The Dynamic Host Configuration Protocol(DHCP) is a standardized networking protocol used on Internet Protocol networks for dynamically distributing Ip Address automatic to Client or Host Systems. It will be Renew(Change) the Ip Address after 7 Days or 1 Week.
###Dynamic Host Configuration Protocol Daemon###
Features:
1. Provides automatic configuration of IPv4 clients
a. IPv4 address
b. Subnet mask
c. Default gateway
d. DNS Servers
e. NTP Servers
f. WINS Servers
2. Leases the addreses and related information based on predefined values:
a. 1 day
b. 1 week
c. 1 month
3. DHCP uses UDP protocol and layer-2 information to request/assign addresses
4. DHCP Process - DORA
a. Discovery - client broadcasts on the local subnet for a DHCP server
b. Offer - returned by the DHCP server
c. Request - formal address request by client
d. Acknowledgement/Acceptance - Acknowledgement occurrs
Note: DHCPD records leases in: /var/lib/dhcpd/dhcpd.leases
Tasks:
1. Install DHCP server
a. yum -y install dhcp
2. Configure: /etc/dhcpd.conf - primary config file
3. Set service up to start when system boots
a. chkconfig dhcpd on - 2345
4. Disable service on 192.168.75.100 box
a. rcdhcpd stop
5. Start service on localhost:
a. service dhcpd start
6. Setup DHCP reservation
a. Requires the MAC address of the client (00:0C:29:B5:16:92)
b. Requires the 'fixed-address' - IPv4 address to map to the MAC address
c. Optional 'option-*' are supported between host { } block
d. service dhcpd restart - restart to effect changes
/etc/dhcpd.conf
Port Numbers
67 Bootp
68 DHCP
/usr/share/doc/dhcp-<version-number>/dhcpd.conf.sample
subnet 192.168.1.0 netmask 255.255.255.0 {
# The range of IP addresses the server
# will issue to DHCP enabled PC clients
# booting up on the network
range 192.168.1.201 192.168.1.220;
# Set the amount of time in seconds that
# a client may keep the IP address
default-lease-time 86400;
max-lease-time 86400;
# Set the default gateway to be used by
# the PC clients
option routers 192.168.1.1;
# Don't forward DHCP requests from this
# NIC interface to any other NIC
# interfaces
option ip-forwarding off;
# Set the broadcast address and subnet mask
# to be used by the DHCP clients
option broadcast-address 192.168.1.255;
option subnet-mask 255.255.255.0;
# Set the DNS server to be used by the
# DHCP clients
option domain-name-servers 192.168.1.100;
# Set the NTP server to be used by the
# DHCP clients
option nntp-server 192.168.1.100;
# If you specify a WINS server for your Windows clients,
# you need to include the following option in the dhcpd.conf file:
option netbios-name-servers 192.168.1.100;
# You can also assign specific IP addresses based on the clients'
# ethernet MAC address as follows (Host's name is "laser-printer":
host laser-printer {
hardware ethernet 08:00:2b:4c:59:23;
fixed-address 192.168.1.222;
}
}
Thanking You
Hope U Like it.......
1. Provides automatic configuration of IPv4 clients
a. IPv4 address
b. Subnet mask
c. Default gateway
d. DNS Servers
e. NTP Servers
f. WINS Servers
2. Leases the addreses and related information based on predefined values:
a. 1 day
b. 1 week
c. 1 month
3. DHCP uses UDP protocol and layer-2 information to request/assign addresses
4. DHCP Process - DORA
a. Discovery - client broadcasts on the local subnet for a DHCP server
b. Offer - returned by the DHCP server
c. Request - formal address request by client
d. Acknowledgement/Acceptance - Acknowledgement occurrs
Note: DHCPD records leases in: /var/lib/dhcpd/dhcpd.leases
Tasks:
1. Install DHCP server
a. yum -y install dhcp
2. Configure: /etc/dhcpd.conf - primary config file
3. Set service up to start when system boots
a. chkconfig dhcpd on - 2345
4. Disable service on 192.168.75.100 box
a. rcdhcpd stop
5. Start service on localhost:
a. service dhcpd start
6. Setup DHCP reservation
a. Requires the MAC address of the client (00:0C:29:B5:16:92)
b. Requires the 'fixed-address' - IPv4 address to map to the MAC address
c. Optional 'option-*' are supported between host { } block
d. service dhcpd restart - restart to effect changes
/etc/dhcpd.conf
Port Numbers
67 Bootp
68 DHCP
/usr/share/doc/dhcp-<version-number>/dhcpd.conf.sample
subnet 192.168.1.0 netmask 255.255.255.0 {
# The range of IP addresses the server
# will issue to DHCP enabled PC clients
# booting up on the network
range 192.168.1.201 192.168.1.220;
# Set the amount of time in seconds that
# a client may keep the IP address
default-lease-time 86400;
max-lease-time 86400;
# Set the default gateway to be used by
# the PC clients
option routers 192.168.1.1;
# Don't forward DHCP requests from this
# NIC interface to any other NIC
# interfaces
option ip-forwarding off;
# Set the broadcast address and subnet mask
# to be used by the DHCP clients
option broadcast-address 192.168.1.255;
option subnet-mask 255.255.255.0;
# Set the DNS server to be used by the
# DHCP clients
option domain-name-servers 192.168.1.100;
# Set the NTP server to be used by the
# DHCP clients
option nntp-server 192.168.1.100;
# If you specify a WINS server for your Windows clients,
# you need to include the following option in the dhcpd.conf file:
option netbios-name-servers 192.168.1.100;
# You can also assign specific IP addresses based on the clients'
# ethernet MAC address as follows (Host's name is "laser-printer":
host laser-printer {
hardware ethernet 08:00:2b:4c:59:23;
fixed-address 192.168.1.222;
}
}
Thanking You
Hope U Like it.......
