Re: ip_local_port_range

From: Albert D. Cahalan (acahalan@cs.uml.edu)
Date: Sat Apr 01 2000 - 02:57:28 EST


David S. Miller writes:
>> From: "Albert D. Cahalan" <acahalan@cs.uml.edu>

>> Why would we use fewer ports, especially when it leads to
>> reduced performance? We aren't even in the legal range.
>
> Because it is a system resource and a protocol correctness
> issue, TIME_WAIT state has a specific purpose and machines
> with lower amounts of ram should not be using such a large
> portion of the available port space.

That addresses the size issue, but what about the range?
According to the IANA (http://www.iana.org/numbers.html)
port assignments are as follows:

  The Well Known Ports are those from 0 through 1023.
  The Registered Ports are those from 1024 through 49151.
  The Dynamic and/or Private Ports are those from 49152 through 65535.

So a range of 51024 to 54999 would be OK to use.
There are hundreds or thousands of services registered
in the current Linux range.

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