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### Installation of isc-dhcp-server on Ubuntu 12.04 LTS
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root@instructor01:/# apt-get update
root@instructor01:/# dpkg --list | grep dhcp
ii  isc-dhcp-client                      4.1.ESV-R4-0ubuntu5.8        ISC DHCP client
ii  isc-dhcp-common                      4.1.ESV-R4-0ubuntu5.8        common files used by all the isc-dhcp* packages
ii  wide-dhcpv6-client                   20080615-11                  DHCPv6 client for automatic IPv6 hosts configuration
root@instructor01:/# apt-cache search dhcp | grep isc
isc-dhcp-client - ISC DHCP client
isc-dhcp-client-dbg - ISC DHCP client (debugging symbols)
isc-dhcp-common - common files used by all the isc-dhcp* packages
isc-dhcp-dev - API for accessing and modifying the DHCP server and client state
isc-dhcp-relay-dbg - DHCP relay daemon (debugging symbols)
isc-dhcp-server - ISC DHCP server for automatic IP address assignment
isc-dhcp-server-dbg - ISC DHCP server for automatic IP address assignment (debug)
dhcp-probe - network DHCP or BootP server discover
isc-dhcp-relay - ISC DHCP relay daemon
isc-dhcp-server-ldap - DHCP server able to use LDAP as backend
netdiscover - active/passive network address scanner using arp requests
netdiscover-dbg - active/passive network address scanner using arp requests (debug)
root@instructor01:/# apt-get install isc-dhcp-server
root@instructor01:/# chkconfig --list | grep dhcp
isc-dhcp-server           0:off  1:off  2:off  3:off  4:off  5:off  6:off
isc-dhcp-server6          0:off  1:off  2:off  3:off  4:off  5:off  6:off
wide-dhcpv6-client        0:off  1:off  2:off  3:off  4:off  5:off  6:off
root@instructor01:/# chkconfig isc-dhcp-server on
root@instructor01:/# cat /etc/dhcp
dhcp/  dhcp3/          
root@instructor01:/# vi /etc/dhcp/dhcpd.conf 
root@instructor01:/# tail -f /var/run/dhcp-server/