centos5.6 配置 dhcp,三网卡，双lan,单wan

CentOS5.6 安装配置dhcp  

组网图：

eth0:192.168.0.11/24  (模拟外网)

eth1:192.168.200.254/24 (模拟LAN1)

eth2:172.16.100.254/24 (模拟LAN2)

搭建环境准备

iptables

dhcpd

配置文件

[root@test ~]# cat /etc/dhcpd.conf

ddns-update-style interim;

ignore client-updates;

subnet 192.168.200.0 netmask 255.255.255.0 {

# --- default gateway

       option routers                  192.168.200.254;

       option subnet-mask              255.255.255.0;

       option domain-name              "test.com";

       option domain-name-servers      60.191.244.5,8.8.8.8; #dns

       option time-offset              -18000;

       range dynamic-bootp 192.168.200.100 192.168.200.250;

       default-lease-time 21600;

       max-lease-time 43200;

}

#

subnet 172.16.100.0 netmask 255.255.255.0  {

# ---- default gateway

       option routers                  172.16.100.254;

       option subnet-mask              255.255.255.0;

       option domain-name              "test.com";

       option domain-name-servers      60.191.244.5,8.8.8.8;#dns

       option time-offset              -18000;

       range dynamic-bootp 172.16.100.100 172.16.100.200;

       default-lease-time  21600;

       max-lease-time  43200;

}

#

[root@test ~]# cat /etc/sysconfig/dhcpd

# Command line options here

DHCPDARGS="eth1 eth2"

[root@test ~]# service dhcpd restart

[root@test ~]# iptables -t nat -A POSTROUTING -s 192.168.200.0/24 -j SNAT --to-s 192.168.0.11

[root@test ~]# iptables -t nat -A POSTROUTING -s 172.16.100.0/24 -j SNAT --to-s 192.168.0.11

配置结束,局域网客户机 可以自动获取ip了