install ISC-DHCP on Ubuntu 12.10

root@ubuntu-1:~# tail -1 /etc/lsb-release DISTRIB_DESCRIPTION="Ubuntu 12.10" root@ubuntu-1:~# uname -ri 3.5.0-26-generic x86_64

install ISC-DHCP via apt-get

root@ubuntu-1:~# apt-get install -y isc-dhcp-server root@ubuntu-1:~# dhcpd --version isc-dhcpd-4.2.4

configure DHCPD

back up an original configuration file before configuring DHCPD.

root@ubuntu-1:/etc/dhcp# cd /etc/dhcp root@ubuntu-1:/etc/dhcp# cp dhcpd.conf dhcpd.conf.bakup

sample configuration is in “/usr/share/doc/isc-dhcp-server/examples/dhcpd.conf” directory.

root@ubuntu-1:/etc/dhcp# egrep -v ^# dhcpd.conf | grep -v ^$ INTERFACES="eth3"; ddns-update-style none; option domain-name "example.org"; option domain-name-servers ns1.example.org, ns2.example.org; default-lease-time 600; max-lease-time 7200; authoritative; log-facility local7; subnet 192.168.150.0 netmask 255.255.255.0 {        range 192.168.150.10 192.168.150.200;        option subnet-mask 255.255.255.0;        option broadcast-address 192.168.150.255;        option routers 192.168.150.254;        ping-check false; }

start DHCPD

root@ubuntu-1:/etc/dhcp# service isc-dhcp-server start isc-dhcp-server start/running, process 4971 root@ubuntu-1:/etc/dhcp# ps aux | grep 4971 | grep -v grep dhcpd     4971  0.0  0.0  19604  6664 ?        Ss   17:51   0:00 dhcpd -user dhcpd -group dhcpd -f -q -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf

install dhcpdump on DHCPD box to analyze DHCP packets easily.

root@ubuntu-1:/etc/dhcp# apt-get install dhcpdump

run dhcpdump on DHCPD box

root@ubuntu-1:/etc/dhcp# dhcpdump -i eth3

send DHCP request to DHCPD with dhcping box.

on dhcping box

mint-1 ~ # dhcping -v -s 192.168.150.4 Got answer from: 192.168.150.4

on DHCPD box

root@ubuntu-1:/etc/dhcp# dhcpdump -i eth3  TIME: 2013-04-17 21:10:01.252    IP: 192.168.150.5 (0:26:55::zz:zz:zz) > 192.168.150.4 (0:26:55:xx:xx:xx)    OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet)  HLEN: 6  HOPS: 0   XID: e9666e51  SECS: 0 FLAGS: 0 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION:  53 (  1) DHCP message type         3 (DHCPREQUEST) OPTION:  50 (  4) Request IP address        0.0.0.0 ---------------------------------------------------------------------------  TIME: 2013-04-17 21:10:01.252    IP: 192.168.150.4 (0:26:55:xx:xx:xx) > 255.255.255.255 (ff:ff:ff:ff:ff:ff)    OP: 2 (BOOTPREPLY) HTYPE: 1 (Ethernet)  HLEN: 6  HOPS: 0   XID: e9666e51  SECS: 0 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 192.168.150.4 GIADDR: 0.0.0.0 CHADDR: 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION:  53 (  1) DHCP message type         6 (DHCPNAK) OPTION:  54 (  4) Server identifier         192.168.150.4 ---------------------------------------------------------------------------  TIME: 2013-04-17 21:10:01.252    IP: 192.168.150.5 (0:26:55::zz:zz:zz) > 192.168.150.4 (0:26:55:xx:xx:xx)    OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet)  HLEN: 6  HOPS: 0   XID: e9666e51  SECS: 0 FLAGS: 0 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION:  53 (  1) DHCP message type         7 (DHCPRELEASE) --------------------------------------------------------------------------- ^C