Any RedHat linux command equivalent to HP's ndd command

[Patrick Chim]

Hi all,

Does anyone know is there any command in Redhat linux has the same function as HP's ndd command as I want to have some network tuning on Linux.

Many thanks,
Patrick

[Sundar_7]

Might be nettune available..

Check it out

Sundar

[Kodjo Agbenu · Accepted solution]

Hello Patrick,

In Linux, using /proc filesystem is the "official" method for advanced tuning.

Tunable networking parameters are located under /proc/sys/net.

2 ways to use this :

-> You can write something like this :

echo "900" >/proc/sys/net/ipv4/tcp_keepalive_time

-> You can use the /sbin/sysctl command to do the same thing. Check the syntax of /etc/sysctl.conf, then add your parameters accordingly, and finally call "sysctl -p /etc/sysctl.conf" to apply changes.


Remark : it is not recommended to change parameters on live systems, except if you know the exact meaning of the parameters being changed.

Therefore, the best method is to set these parameters during the system boot process.

Using RedHat Linux, this has already been done for you. The script involved is /etc/rc.d/rc.sysinit, which calls sysctl with /etc/sysctl.conf.

Last thing (but not least) : there is a GTK-frontend (Powertweak) that you can use for browsing the parameters and writing them in /etc/sysctl.conf : in graphical environment, just type /sbin/sysctlconfig.

Good luck.

Kodjo

[Patrick Chim]

Hi Kodjo,

Your answer is helpful to me. But I want to know whether the unit of 900 is equal to second or not !

Thanks,
Patrick

[Kodjo Agbenu]

Hi Patrick,

Sorry for this late answer.

Actually "900" stands for "900 seconds".

To have a detailed list of tunables, if you have kernel sources installed in your system check in /usr/src/linux/Documentation/networking/ip-sysctl.txt.

Otherwise :

http://www.linuxhq.com/kernel/v2.4/doc/networking/ip-sysctl.txt.html

Good luck.

Kodjo

[Patrick Chim]

Hi Kodjo,

The URL is good for me ! Thanks for your great help !

Regards,
Patrick