DHCP allows clients to obtain IP addresses and other network configuration automatically from a central DHCP server. The DHCP client broadcasts a request, and the DHCP server responds with an IP address from its pool along with other parameters. The IP address can be bound to the client's MAC address.

1. DHCP DHCP

2. DHCP DHCP (Dynamic Host Configuration Protocol) is a network service that enables clients to obtain network settings (IP Address, Subnet Mask, Default Gateway, DNS Server, Hostname and Domain) automatically from a central server The DHCP client sends a broadcast request to find the DHCP server and the DHCP server in the subnet responds with an IP address (and other common network parameters) from a pool of IP addresses The IP address can be bound to the MAC address of the client Daemon: dhcpd Lease file: /var/lib/dhcp/dhcpd.leases DHCP

3. DHCP Server Configuration Configuration File: /etc/dhcpd.conf subnet 172.28.0.0 netmask 255.255.0.0 { authoritative; option routers 172.28.1.254; option subnet-mask 255.255.0.0; option domain-name "iitk.ac.in"; option domain-name-servers 172.31.1.1; range 172.28.4.2 172.28.7.254; default-lease-time 7200; max-lease-time 10800; host tc1 { hardware ethernet 00:80:64:1A:E9:14; fixed-address 172.28.120.32; } } DHCP

4. DHCP Client Configuration Configure the Network Configuration to pickup network settings from DHCP server /etc/sysconfig/network-scripts/ifcg-eth0 BOOTPROTO=dhcp (static) Applications  System Settings  Network DHCP

5. NIS SERVER SETUP NIS Server Setup

6. Network Information Service Directory Service for Centralized Authentication and Accounting The NIS server and all NIS clients are members of a NIS domain Single Master Server and Multiple Slave Servers Uses ypserv, yppasswdd and ypbind daemon (also uses portmap and rpc service) NIS Server Setup

7. NIS Server Configuration Edit File /etc/sysconfig/network and add NISDOMAIN=<mynisdomain> Build NIS maps by running /usr/lib/yp/ypinit –m (ypserv should be running) service ypserv start/stop/restart service yppasswdd start/stop/restart NIS Server Setup

8. NIS Client Configuration Specify NIS Server and NIS Domain /etc/yp.conf domain <mynisdomain> server <nis server IP> /etc/nsswitch.conf passwd: files nis shadow: files nis group: files nis /etc/sysconfig/network NISDOMAIN=<mynisdomain> service ypbind start/stop/restart NIS Server Setup

9. NIS Troubleshooting Use ypwhich to find and verify which server a client is bound to, if any Use ypcat to verify that correct NIS data is available. ypcat passwd | more NIS Server Setup