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


 
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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
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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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NETWORK_NAMESPACES(7)					     Linux Programmer's Manual					     NETWORK_NAMESPACES(7)

NAME
network_namespaces - overview of Linux network namespaces DESCRIPTION
Network namespaces provide isolation of the system resources associated with networking: network devices, IPv4 and IPv6 protocol stacks, IP routing tables, firewall rules, the /proc/net directory (which is a symbolic link to /proc/PID/net), the /sys/class/net directory, various files under /proc/sys/net, port numbers (sockets), and so on. A physical network device can live in exactly one network namespace. When a network namespace is freed (i.e., when the last process in the namespace terminates), its physical network devices are moved back to the initial network namespace (not to the parent of the process). A virtual network (veth(4)) device pair provides a pipe-like abstraction that can be used to create tunnels between network namespaces, and can be used to create a bridge to a physical network device in another namespace. When a namespace is freed, the veth(4) devices that it contains are destroyed. Use of network namespaces requires a kernel that is configured with the CONFIG_NET_NS option. SEE ALSO
nsenter(1), unshare(1), clone(2), veth(4), proc(5), sysfs(5), namespaces(7), user_namespaces(7), brctl(8), ip(8), ip-address(8), ip- link(8), ip-netns(8), iptables(8), ovs-vsctl(8) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2018-02-02 NETWORK_NAMESPACES(7)