via DHCP or DNS, there is no need to > reinvent this wheel.**** > > **** > > >>On Thu, Sep 26, 2013 at 4:55 PM, Cullen Jennings (fluffy) < > fluffy@cisco.com> wrote:**** > > >>I think we need to give some advise to the browsers vendors on what they > should implement to find turn servers**** > > **** > > I Googled a bit on PAC and WPAD and saw that a HTTP proxy config JS file > can be picked up through a URL based on the device name. Similar could work > for finding a TURN server on a LAN, but what about the case with a network > provider offered TURN server? The network provider hands out an IP address > and wants to announce a related TURN server address: – Is there a “PAC-way” > to announce it to a device on a LAN (behind a NAT/firewall)? The device > must find such configuration file based on its public IP address (that he > can find using STUN as in the suggestion below).**** > > **** > > But generally, finding a TURN-server is a network-thing, ICE (or even TURN > not using ICE), not a Web-thing, so for that reason the DNS-Based Service > Discovery method is at a better level. Such method could also be used by > SIP clients (even a Skype client could implement it to benefit from a > real-time path with better quality, if the network provider offers such > path through his TURN server).**** > > **** > > The DNS-Based Service Discovery method should be easy to implement in a > WebRTC browser (doing complex ICE things anyway). The question is rather > how easy it is for the network provider to provision. Do they all do > reverse DNS like with found with mobile operators TeliaSonera and Tele2 in > Sweden? Then it should not be too difficult.**** > > **** > > Or is there yet another better method to announce a TURN server address > with the IP address offered?**** > > **** > > /Karl**** > > **** > > **** > > *Från:* rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] *För *Bernard > Aboba > *Skickat:* den 29 september 2013 02:41 > *Till:* Harald Alvestrand > *Kopia:* rtcweb@ietf.org**** > > > *Ämne:* Re: [rtcweb] TURN server address via DHCP, WGLC of > draft-ietf-rtcweb-use-cases-and-requirements-11**** > > **** > > On Sep 26, 2013 8:46 PM, "Harald Alvestrand" <harald@alvestrand.no> wrote: > **** > > > "So far, neither the POSIX standard nor any OS vendor has offered a > generic facility to access information made available in DHCP packets."*** > * > > **** > > [BA] The Windows DHCP client API does provide this: **** > > > http://msdn.microsoft.com/en-us/library/windows/desktop/aa363351(v=vs.85).aspx > **** > > **** > > In particular, the SendParams argument to the DhcpRequestParams > function can be used to request a particular parameter (e.g. TURN server > address), which will then be returned in the RecdParams variable. **** > > **** > > Nevertheless, I still think that using DHCP to configure the TURN server > address in a browser isn't a good idea. For one thing, since DHCP is > effectively unsecured, this mechanism could be used by a rogue DHCP server > to force traffic to a rogue turnserver. Great for surveillance!**** > > **** > > **** > > On Sep 27, 2013 1:27 AM, "Karl Stahl" <karl.stahl@intertex.se> wrote:**** > > Here comes the suggestion I got from my developer that would allow a > network > provider to offer his TURN server for the WebRTC browser to use. This would > require NO new DHCP-options or similar, and NO OS changes (I do realize > those should be avoided if possible...). > > The idea is still, that whoever is responsible for giving a device an IP > address (the network provider or a LAN administrator) can also announce a > TURN server for the WebRTC browser to use. > > The suggestion is to use RFC6763 (DNS-Based Service Discovery, see chapter > 11) where the network provider (the owner of the IP address) has set up a > DNS PTR record for the TURN server in the in-addr.arpa domain. > > If the device got IP 173.164.252.149, then make a query for the PTR record > for: > _turn._udp.149.252.164.173.in-addr.arpa. > Then the SRV record would return the actual address to the TURN server (and > you may find several for load balancing and failover I guess) > > If the device is on a LAN, the IP 173.164.252.149 to query would be the WAN > IP you get via STUN in the ICE process. But if the LAN administrator > provides a local TURN server, then he also should have blocked STUN in the > firewall, and the browser should query the device's local host address (as > in the ICE procedure) and the local LAN DNS server should answer the query > to give the local TURN server address on the LAN. > > Shouldn't this work to allow network provider to offer his TURN server > "automatically and generally"? > > And wouldn't this work nicely for mobile devices, whenever the device is on > a "WebRTC-ready access" (actually good for everything using ICE), whether > fixed, WiFi or 3G/4G OTT, you get also a TURN server (and the network > provider hopefully offers a prioritized pipe there as one usage of this > mechanism).**** > > Not to slow down every call setup by doing this in the ICE process, I guess > this could be done when starting the browser and when the device gets a new > IP address, to have the TURN server address ready for later use.**** > > /Karl**** > > ** ** >
- [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-and-… Cullen Jennings (fluffy)
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Stefan Håkansson LK
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Magnus Westerlund
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Bernard Aboba
- [rtcweb] TURN server address via DHCP, WGLC of dr… Karl Stahl
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Hutton, Andrew
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Harald Alvestrand
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Karl Stahl
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Bernard Aboba
- [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-and-… Karl Stahl
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Marc Abrams
- [rtcweb] [mmusic] WGLC of draft-ietf-rtcweb-use-c… Karl Stahl
- [rtcweb] [mmusic] TURN server address via DHCP, W… Karl Stahl
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Hutton, Andrew
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Marc Abrams
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Hutton, Andrew
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Hutton, Andrew
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Sergio Garcia Murillo
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Tirumaleswar Reddy (tireddy)
- Re: [rtcweb] TURN server address via DHCP, WGLC o… cb.list6
- Re: [rtcweb] [mmusic] WGLC of draft-ietf-rtcweb-u… Dan Wing
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Karl Stahl
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Chenxin (Xin)
- Re: [rtcweb] additional ICE info Bernard Aboba
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Karl Stahl
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Chenxin (Xin)
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Karl Stahl
- Re: [rtcweb] additional ICE info Dan Wing
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Cullen Jennings (fluffy)
- Re: [rtcweb] additional ICE info Harald Alvestrand
- Re: [rtcweb] additional ICE info Dan Wing
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Karl Stahl
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Harald Alvestrand
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Markus.Isomaki
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Chenxin (Xin)
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Karl Stahl
- Re: [rtcweb] WGLC of draft-ietf-rtcweb-use-cases-… Karl Stahl
- Re: [rtcweb] TURN server address via DHCP, WGLC o… cb.list6
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Cullen Jennings (fluffy)
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Justin Uberti
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Karl Stahl
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Jeremy Laurenson (jlaurens)
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Justin Uberti
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Martin Thomson
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Bernard Aboba
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Jeremy Laurenson (jlaurens)
- [rtcweb] [mmusic] TURN server address via DHCP, W… Karl Stahl
- Re: [rtcweb] [mmusic] WGLC of draft-ietf-rtcweb-u… Magnus Westerlund
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Saverio Vardaro
- Re: [rtcweb] additional ICE info Martin Thomson
- Re: [rtcweb] [mmusic] WGLC of draft-ietf-rtcweb-u… Karl Stahl
- Re: [rtcweb] [mmusic] TURN server address via DHC… Cullen Jennings (fluffy)
- Re: [rtcweb] [mmusic] TURN server address via DHC… Karl Stahl
- Re: [rtcweb] [mmusic] WGLC of draft-ietf-rtcweb-u… Christer Holmberg
- Re: [rtcweb] [mmusic] TURN server address via DHC… Justin Uberti
- Re: [rtcweb] [mmusic] TURN server address via DHC… cb.list6
- [rtcweb] Payload Types assignments was Re: SV: [m… Magnus Westerlund
- Re: [rtcweb] TURN server address via DHCP, WGLC o… Karl Stahl
- Re: [rtcweb] [mmusic] TURN server address via DHC… Karl Stahl
- Re: [rtcweb] [mmusic] WGLC of draft-ietf-rtcweb-u… Karl Stahl
- Re: [rtcweb] [mmusic] TURN server address via DHC… Justin Uberti
- Re: [rtcweb] Payload Types assignments was Re: SV… Karl Stahl
- Re: [rtcweb] Payload Types assignments was Re: SV… Harald Alvestrand
- Re: [rtcweb] Payload Types assignments was Re: SV… BeckW
- Re: [rtcweb] Payload Types assignments was Re: SV… Ted Hardie
- Re: [rtcweb] Payload Types assignments was Re: SV… BeckW
- Re: [rtcweb] Payload Types assignments was Re: SV… Harald Alvestrand
- Re: [rtcweb] Payload Types assignments was Re: SV… Martin Thomson
- Re: [rtcweb] Payload Types assignments was Re: SV… Harald Alvestrand
- Re: [rtcweb] Payload Types assignments was Re: SV… BeckW
- Re: [rtcweb] Payload Types assignments was Re: SV… Martin Thomson
- Re: [rtcweb] Payload Types assignments was Re: SV… Ted Hardie
- Re: [rtcweb] Payload Types assignments was Re: SV… Lee, Richard FTC
- Re: [rtcweb] Payload Types assignments was Re: SV… Dan Wing
- Re: [rtcweb] Payload Types assignments was Re: SV… BeckW
- Re: [rtcweb] Payload Types assignments was Re: SV… Karl Stahl
- [rtcweb] [mmusic] Anycast discovery, Was TURN ser… Karl Stahl
- [rtcweb] [avtext] Payload Types assignments was R… Karl Stahl
- [rtcweb] [tram] Payload Types assignments Karl Stahl
- Re: [rtcweb] [tram] Payload Types assignments Colin Perkins
- Re: [rtcweb] [tram] Payload Types assignments Karl Stahl
- Re: [rtcweb] [tram] Payload Types assignments Magnus Westerlund
- Re: [rtcweb] [tram] Payload Types assignments Charles Eckel (eckelcu)
- Re: [rtcweb] [tram] Payload Types assignments Colin Perkins
- Re: [rtcweb] [tram] Payload Types assignments Harald Alvestrand
- Re: [rtcweb] [tram] Payload Types assignments Karl Stahl
- Re: [rtcweb] [tram] Payload Types assignments Karl Stahl
- Re: [rtcweb] [tram] Payload Types assignments Karl Stahl
- Re: [rtcweb] [tram] Payload Types assignments Harald Alvestrand
- Re: [rtcweb] [tram] Payload Types assignments Karl Stahl