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ip.7: Note some more details about assignment of ephemeral ports 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-04-26 12:20:09 +02:00
parent 509c1c26f0
commit bd8838ad29
1 changed files with 10 additions and 3 deletions
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13
man7/ip.7
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@ -1012,12 +1012,19 @@ was called on a socket that was not not previously bound;
is called on a datagram socket that was not not previously bound.
.RE
.IP
Allocation starts with the first number and ends with the second number.
Note that these should not conflict with the ports used by masquerading
Allocation of ephemeral ports starts with the first number in
.IR ip_local_port_range
and ends with the second number.
If the range of ephemeral ports is exhausted,
then the relevant system call returns an error (but see BUGS)
.IP
Note that the port range in
.IR ip_local_port_range
should not conflict with the ports used by masquerading
(although the case is handled).
Also, arbitrary choices may cause problems with some firewall packet
filters that make assumptions about the local ports in use.
First number should be at least greater than 1024,
The first number should be at least greater than 1024,
or better, greater than 4096, to avoid clashes
with well known ports and to minimize firewall problems.
.\"