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DHCP

DHCP. DHCP. 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

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DHCP

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  1. 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 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; } }

  4. DHCP 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

  5. NIS Server Setup NIS SERVER SETUP

  6. NIS Server Setup 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)

  7. NIS Server Setup 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

  8. NIS Server Setup 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

  9. NIS Server Setup 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

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