Avaya B5800 Bedienungsanleitung PDF herunterladen (Seite 278)

• Well known ports are those numbered from 0 through 1023.

• Registered ports are those numbered from 1024 through 49151

• Dynamic ports are those numbered from 49152 through 65535

The well known and registered ports are assigned by IANA (Internet Assigned Numbers

Authority) and are found at

http://www.iana.org/assignments/port-numbers.

Well known ports

For the purpose of providing services to unknown clients, a service listen port is defined. This

port is used by the server process as its listen port. Common services often use listen ports in

the well known port range. A well known port is normally active meaning that it is “listening” for

any traffic destined for a specific application. For example, well known port 23 on a server is

actively waiting for a data source to contact the server IP address using this port number to

establish a Telnet session. Well known port 25 is waiting for an email session, etc. These ports

are tied to a well understood application and range from 0 to 1023.

In UNIX and Linux operating systems, only root may open or close a well known port. Well

known ports are also commonly referred to as privileged ports.

Registered ports

Unlike well known ports, these ports are not restricted to the root user. Less common services

ports used by Avaya in this range include: 1719/1720 for H.323, 5060/5061 for SIP, 2944 for

H.248 and others. The registered port range is 1024 – 49151. Even though a port is registered

with an application name, industry often uses these ports for different applications. Conflicts

can occur in an enterprise when a port with one meaning is used by two servers with different

meanings.

Dynamic ports

Dynamic ports, sometimes called private ports, are available to use for any general purpose.

This means there are no meanings associated with these ports (similar to RFC 1918 IP Address

Usage). These are the safest ports to use because no application types are linked to these

ports. The dynamic port range is 49152 – 65535.

Sockets

A socket is the pairing of an IP address with a port number. An example would be

192.168.5.17:3009, where 3009 is the socket number associated with the IP address. A data

flow, or conversation, requires two sockets – one at the source device and one at the

destination device. The data flow then has two sockets with a total of four logical elements.

Each data flow must be unique. If one of the four elements is unique, the data flow is unique.

The following three data flows are uniquely identified by socket number and/or IP address.

Avaya port matrix for B5800 Branch Gateway and SIP phones

278 Implementing B5800 Branch Gateway for a CS 1000 Configuration October 2012

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Avaya B5800 Bedienungsanleitung Seite 278