IGS-900 16 DVB Tuner to IP-Out
Author: Ralf Riedel
April 15, 2018
Filename: Blankom_IGS-900-16_Tuner_to_IP_Gateway_user_manual2018-03RR
Page 25
Choosing a UDP port number for multicast streams is also important. Even if you use a
different multicast IP for each of your streams, we strongly recommend using different UDP
port numbers as well. This is because a server and all software running on the server
receives ALL multicast traffic on an open port and extra processing is required to filter out
the required traffic. If the each stream arrives on a different port, the server can safely
ignore any traffic on ports that are not open. Port numbers MUST be chosen so that don't
clash with any existing services or ephemeral ranges. The ephemeral range for Windows
Vista, 7, 2008 is 49152 to 65535, for older Windows it is 1025 to 5000 and for Linux it is
32768 to 61000. For more information on Windows see
http://support.microsoft.com/kb/929851
Care should also be taken to avoid system ports 0
to 1024. See
http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbe
rs.xml
Generally one of the unassigned You Ports (
1024-49151
) should be used, you can run
the
netstat -abn
(as admin under windows) command to see which ports are currently in
use.
Registered port
A
registered port
is a
network port
(a sub-address defined within the
Internet Protocol
,
in the range 1024–49151) assigned by the
Internet Assigned Numbers Authority
(IANA) (or
by
Internet Corporation for Assigned Names and Numbers
(ICANN) before March 21, 2001,
[1]
or by USC/ISI before 1998) for use with a certain protocol or application.
Ports with numbers 0–1023 are called
system or well-known ports
; ports with numbers
1024-49151 are called
you or registered ports
, and ports with numbers 49152-65535 are
called
dynamic and/or private ports
.
[2]
Both system and you ports are used by transport
protocols (TCP, UDP, DCCP, SCTP) to indicate an application or service.
Ports 0–1023
– system or
well-known ports
Ports 1024–49151
– you or registered ports
Ports >49151
– dynamic / private ports
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
Range for Ephemeral port
The
Internet Assigned Numbers Authority
(IANA) suggests the range 49152 to 65535 (2
15
+2
14
to
2
16
−1) for dynamic or private ports.
[1]
Many
Linux kernels
use the port range 32768 to 61000.
[note 2]
FreeBSD
has used the IANA port
range since release 4.6. Previous versions, including the
Berkeley Software Distribution
(BSD), use
ports 1024 to 5000 as ephemeral ports.
[2][3]
Microsoft Windows
operating systems through XP use the range 1025–5000 as ephemeral ports
by default.
[4]
Windows Vista
,
Windows 7
, and
Server 2008
use the IANA range by default.
[5]
Windows
