My nmap doesn't work without an ip range (and a sudo ;) ). And then I only get the networks. It should answer 192.168.1.1 (linksys) and 192.168.0.1 (belkin) Mark:~$ sudo nmap -sT -sU -P0 -p 67-68 -oN dhcp-scan-results 192.168.0-3.* Starting nmap V. 3.00 ( www.insecure.org/nmap/ ) Interesting ports on (192.168.0.0): Port State Service 67/tcp filtered dhcpserver 67/udp open dhcpserver 68/tcp filtered dhcpclient 68/udp open dhcpclient Interesting ports on (192.168.0.1): Port State Service 67/tcp filtered dhcpserver 67/udp open dhcpserver 68/tcp filtered dhcpclient 68/udp open dhcpclient ... and so on with 2,3,4,5,6,7,8...19,20... Maybe I should let it go on? On Oct 13, 2004, at 8:51 AM, John T. Hoffoss wrote: > nmap -sT -sU -P0 -p 67-68 -oN dhcp-scan-results > > On Tue, 12 Oct 2004 20:06:12 -0500, Mike Tuller > <mtuller at ce.anoka.k12.mn.us> wrote: >> I have a problem where there is a rouge DHCP server running on our >> network, >> and every once in a while, a system will grab an IP from it. Is there >> a >> simple way to search the network to see what servers are running as a >> DHCP >> server? >> >> Mike Tuller _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota Help beta test TCLUG's potential new home: http://plone.mn-linux.org Got pictures for TCLUG? Beta test http://plone.mn-linux.org/gallery tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list