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Operating Systems Linux Ip_local_reserved_ports - How do i verify that kernel does not allow these ports to others services Post 303008777 by hariharan.gopal on Wednesday 6th of December 2017 02:21:17 AM
Old 12-06-2017
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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semanage-port(8)														  semanage-port(8)

NAME
semanage port- SELinux Policy Management port mapping tool SYNOPSIS
semanage port [-h] [-n] [-N] [-s STORE] [ --add -t TYPE -p PROTOCOL -r RANGE port_name | port_range | --delete -p PROTOCOL port_name | port_range | --deleteall | --extract | --list [-C] | --modify -t TYPE -p PROTOCOL -r RANGE port_name | port_range ] DESCRIPTION
semanage is used to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources. semanage port controls the port number to port type defitions. OPTIONS
-h, --help show this help message and exit -n, --noheading Do not print heading when listing the specified object type -N, --noreload Do not reload policy after commit -S STORE, --store STORE Select an alternate SELinux Policy Store to manage -C, --locallist List local customizations -a, --add Add a record of the specified object type -d, --delete Delete a record of the specified object type -m, --modify Modify a record of the specified object type -l, --list List records of the specified object type -E, --extract Extract customizable commands, for use within a transaction -D, --deleteall Remove all local customizations -t TYPE, --type TYPE SELinux type for the object -r RANGE, --range RANGE MLS/MCS Security Range (MLS/MCS Systems only) SELinux Range for SELinux login mapping defaults to the SELinux user record range. SELinux Range for SELinux user defaults to s0. -p PROTO, --proto PROTO Protocol for the specified port (tcp|udp) or internet protocol version for the specified node (ipv4|ipv6). EXAMPLE
List all port defitions # semanage port -l Allow Apache to listen on tcp port 81 # semanage port -a -t http_port_t -p tcp 81 Allow sshd to listen on tcp port 8991 # semanage port -a -t ssh_port_t -p tcp 8991 SEE ALSO
selinux (8), semanage (8) AUTHOR
This man page was written by Daniel Walsh <dwalsh@redhat.com> 20130617 semanage-port(8)
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