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.

1. Linux System Administration
DHCP
DHCP

2. DHCP
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

3. DHCP Server Configuration
DHCP
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;
}
}

4. 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

5. NIS Server Setup
NIS SERVER SETUP

6. 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)

7. NIS Server Configuration
NIS Server Setup
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

8. NIS Client Configuration
NIS Server Setup
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

9. 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

10. Thank you
Sreenatha Reddy K R
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