http://wiki.define-technology.com/mediawiki-1.35.0/index.php?action=history&feed=atom&title=Troubleshooting%3A_DHCP_Debugging_with_NMAP 2026-05-05T00:02:24Z Revision history for this page on the wiki MediaWiki 1.35.0 http://wiki.define-technology.com/mediawiki-1.35.0/index.php?title=Troubleshooting:_DHCP_Debugging_with_NMAP&diff=29404&oldid=prev 2019-11-12T12:49:53Z

<p>Created page with &quot;&lt;syntaxhighlight&gt; GE-Test 12:44:27 [root@p2postvpo1 ~]# vi /usr/share/nmap/scripts/broadcast-dhcp-discover.nse GE-Test 12:45:16 [root@p2postvpo1 ~]# nmap --script broadcast-dhcp-discover...&quot;</p> <p><b>New page</b></p><div>&lt;syntaxhighlight&gt;<br /> GE-Test 12:44:27 [root@p2postvpo1 ~]# vi /usr/share/nmap/scripts/broadcast-dhcp-discover.nse<br /> GE-Test 12:45:16 [root@p2postvpo1 ~]# nmap --script broadcast-dhcp-discover -e eth0 <br /> <br /> Starting Nmap 6.40 ( http://nmap.org ) at 2019-11-12 12:45 UTC<br /> Pre-scan script results:<br /> | broadcast-dhcp-discover: <br /> | IP Offered: 10.6.44.254<br /> | DHCP Message Type: DHCPOFFER<br /> | Server Identifier: 10.6.44.101<br /> | IP Address Lease Time: 0 days, 0:02:00<br /> | Renewal Time Value: 0 days, 0:01:00<br /> | Rebinding Time Value: 0 days, 0:01:45<br /> | Subnet Mask: 255.255.252.0<br /> | Broadcast Address: 10.6.47.255<br /> | Domain Name: openstacklocal<br /> | Hostname: host-10-6-44-254<br /> | Router: 10.6.44.2<br /> | Domain Name Server: 10.6.44.254<br /> |_ Interface MTU: 9000<br /> WARNING: No targets were specified, so 0 hosts scanned.<br /> Nmap done: 0 IP addresses (0 hosts up) scanned in 0.13 seconds<br /> GE-Test 12:45:19 [root@p2postvpo1 ~]# <br /> <br /> &lt;/syntaxhighlight&gt;<br /> <br /> Use the nmap script above - change the MAC address to the local interface (if DHCP service is Mac restricted) and use nmap to test the DHCP offers...</div>

David