CIS 527

Lab 3 - DHCP

Special Thanks

Much of this information adapted from slides by Seth Galitzer

History

• 1982 - TCP/IP Developed
• 1985 - BOOTP Developed
• 1987 - 20,000 Hosts on Internet
• 1989 - DHC Working Group
• 1993 - DHCP Defined (RFC 1531)
• 1996 - ISC Server Released
• 1997 - DHCP Finalized (RFC 2131)
• 2003 - DHCP for IPv6 (RFC 3315)

Dynamic Host Configuration Protocol (DHCP)

• Large Networks Difficult to Manage Manually
• Computers Are Now Mobile
• Need to Automatically Configure Network Settings

Why DHCP?

• Leasing
• Renewal
• Configuration
• Portability
• Compatible with Static IP

Image Source: Fossbytes

Image Source: Seth Galitzer

Automatic Private IP Address (APIPA)

• Used when DHCP Fails
• Assigns a Link-Local IP Address
• IPv4: 169.254.0.0/16
• IPv6: fe80::/10

Sample Configuration

default-lease-time 600;  # in seconds
max-lease-time 7200;     # in seconds
authoritative;           # this server is authoritative
                         #   for this network segment
option domain-name “cis.ksu.edu”;
option domain-name-servers 129.130.254.2, 129.130.254.3;
option subnet-mask 255.255.254.0;
option broadcast-address 129.130.11.255;
option routers 129.130.10.1;
option smtp-server smtp.cis.ksu.edu;

Sample Configuration

#fixed-address
host eth0_bronco {
	option host-name "bronco";
	hardware ethernet ec:a8:6b:fe:2e:b5;
	fixed-address 129.130.10.190;
}
#dynamic pool
pool {
range 129.130.10.209 129.130.10.229;
range 129.130.10.245 129.130.10.255;
range 129.130.11.201 129.130.11.254
}