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Re: [rtcweb] TURN server address via DHCP, WGLC of draft-ietf-rtcweb-use-cases-and-requirements-11

Bernard Aboba <bernard_aboba@hotmail.com> Sun, 29 September 2013 00:40 UTC

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From: Bernard Aboba <bernard_aboba@hotmail.com>
To: Harald Alvestrand <harald@alvestrand.no>
Date: Sat, 28 Sep 2013 17:40:46 -0700
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] TURN server address via DHCP, WGLC of draft-ietf-rtcweb-use-cases-and-requirements-11
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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!

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