ifconfig

tonypap1 · 09-01-2009, 05:59 AM

Hello. Is it possible to check which network interface cards are DHCP enabled by using the 'ifconfig' command ??

Are there differences in ifconfig's output depending on which flavour/os level of Linux ?

Thanks

tredegar · 09-01-2009, 07:46 AM

Quote:

Is it possible to check which network interface cards are DHCP enabled by using the 'ifconfig' command ??

No.
You need to look at how your networking is started, and that varies between distros, and you haven't told us what yours is, so we can't tell you where to look.

Quote:

Are there differences in ifconfig's output depending on which flavour/os level of Linux ?

No. But I'm not checking 800+ distros to check for you!

Welcome to LQ!

tonypap1 · 09-01-2009, 08:55 AM

Quote:

Originally Posted by tredegar

No.
You need to look at how your networking is started, and that varies between distros, and you haven't told us what yours is, so we can't tell you where to look.

No. But I'm not checking 800+ distros to check for you!

Welcome to LQ!

I'm on Red Hat Enterprise 4. Any ideas ??

Thanks

tredegar · 09-01-2009, 09:10 AM

RHEL 4 ? That's old I think.

Anyway, see here: http://www.redhat.com/docs/manuals/e...rk-config.html

If you don't want to use the GUI then the main network configuration files seem to be:
/etc/sysconfig/network
/etc/sysconfig/network-scripts/ifcfg-eth*
/etc/hosts

If you make changes to these files (as root) you'll need to restart networking for the changes to be recognised. RH does that like this (as root):
service network restart

What are you trying to do?

tonypap1 · 09-01-2009, 10:01 AM

Quote:

Originally Posted by tredegar

RHEL 4 ? That's old I think.

Anyway, see here: http://www.redhat.com/docs/manuals/e...rk-config.html

If you don't want to use the GUI then the main network configuration files seem to be:
/etc/sysconfig/network
/etc/sysconfig/network-scripts/ifcfg-eth*
/etc/hosts

If you make changes to these files (as root) you'll need to restart networking for the changes to be recognised. RH does that like this (as root):
service network restart

What are you trying to do?

Write a script that logs onto a large number of Linux servers (varying releases/versions) and detects each NIC's configuration (ie DHCP/Static).

The logging on and running command part is easy. Just need to know any commands, files or processes that I can analyse to tell me each NIC's setting.

tredegar · 09-01-2009, 12:33 PM

Quote:

Write a script that logs onto a large number of Linux servers (varying releases/versions) and detects each NIC's configuration (ie DHCP/Static).

OK.
Now I begin to understand your Q.

But "writing a script" is going to be difficult if you have different distros and different releases. "How things are done" in linux is changing all the time, and networking with RH (and derivatives) is very different from networking with Debian (and derivatives).

Why don't you just ask your DHCP server which NICs are asking it for a lease? Those will be the ones configured to use dhcp.
Edit - there's no need to quote all my previous post, it's right there.
/Edit