Check config errors: 
	dhcpd -cf /etc/dhcp/dhcpd.conf

To make a host request a new DHCP lease, execute:
	dhclient -r
	dhclient







DORA Interaction





Capturing DHCP/BOOTP traffic

A captured (tcpdump) DORA Interaction:
Jun 16 07:37:16 www dhcpd[544523]: DHCPDISCOVER from ec:71:db:07:ca:1b via
eth0
Jun 16 07:37:17 www dhcpd[544523]: DHCPOFFER on 192.168.0.143 to
ec:71:db:07:ca:1b via eth0
Jun 16 07:37:20 www dhcpd[544523]: DHCPREQUEST for 192.168.0.143
(192.168.0.4) from ec:71:db:07:ca:1b via eth0
Jun 16 07:37:20 www dhcpd[544523]: DHCPACK on 192.168.0.143 to
ec:71:db:07:ca:1b via eth0

tcpdump -i eth0 -nnn "udp port 67 or udp port 68"
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
11:23:54.378332 IP 192.168.0.100.68 > 192.168.0.5.67: BOOTP/DHCP, Request
from b8:2c:a0:0c:d6:1e, length 548
11:23:54.382661 IP 192.168.0.5.67 > 192.168.0.100.68: BOOTP/DHCP, Reply,
length 300
11:26:42.969497 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
8c:49:62:02:c6:97, length 548