Dhcp in use or not for Linux machine

Linux and Unix-Like Linux
1

Hi All.

Can anyone let me know the smartest and fullprrof method of checkking whther any given linux machine is using DHCP or not?

 
# ps -ef | grep dhcp

gives output like below :

root      3251  3128  0 11:02 pts/0    00:00:00 grep dhcp

so i dont think its full proof method , please suggest

2

I'm assuming you want to know if the server is using dhcp address or not? If so, you can grep for dhclient or even you can check /etc/sysconfig/network-scripts/ifconfig-interfacename for BOOTPROTO=dhcp on Redhat.

3

There isn't a foolproof method. The question "is my network device set dhcp" doesn't make sense, because a network device doesn't have a "DHCP" setting. So the question is: "Was eth0 set to 192.168.0.107 by static settings, or did dhcp do it?"

So you have to know where a distribution gets its settings to answer that question.

4

This is a continuation of the thread:

Dhcp in use or not on Solaris machine | Unix Linux Forums | Solaris

(or moreover the thread that morphed into what this thread might have been!) As such, I'll close this one.