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Date:	Fri, 5 Feb 2010 18:08:15 +0900
From:	Tetsuo Handa <>
Subject: Re: [RFC Patch] net: reserve ports for applications using fixed portnumbers

Cong Wang wrote:
> The problem is that there are some existing applications which use
> fixed port number, we don't have chances to change this for them,
> thus making them working is desired, so they want to reserve these
> port for those applications.
> For example, if I have an appliction which uses port 40000, but
> before this application starts, another application gets this port
> number by bind() with port 0 (i.e. chosen by kernel), in this case,
> that application will fail to start. Again, we don't have any chance
> to change the source code of that application.
And there is a utility called "portreserved" (port reserve daemon).

But that utility cannot close the race window between "portreserved stops
reserving local port numbers" and "applications starts using local port
numbers which portreserved was reserving".

Thus, I think people want to have port reservation mechanism inside kernel
(if it has little impact).
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