DHCP prevents IP address Conflicts and helps conserve the use of client IP Address on the Network

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2 What is? It gives IP Addresses Automatically to the s who is requesting for an IP Address Centralized IP Address Management prevents IP address Conflicts and helps conserve the use of client IP Address on the Network reduces the complexity and amount of administrative work by assigning TCP/IP configuration IP configuration is updated automatically

3 Why? Static IP Assigning Dynamic IP Assigning IP addresses are entered manually IP address could be entered incorrectly Communication and network issues can result Frequent computer moves increase administrative effort IP addresses are supplied automatically Correct configuration information is ensure configuration is updated automatically A common source of network problems is eliminated

4 How Server works? Server1 53 5e7c-3a2c-1d9a Server2 54 5e7c-3a2c-1d9d Linux 5e7c-3a2c-1d9b Windows 5e7c-3a2c-1d9c

5 How Server works? broadcasts a DISCOVER packet Server1 Linux 5e7c-3a2c-1d9b 53 5e7c-3a2c-1d9a Discover From : 5e7c-3a2c-1d9b To : ffff-ffff-ffff Windows 5e7c-3a2c-1d9c Server2 54 5e7c-3a2c-1d9d

6 How Server works? Linux 5e7c-3a2c-1d9b Server broadcast a OFFER IP address Pool packet Server e7c-3a2c-1d9a Offer From : 5e7c-3a2c-1d9a To : 5e7c-3a2c-1d9b Offer IP : Windows 5e7c-3a2c-1d9c Server2 54 5e7c-3a2c-1d9d

7 How Server works? Linux 5e7c-3a2c-1d9b Server1 53 5e7c-3a2c-1d9a Offer From : 5e7c-3a2c-1d9d To : 5e7c-3a2c-1d9b Offer IP : Windows 5e7c-3a2c-1d9c Server broadcast a OFFER packet Server2 IP address Pool e7c-3a2c-1d9d 54

8 How Server works? broadcasts a REQUEST packet Server1 Linux 5e7c-3a2c-1d9b 53 5e7c-3a2c-1d9a Request From : 5e7c-3a2c-1d9b To : 5e7c-3a2c-1d9a Request for Lease of IP : Windows 5e7c-3a2c-1d9c Server2 54 5e7c-3a2c-1d9d

9 How Server works? Linux e7c-3a2c-1d9b Server broadcasts a ACK IP address Poolpacket Server Hrs e7c-3a2c-1d9a Offer From : 5e7c-3a2c-1d9a To : 5e7c-3a2c-1d9b Reply with 6 Hours Lease for IP : Windows 5e7c-3a2c-1d9c Server2 54 5e7c-3a2c-1d9d

10 How Lease Renewal works? sends a REQUEST packet Server1 Linux 53 5e7c-3a2c-1d9a Request From : 5e7c-3a2c-1d9b To : 5e7c-3a2c-1d9a Request to Extend Lease of IP : Windows Server2 54 5e7c-3a2c-1d9d % 5e7c-3a2c-1d9b 5e7c-3a2c-1d9c

11 How Lease Renewal works? Server sends a ACK IP address Poolpacket Server Hrs e7c-3a2c-1d9a Offer From : 5e7c-3a2c-1d9a To : 5e7c-3a2c-1d9b Extend Lease by 6 Hours for IP : Server2 54 5e7c-3a2c-1d9d Linux e7c-3a2c-1d9b 150% Windows 5e7c-3a2c-1d9c

12 Why Reservation? Assigning IP address dynamically has some problems that every time a client system boots it is not sure that it will get the same IP so it will be uneasy task for other systems to find the particular system. To solve the above problem we can do mac-address binding of the IP s. Just give its entry in the fixedaddress portion.

13 Requirements Packages dhcp* Port Numbers 67 Bootp 68 Configuration File /etc/dhcpd.conf Service dhcpd Daemon dhcpd

14 Server Configuration Server 53 5e7c-3a2c-1d9a Web Server 54 5e7c-3a2c-1d9d Linux 5e7c-3a2c-1d9b Windows 5e7c-3a2c-1d9c

15 Configuring Server Install the package by using one of the installation methods ~]# mount 50:/var/ftp/pub/RedHat/RPMS/ /mnt ~]# cd /mnt ~]# rpm -ivh dhcp* --force --aid Sample configuration file location /usr/share/doc/dhcp3.0.1/dhcpd.conf.sample Copying Sample file for Configuration ~]# cp /usr/share/doc/dhcp3.0.1/dhcpd.conf.sample /etc/dhcpd.conf

16 /etc/dhcpd.conf To change the range and other options default-lease-time 21600; subnet netmask { option routers 54; option subnet-mask ; option domain-name zoom.com"; option domain-name-servers 53; range ; } To bind mac-address to IP address host server2 { option host-name server2.zoom.com"; hardware ethernet 5E:7C:3A:2C:1D:9D; fixed-address 54; }

17 Server To restart the services ~]# service dhcpd restart

18 Linux Install the package by using one of the installation methods mount 50:/var/ftp/pub/RedHat /RPMS/ /mnt ~]# cd /mnt ~]# rpm -ivh dhclient* --force --aid To get IP address from server dhclient or ~]# netconfig Check the box use dynamic IP configuration

19 Windows Configuring Select My Network Places. Right click Properties. Select Local Area Connection Right click Properties. Double Click Internet Protocol (TCP/IP) Select Option Obtain an IP Address automatically