dhcpd.conf in ubuntu server

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networkDhcp (dynamic host configuration protocol) is very important to be set in the server computer. Without it, no client will be easy connect into the network. Dhcp gives internet protocol (ip) to each client. Then all the computer can communicate easily. Dhcp gives ip like some serial number that can determine what kind of network the server is provided. In this case I just want to assume that we all in a small network of class c.
The client should not set the ip by himself. Just set it to dynamic cause the server will give it one.
Ok so let’s take a look to the standar configuration that dhcp should have. In Ubuntu server like mine, dhcp will be easily installed by typing
#sudo apt-get install dhcp3-server
And everything will be downloaded and to be set.
Now change the /etc/dhcpd/dhcpd.conf so it will meet our requirement.
#sudo nano /etc/dhcpd/dhcpd.conf (source)

# dhcpd.conf # # Sample configuration file for ISC dhcpd #

# option definitions common to all supported networks… option
domain-name “example.org”; option domain-name-servers ns1.exam-
ple.org, ns2.example.org;

default-lease-time 600; max-lease-time 7200;

# If this DHCP server is the official DHCP server for the local #
network, the authoritative directive should be uncommented. #au-
thoritative;

# 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 10.152.187.0 netmask 255.255.255.0 { }

# This is a very basic subnet declaration.

subnet 10.254.239.0 netmask 255.255.255.224 {
range 10.254.239.10 10.254.239.20;
option routers rtr-239-0-1.example.org, rtr-239-0-2.exam-
ple.org; }

# This declaration allows BOOTP clients to get dynamic addresses,
# which we don’t really recommend.

subnet 10.254.239.32 netmask 255.255.255.224 {
range dynamic-bootp 10.254.239.40 10.254.239.60;
option broadcast-address 10.254.239.31;
option routers rtr-239-32-1.example.org; }

# A slightly different configuration for an internal subnet.
subnet 10.5.5.0 netmask 255.255.255.224 {
range 10.5.5.26 10.5.5.30;
option domain-name-servers ns1.internal.example.org;
option domain-name “internal.example.org”;
option routers 10.5.5.1;
option broadcast-address 10.5.5.31;
default-lease-time 600;
max-lease-time 7200; }

# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-spe-cific information
# will still come from the host declaration.

host passacaglia {
hardware ethernet 0:0:c0:5d:bd:95;
filename “vmunix.passacaglia”;
server-name “toccata.fugue.com”; }

# Fixed IP addresses can also be specified for hosts. These ad-
dresses # should not also be listed as being available for dynam-
ic assignment. # Hosts for which fixed IP addresses have been
specified can boot using # BOOTP or DHCP. Hosts for which no
fixed address is specified can only # be booted with DHCP, unless
there is an address range on the subnet # to which a BOOTP client
is connected which has the dynamic-bootp flag # set. host fanta-
sia {
hardware ethernet 08:00:07:26:c0:a5;
fixed-address fantasia.fugue.com; }

# You can declare a class of clients and then do address alloca-tion
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.

class “foo” {
match if substring (option vendor-class-identifier, 0, 4) =
“SUNW”; }

shared-network 224-29 {
subnet 10.17.224.0 netmask 255.255.255.0 {
option routers rtr-224.example.org;
}
subnet 10.0.29.0 netmask 255.255.255.0 {
option routers rtr-29.example.org;
}
pool {
allow members of “foo”;
range 10.17.224.10 10.17.224.250;
}
}

Make a necessary change to it. Like the network address, it netmask and a static ip given to a specific client.

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