How to switch setup from fixed IP to receive dynamic IP from DHCP server (and vice versa)?

How can I detect if the current Linux system has an assigned, fixed, static IP
or if it receives at bootup always a new dynamic IP from the in-house-LAN DHCP-server?

How can I change the setup from static to dynamic IP assignment (Resp. the other way)?

Matthew

On 01 Jun 2008 06:39:26 GMT, Matthew Lincoln wrote:

Based on all the provided information, you might consider reading
http://www.catb.org/~esr/faqs/smart-questions.html

> How can I detect if the current Linux system has an assigned, fixed,
> static IP or if it receives at bootup always a new dynamic IP from
> the in-house-LAN DHCP-server?

Read nic's config files.

> How can I change the setup from static to dynamic IP assignment
> (Resp. the other way)?

Change nic's config file, restart interface.

Matthew Lincoln wrote:
> How can I detect if the current Linux system has an assigned, fixed, static IP
> or if it receives at bootup always a new dynamic IP from the in-house-LAN DHCP-server?
>
> How can I change the setup from static to dynamic IP assignment (Resp. the other way)?
>
> Matthew

It depends on your distribution. What is it?

Robert

On Jun 1, 11:39 am, kmlincoln...@hotmail.com (Matthew Lincoln) wrote:
> How can I detect if the current Linux system has an assigned, fixed, static IP
> or if it receives at bootup always a new dynamic IP from the in-house-LAN DHCP-server?

===check the network configuration file, that should be under /etc/
sysconfig/network-scripts/ for rpm redhat based distro and ...
under /etc/network/ for debian based distro

> How can I change the setup from static to dynamic IP assignment (Resp. the other way)?
>
> Matthew
=== remove the static IP address info lines from teh file and then
add the dhcp lines

For ubuntu only add the line below.

iface eth0 inet dhcp

Matthew Lincoln wrote:
> How can I detect if the current Linux system has an assigned, fixed, static IP
> or if it receives at bootup always a new dynamic IP from the in-house-LAN DHCP-server?
>
> How can I change the setup from static to dynamic IP assignment (Resp. the other way)?
>
> Matthew

pgrep -l dhc
if this returns anything ... you're probably using
a dynamic ip.

Matthew Lincoln staggered into the Black Sun and said:
> How can I detect if the current Linux system has a static IP or a
> dynamic IP?

One of "pgrep dhcpcd", "pgrep pump", or "pgrep dhclient" should return a
PID if any of the major DHCP clients are running.

> How can I change the setup from static to dynamic IP assignment [and
> vice versa]?

Distro-dependent. Which distro are you using? Edit /etc/conf.d/net for
Gentoo, /etc/sysconfig/network-scripts/ifcfg-ethN for Redhat-derived
distros, and /etc/network/interfaces for Debian-derived distros.

--
I think I'll have to put on 500 pounds of subwoofers, amps, and other
delicious herbs. --MegaHAL, trained on ASR
My blog and resume: http://crow202.dyndns.org:8080/wordpress/
Matt G|There is no Darkness in Eternity/But only Light too dim for us to see

["Followup-To:" header set to comp.unix.questions.]
On 2008-06-01, Matthew Lincoln <(E-Mail Removed)> wrote:
>
>
> How can I detect if the current Linux system has an assigned, fixed,
> static IP or if it receives at bootup always a new dynamic IP from the
> in-house-LAN DHCP-server?
>
> How can I change the setup from static to dynamic IP assignment (Resp.
> the other way)?
>
> Matthew

For a Debian-based system, edit /etc/network/interfaces or use the GUI.
For an rpm-based system, look in /etc/sysconfig or use the GUI.
For Slackware or others, I don't know, maybe look for "DHCP" in
/var/log/syslog.

Matthew Lincoln wrote:

> How can I detect if the current Linux system has an assigned, fixed,
> static IP
> or if it receives at bootup always a new dynamic IP from the in-house-LAN
> DHCP-server?
>
> How can I change the setup from static to dynamic IP assignment (Resp. the
> other way)?
>
> Matthew
>
There was a time when I always seemed to get the same IP address, but my ISP
confirmed that it was dynamically assigned, i.e. simply chance. If I
wanted a fixed IP address, I had to pay extra.

Doug.