Posts Tagged ‘Got’

How to scan for DHCP available servers in a Network range on Linux and FreeBSD

Thursday, December 8th, 2011

GNU / Linux and FreeBSD had a nifty little program (tool) called dhcping . dhcpingsend a DHCP request to DHCP server to see if it’s up and running. dhcping is also able to send a request to DHCP servers on a whole network range and therefore it can e asily be used as a scanner to find any available DHCP servers in a network.
This makes dhcping a nmap like scanner capable to determine if dhcp servers are in a network 😉
To scan an an entire network range with dhclient and find any existing DHCP servers:

noah:~# dhcping -s 255.255.255.255 -r -v
Got answer from: 192.168.2.1
received from 192.168.2.1, expected from 255.255.255.255
no answer

In above’s output actually my Dlink wireless router returns answer to the broadcast DHCP LEASE UDP network requests of dhcping .
On a networks where there is no DHCP server available, the requests dhcping -s 255.255.255.255 -r -v returns:

noah:~# dhcping -s 255.255.255.255 -r -v
no answer

This article was inspired by a post, I’ve red by a friend (Amridikon), so thx goes to him.

 

Looser Again

Wednesday, January 31st, 2007

Got the 2 mark on Marketing Exam. Again I’m a looser. I dont’ have nor time nor desire to learn again for this exam.I think I’m not suitable for student. Today we was on a coffee with Mitko, Toto and Dido. Nothing special ordinary day.Yesterday we stayed in Mitko and was installing Gentoo Linux to his laptop. Gentoo’s grub was buggy or something,we didn’t succeeded running the kernel with GRUB, so we decided to switch to LILO. We were able to makethe maching bootable using LILO. Then there was an annying error with REAL_ROOT option. After a lot of wanderingediting of /linuxrc we found the mistake it was a mismatch in lilo a mistake we made writing in it we wrote therereal_boot instead of real_root. In the end everything worked okay. And I went home sleeping.I’m not sure where my life is going to again … I’m completely Lost in the Dark.END—–