Re: [mdnsext] mdnsext & SLP

Michael Sweet <> Fri, 21 June 2013 15:26 UTC

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From: Michael Sweet <>
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Date: Fri, 21 Jun 2013 11:26:22 -0400
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To: Garret Peirce <>
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Subject: Re: [mdnsext] mdnsext & SLP
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On Jun 21, 2013, at 11:05 AM, Garret Peirce <> wrote:
> I'm curious why SLP is not a potential solution to the hurdle of 'service discovery beyond the local link'.

Speaking from experience, SLP is painful without a DA, and you need an accessible DA on every network segment.

> Ignoring client support for the moment, SLP seems like an existing, defined mechanism for scalable SD.

AFAIK, SLP does not solve the multiple-network problem.

> It seems this draft aims to develop an alternate method to do so.

Well, I think the goal is to come up with a solution to the multiple-network problem that scales while retaining dynamic registration/advertising of services.  The focus may be on mDNS and DNS-SD (because that drove the petition to fix things...) but I suspect that solutions for DNS-SD and mDNS would also work for extending SLP.

Michael Sweet, Senior Printing System Engineer, PWG Chair