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

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

NIS Server Setup NIS SERVER SETUP

Network Information Service NIS Server Setup 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 Configuration NIS Server Setup Edit File /etc/sysconfig/network and add NISDOMAIN= 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 Client Configuration NIS Server Setup Specify NIS Server and NIS Domain /etc/yp.conf domain server /etc/nsswitch.conf passwd: files nis shadow: files nis group: files nis /etc/sysconfig/network NISDOMAIN= service ypbind start/stop/restart

NIS Troubleshooting NIS Server Setup 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