centos 6.5 - dhcp and nat server

install dhcp server:
	yum install dhcp

select nic for the dhcp:
	nano /etc/sysconfig/dhcpd
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DHCPDARGS=eth1
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copy sample config file:
	cp /usr/share/doc/dhcp-4.1.1/dhcpd.conf.sample /etc/dhcp/dhcpd.conf

configure dhcp scope:
	nano /etc/dhcp/dhcpd.conf
----------------------------------------------------------------------
option domain-name “domain.local”;
option domain-name-servers 8.8.8.8, 8.8.4.4;

default-lease-time 600;
max-lease-time 7200;

log-facility local7;

subnet 192.168.0.0 netmask 255.255.255.0 {
	range 192.168.0.100 192.168.0.150;
	option domain-name-servers 8.8.8.8;
	option routers 192.168.0.1;
}
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start dhcp:
	/etc/init.d/dhcpd start


enable ip forwarding:
	echo 1 > /proc/sys/net/ipv4/ip_forward

	nano /etc/sysctl.conf
---------------------------------------------
net.ipv4.ip_forward = 1
---------------------------------------------

configure iptables:
	iptables -I FORWARD 1 -i eth1 -o eth0 -j ACCEPT
	iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
	service iptables save