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Full Discussion: List of Ports being used.
Operating Systems Solaris List of Ports being used. Post 302411336 by pupp on Thursday 8th of April 2010 09:49:16 AM
Old 04-08-2010
Quote:
a) Is it possible that a port no., not defined in /etc/services, be used by an application.
yes

/etc/services does not necessarily show what ports are open on your specific host. its more a repository for translating port numbers to more meaningful, human readable names... and those that are properly registered with the iana. (NIS maps "services.byname" and the NIS+ table "services" are counterparts).

if you run `netstat -a`, /etc/services will be used to translate a port number to a meaningful name. if you run `netstat -an`, port numbers will not be translated.

you can change /etc/services to whatever you like.
 

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services(4)							   File Formats 						       services(4)

NAME
services - Internet services and aliases SYNOPSIS
/etc/inet/services /etc/services DESCRIPTION
The services file is a local source of information regarding each service available through the Internet. The services file can be used in conjunction with or instead of other services sources, including the NIS maps "services.byname" and the NIS+ table "services." Programs use the getservbyname(3SOCKET) routines to access this information. The services file contains an entry for each service. Each entry has the form: service-name port/protocol aliases service-name This is the official Internet service name. port/protocol This field is composed of the port number and protocol through which the service is provided, for instance, 512/tcp. aliases This is a list of alternate names by which the service might be requested. Fields can be separated by any number of SPACE and/or TAB characters. A number sign (#) indicates the beginning of a comment; any charac- ters that follow the comment character up to the end of the line are not interpreted by routines which search the file. Service names may contain any printable character other than a field delimiter, a NEWLINE, or a comment character. Any changes to a port assignment do not affect the actual port registration of the service. FILES
/etc/nsswitch.conf configuration file for name-service switch SEE ALSO
getservbyname(3SOCKET), inetd.conf(4), nsswitch.conf(4) NOTES
/etc/inet/services is the official SVR4 name of the services file. The symbolic link /etc/services exists for BSD compatibility. SunOS 5.10 12 Oct 2000 services(4)
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