Any knowledge for sysctl? Post: 12937

Sponsored Content

Special Forums IP Networking Any knowledge for sysctl? Post 12937 by developer on Wednesday 9th of January 2002 12:03:11 PM

01-09-2002

Registered User

Any knowledge for sysctl?

HI folks. I am developing a protocol and I need to bind to an IP address that is not configured to my machine. The problem is with bind(). The sysctl system call seamed to overcome the problem of bind if you set the proc/sys/net/ipv4/ip_nonlocal_bind flag. Although I tryed to set the flag either from command line by writing sysctl -w net.ipv4.ip_nonlocal_bind=1, or echo 1>proc/sys/net/ipv4/ip_nonlocal_bind, or programmatically by using the command sysctl(), or by seting its value from the /etc/sysctl.conf file, bind still generates an error. Does anybody have any idea of why this is happening? Is there any other way to bind to a non local IP address?

PS. In the kernel configuration the sysctl support(CONFIG_SYSCTL) is enabled together with the /proc file system support (CONFIG_PROC_FS).

developer

View Public Profile for developer

Find all posts by developer

7 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

unix knowledge

I am a new Unix user looking for ways, other than time, to become an effective unix administrator. All sugestions welcome. Thanks

2. UNIX for Dummies Questions & Answers

How to get the knowledge in UNIX? Suggest me . Please.

Hai, friends. In one exam which i have to attend in the month of january, they asked "knowledge of c and unix are required" . I am beginner to unix, even i dont know from where to start . Please suggest me what to do , to get through the exam and interview. I have already downloaded...

3. AIX

knowledge

Dear All Kindly provide me with a difference between hdiskpower and hdisk regards

4. Shell Programming and Scripting

Knowledge

Can somebody explain me the following part within a awk command: awk '{for(i=1;i<=NF;i++) if ($i=="mm")c++} Can somebody please explain me the part (i=1;i<=NF;i++) ????:D:D:D:D

5. Linux

Anyone with Blitz PHP knowledge

Blitz PHP I am having trouble installing Blitz PHP blitz-0.6.10.tar.gz Here is what i did: cd /tmp wget blitz-0.6.10.tar.gz tar zxfv blitz-0.6.10.tar.gz cd blitz-0.6.10 And then I tried ./configure Output: -bash: No such file in directory make Output: No targets in the...

6. UNIX for Dummies Questions & Answers

sysctl help needed.(Server Hardening).

As per Hardening guide for the server. ICMP Broadcast Response: The kernel parameter icmp_echo_ignore_broadcasts must match to 1 However when i check the value of icmp_echo_ignore_broadcasts it thrown an error as unkonwn key. # sysctl icmp_echo_ignore_broadcasts error:...

7. Shell Programming and Scripting

programming knowledge

Hi Friends, I know very well the basic commands of Unix but i want to concentrate on unix shell programming can you please how to learn and suggest me how to become comfortable level. Thanks in advance

LEARN ABOUT REDHAT

sysctl

SYSCTL(8)																 SYSCTL(8)

NAME

       sysctl - configure kernel parameters at runtime

SYNOPSIS

       sysctl [-n] [-e] variable ...
       sysctl [-n] [-e] -w variable=value ...
       sysctl [-n] [-e] -p <filename>	 (default /etc/sysctl.conf)
       sysctl [-n] [-e] -a
       sysctl [-n] [-e] -A

DESCRIPTION

       sysctl is used to modify kernel parameters at runtime.  The parameters available are those listed under /proc/sys/.  Procfs is required for
       sysctl(8) support in Linux.  You can use sysctl(8) to both read and write sysctl data.

PARAMETERS

       variable
	      The name of a key to read from.  An example is kernel.ostype.  The '/' separator is also accepted in place of a '.'.

       variable=value
	      To set a key, use the form variable=value, where variable is the key and value is the value to set it to.   If  the  value  contains
	      quotes or characters which are parsed by the shell, you may need to enclose the value in double quotes.  This requires the -w param-
	      eter to use.

       -n     Use this option to disable printing of the key name when printing values.

       -e     Use this option to ignore errors about unknown keys.

       -w     Use this option when you want to change a sysctl setting.

       -p     Load in sysctl settings from the file specified or /etc/sysctl.conf if none given.

       -a     Display all values currently available.

       -A     Display all values currently available in table form.

EXAMPLES

       /sbin/sysctl -a

       /sbin/sysctl -n kernel.hostname

       /sbin/sysctl -w kernel.domainname="example.com"

       /sbin/sysctl -p /etc/sysctl.conf

FILES

       /proc/sys /etc/sysctl.conf

SEE ALSO

       sysctl.conf(5)

BUGS

       The -A parameter behaves just as -a does.

AUTHOR

       George Staikos, <staikos@0wned.org>

								    21 Sep 1999 							 SYSCTL(8)