On a mac, you can do:
ipconfig getpacket en1
look for the "server_identifier" line.
On Aug 26, 2005, at 4:16 PM, Dan Shoop wrote:
At 4:31 PM +0200 8/26/05, âern˜ Robert wrote:
use nmap to scan for dhcp port on affected network range.
Except that DHCP is not a TCP service and hence has no port that's
open ;)
We've replaced Dan's regular cup of coffee with new Folgers Crystals
with UDP support. Let's see if he notices:
# nmap -sU 10.1.240.1-2 -p 67-68
Starting nmap 3.55 ( http://www.insecure.org/nmap/ ) at 2005-08-27
12:34 EDT
Interesting ports on yyy.xxx.xxxxx.xxx (10.1.240.1):
PORT STATE SERVICE
67/udp closed dhcpserver
68/udp closed dhcpclient
MAC Address: 00:03:93:F3:25:54 (Apple Computer)
Interesting ports on xxx.xxx.xxxxx.xxx (10.1.240.2):
PORT STATE SERVICE
67/udp open dhcpserver
68/udp open dhcpclient
MAC Address: 00:0F:F3:7a:B2:14 (Cisco Systems)
Nmap run completed -- 2 IP addresses (2 hosts up) scanned in 11.863
seconds
Seems like the .1 machine isn't running a DHCP server, but the .2
machine is (which is accurate).
Tom
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