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Date:	Sun, 21 Feb 2010 09:58:54 +0800
From:	Cong Wang <>
To:	Octavian Purdila <>
CC:	David Miller <>,
	Linux Kernel Network Developers <>,
	Linux Kernel Developers <>,
	Neil Horman <>,
	Eric Dumazet <>,
	"Eric W. Biederman" <>
Subject: Re: [net-next PATCH v5 0/3] net: reserve ports for applications using
 fixed port numbers

Octavian Purdila wrote:
> On Saturday 20 February 2010 10:11:40 you wrote:
>> 2) I hope you could add some documentation to show the relations
>>     between ip_local_port_range and ip_local_reserved_ports.
> How does this sound:
> ip_local_reserved_ports - list of comma separated ranges
>         Specify the ports which are reserved for known third-party
>         applications. These ports will not be used by automatic port
>         assignments (e.g. when calling connect() or bind() with port
>         number 0). Explicit port allocation behavior is unchanged.
>         The format used for both input and output is a comma separated
>         list of ranges (e.g. "1,2-4,10-10" for ports 1, 2, 3, 4 and
>         10). Writing to the file will clear all previously reserved
>         ports and update the current list with the one given in the
>         input.
>         Note that ip_local_port_range and ip_local_port_range settings
>         are independent and both are considered by the kernel when
>         determining which ports are available for automatic port
>         assignments.
>         You can reserve ports which are not in the current
>         ip_local_port_range, e.g.:
>         $ cat /proc/sys/net/ipv4/ip_local_port_range
>         32000   61000
>         $ cat /proc/sys/net/ipv4/ip_local_reserved_ports
>         8080,9148
>         although this is redundant. However such a setting is useful
>         if later the port range is changed to a value that will
>         include the reserved ports.

This looks fine for me.


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