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Date:	Tue, 10 Nov 2009 17:53:43 +0000
From:	Ben Hutchings <>
To:	Chris Friesen <>
Cc:, Linux kernel <>
Subject: Re: sunrpc port allocation and IANA reserved list

On Tue, 2009-11-10 at 11:43 -0600, Chris Friesen wrote:
> By default sunrpc ports are allocated at random in the range 665-1023U.
>  However, there are many ports within this range which have been
> reserved by the IANA (and others like port 921 which are not formally
> reserved but are "well-known").
> Given that a userspace application can be stopped and restarted at any
> time, and a sunrpc registration can happen at any time, what is the
> expected mechanism to prevent the kernel from allocating a port for use
> by sunrpc that reserved or well-known?
> Apparently Redhat and Debian have distro-specific ways of dealing with
> this, but is there a standard solution?  Should there be?
> The current setup seems suboptimal.

I believe both RH and Debian are using the same implementation:


Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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