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Ip_local_reserved_ports - How do i verify that kernel does not allow these ports to others services


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Ip_local_reserved_ports - How do i verify that kernel does not allow these ports to others services

Hi Team,

I am using RHEL 7.3.
I had added few port numbers in
Code:
/proc/sys/net/ipv4/ip_local_reserved_ports.

Now how do I verify that kernel does not allow to a service which requests random ports for its services.

Thanks in Advance
Hariharan Gopal
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SERVICES_MKDB(8)					    BSD System Manager's Manual 					  SERVICES_MKDB(8)

NAME
services_mkdb -- generate the services database
SYNOPSIS
services_mkdb [-b | -l] [-q] [-o database] [file] services_mkdb -u [file]
DESCRIPTION
The services_mkdb utility creates a db(3) database for the specified file. If no file is specified, then /etc/services is used. The data- base is installed into /var/db/services.db. The file must be in the correct format (see services(5)). The options are as follows: -b Use big-endian byte order for database metadata. -l Use little-endian byte order for database metadata. -o database Put the output databases in the named file. -q Do not warn about duplicate services. -u Print the services file to stdout, omitting duplicate entries and comments. The databases are used by the C library services routines (see The -b and -l flags are mutually exclusive. The default byte ordering is the current host order. getservent(3)).
FILES
/var/db/services.db The current services database. /var/db/services.db.tmp A temporary file. /etc/services The current services file.
EXIT STATUS
The services_mkdb utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
db(3), getservent(3), services(5)
BUGS
Because services_mkdb guarantees not to install a partial destination file it must build a temporary file in the same file system and if suc- cessful use rename(2) to install over the destination file. If services_mkdb fails it will leave the previous version of the destination file intact.
BSD
April 4, 2010 BSD

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