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

9 More Discussions You Might Find Interesting

1. Linux

Unload kernel module at boot time (Debian Wheezy 7.2, 3.2.0-4-686-pae kernel)

Hi everyone, I am trying to prevent the ehci_hcd kernel module to load at boot time. Here's what I've tried so far: 1) Add the following line to /etc/modprobe.d/blacklist.conf (as suggested here): 2) Blacklisted the module by adding the following string to 3) Tried to blacklist the module...

2. Shell Programming and Scripting

Script to Start services based on dependent services on other AIX machine

Hi, I just started working on a script. After my research, i found a command which can help me: AIM: To build a script which starts the services (Services 1) on server 1 automatically whenever its down. And it has a dependency on other service (Service 2) on Server 2. So my script has to...

3. Red Hat

Restart of services if port no is changed in /etc/services in RHEL

I had a doubt if any services need to be restarted if port no in /etc/services in an RHEL setup is changed. For eg, the port no of 443 for SSL may need to be changed. I hope my query is clear whether any services need to be restarted if port no in /etc/services is changed. Please revert with...

4. UNIX for Dummies Questions & Answers

open ports and services

just a quick question: a. whats the simplest command to check open port and the corresponding services? example: bash-2.05# netstat -an | grep LISTEN *.199 *.* 0 0 49152 0 LISTEN *.8989 *.* 0 0 49152 ...

5. Solaris

Which file is read by kernel to set its default system kernel parameters values?

Hi gurus Could anybody tell me which file is read by kernel to set its default system kernal parameters values in solaris. Here I am not taking about /etc/system file which is used to load kernal modules or to change any default system kernal parameter value Is it /dev/kmem file or something...

6. Linux

Supermicro(dual core) server getting rebooted after "decompressing the kernel;booting the kernel" me

supermicro(dual core) server getting rebooted after "decompressing the kernel;booting the kernel" message comes. I tried giving acpi=off to the kernel command line but same problem.It shows everything ok and no problem with memory and processors and power supplies.Wt could be the reason? It has...

7. SuSE

max number of slabs per kernel module (kernel 2.6.17, suse)

Hi All, Is there a max number of slabs that can be used per kernel module? I'm having a tough time finding out that kind of information, but the array 'node_zonelists' (mmzone.h) has a size of 5. I just want to avoid buffer overruns and other bad stuff. Cheers, Brendan

8. UNIX for Dummies Questions & Answers

ports and services

hello all, in order for me to close ports and remove services that could be a danger to my system i have edited the /etc/initd.conf file, /etc/system file, and renamed some of the r commands. However i wanted to know if anyone knows how to turn off all services and close ALL known ports, so i...

9. UNIX for Dummies Questions & Answers

inet services, open ports etc

When I scan my linux box for open ports, i have several of them, but they shouldn't be open. I removed the lines for them in /etc/services, and left just stuff like telnet, ssh, ftp. Why are they still open? I've restarted the network, and I've even restarted my box, but they still apear as open....

LEARN ABOUT DEBIAN

portreserve

PORTRESERVE(1)						   TCP port reservation utility 					    PORTRESERVE(1)

NAME

       portreserve - reserve ports to prevent portmap mapping them

SYNOPSIS

       portreserve

DESCRIPTION

       The portreserve program aims to help services with well-known ports that lie in the bindresvport range. It prevents portmap (or other
       programs using bindresvport) from occupying a real service's port by occupying it itself, until the real service tells it to release the
       port (generally in its init script).

       It is intended that portreserve runs from an initscript of its own, and services wishing to interact with it should use portrelease.

       When the portreserve daemon is started, it examines the /etc/portreserve/ directory. Each file not containing "."  or "~" in its name is
       considered to be a service configuration file, and must contain a service name (as listed in /etc/services) or a port number. UDP services
       may be specified by appending "/udp" to the service name, and TCP services by "/tcp". Several services may be specified, one per line.

       For example, /etc/portreserve/cups might contain the string "ipp" or, equivalently, "ipp/tcp" and "ipp/udp" on separate lines.

       For each service configuration file, a socket is created and bound to the appropriate port. A service wishing to bind to its port must
       first run portrelease, which instructs portreserve to release the port associated with the service.

       Once all the reserved ports have been released, the daemon exits.

FILES

       /etc/portreserve/*
	   Service configuration files

       /var/run/portreserve/socket
	   communication socket for portrelease

SEE ALSO

       portrelease(1)

AUTHOR

       Tim Waugh <twaugh@redhat.com>
	   Author.

portreserve							    1 July 2008 						    PORTRESERVE(1)

Linux