Webmin test remote DHCP sever status

Webmin, remote DHCP monitoring

 nmap -sU -p 67-68 10.0.0.2 -Pn | grep open | wc -l | grep 2

Як це працює ?

Starting Nmap 5.61TEST5 ( http://nmap.org ) at 2014-12-05 01:05 EET
Nmap scan report for server (10.0.0.2)
Host is up.
rDNS record for 10.0.0.2: server
PORT   STATE         SERVICE
67/udp open|filtered dhcps
68/udp open|filtered dhcpc