ISC DHCP

"ISC's DHCP software is the most widely used open source DHCP implementation on the Internet. The same software can be used for LAN too. It is a carrier and enterprise grade solution to your host configuration needs." - nixCraft

Se även Kea DHCP.

Installation

sudo apt-get -y install isc-dhcp-server
sudo sed -i -r 's/INTERFACES=""/INTERFACES="eth0"/g' /etc/default/isc-dhcp-server

Konfiguration

sudo dd of=/etc/dhcp/dhcpd.conf << EOF
# Uppsatt av:

# You must prevent the DHCP server from receiving DNS information 
# from clients, set the following global option (this is a security feature):
ddns-update-style none;

# You need to set your domain name and name server:
option domain-name "exempel.se";
option domain-name-servers 8.8.8.8, 208.67.222.222;

# Increase the lease time. The time is set in seconds:
default-lease-time 7200;
max-lease-time 14400;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
# The authoritative directive indicate that the DHCP server 
# should send DHCPNAK messages to misconfigured clients. 
# If this is not done, clients will be unable to get a correct 
# IP address after changing subnets until their old lease has 
# expired, which could take quite a long time.
authoritative;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;

# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.
subnet 10.0.100.0 netmask 255.255.255.0 {
}

#Ranges
 
subnet 10.0.1.0 netmask 255.255.255.0 {
       range 10.0.1.100 10.0.1.200;
       option subnet-mask 255.255.255.0;
       option broadcast-address 10.0.1.255;
       option routers 10.0.1.1;
}

subnet 10.0.2.0 netmask 255.255.255.0 {
       range 10.0.2.100 10.0.2.200;
       option subnet-mask 255.255.255.0;
       option broadcast-address 10.0.2.255;
       option routers 10.0.2.1;
}

## Slut
EOF

Testa

sudo dhcpd -t /etc/dhcp/dhcpd.conf