centos下搭建dhcp服务器

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一、软件环境
CentOS release 6.5

dhcp-4.1.1-51.P1.el6.centos.x86_64
dhcp-common-4.1.1-51.P1.el6.centos.x86_64
二、网络拓扑
dhcp服务器--H3c交换机（7503）-- H3c交换机（5500）-- H3c交换机（3100）--dhcp客户端（办公电脑）
网段：
10.2.240.0/24
10.2.180.0/24
dhcp服务器ip：10.2.33.253
三、安装dhcp服务器
#yum -y install dhcp dhcp-common

#chkconfig dhcpd on
#cd /usr/share/doc/dhcp-4.1.1/
#cp dhcpd.conf.sampl /etc/dhcp/dhcpd.conf
#ifconfig
em1       Link encap:Ethernet  HWaddr F0:4D:A2:01:7E:53  
          inet addr:10.2.33.253  Bcast:10.2.33.255  Mask:255.255.255.0
          inet6 addr: fe80::f24d:a2ff:fe01:7e53/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:331357784 errors:0 dropped:0 overruns:0 frame:0
          TX packets:301154296 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:226431663072 (210.8 GiB)  TX bytes:124796979532 (116.2 GiB)

# cat /etc/sysconfig/dhcpd



# Command line options here
DHCPDARGS=em1                 

#cat /etc/dhcp/dhcpd.conf

# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#

# option definitions common to all supported networks...
option domain-name "test.com";
option domain-name-servers 202.106.196.115, 202.106.0.20;

default-lease-time 54000;                    #默认租约时间（秒）
max-lease-time 72000;                        #最大租约时间（秒）
log-facility local7;

subnet 10.2.240.0 netmask 255.255.255.0 {
  range 10.2.240.11 10.2.240.100;
  option routers 10.2.240.1;
  option broadcast-address 10.2.240.255;
}
# This is a very basic subnet declaration.

subnet 10.2.180.0 netmask 255.255.255.0 {
  range 10.2.180.101 10.2.180.150;
  option routers 10.2.180.1;
  option broadcast-address 10.2.180.255;
}
#为特定主机保留的ip地址
host fantasia {
  hardware ethernet 00:25:64:A7:39:B4;
  fixed-address 10.2.180.12;
}
#dhcp服务器网卡的网段，不加此网段，dhcp服务起不来
subnet 10.2.33.0 netmask 255.255.255.0 {                                                   
  range 10.2.33.100 10.2.33.101;
  option routers 10.2.33.1;
  option broadcast-address 10.2.33.255;
}

#service dhcpd start
#netstat -anlp |grep dhcp


udp        0      0 0.0.0.0:67                  0.0.0.0:*                               14719/dhcpd         
raw        0      0 0.0.0.0:1                   0.0.0.0:*                   7           14719/dhcpd         
unix  2      [ ]         DGRAM                    13369026 14719/dhcpd         

防火墙打开udp 67端口

四、交换机设置
登录7503交换机
[7503]dhcp relay server-group 1 ip 10.2.33.253   
[7503]interface Vlan-interface 240
[7503-Vlan-interface240]dhcp select relay
[7503-Vlan-interface240]dhcp relay server-select 1

[7503]interface Vlan-interface 180

[7503-Vlan-interface180]dhcp select relay

[7503-Vlan-interface180]dhcp relay server-select 1

登录5500交换机

[5500]dhcp relay server-group 1 ip 10.2.33.253

[5500]interface Vlan-interface 240

[5500-Vlan-interface240]dhcp select relay

[5500-Vlan-interface240]dhcp relay server-select 1

[5500]interface Vlan-interface 180

[5500-Vlan-interface180]dhcp select relay

[5500-Vlan-interface180]dhcp relay server-select 1

五、测试

修改客户端电脑ip为自动获得模式，获得ip成功。