我的電腦連接兩個網段(eth0:192.168.123.0/24，eth1:192.168.18.0/24)，系統中redhat 9，本文將把本機安裝成兩個網段DHCP服務器，僅作測試用……
1.下載 DHCP 3.0.3 點擊下載
2.解壓：
[root@Crazy bak]# tar zxvf dhcp-3.0.3.tar.gz
dhcp-3.0.3
dhcp-3.0.3/client
......
[root@Crazy bak]# cd dhcp-3.0.3
[root@Crazy dhcp-3.0.3]# ls
client configure dhcpctl dst LICENSE Makefile.conf minires README RELNOTES site.conf
common contrib doc includes Makefile Makefile.dist omapip relay server tests
3.安裝：
[root@Crazy dhcp-3.0.3]# ./configure
System Type: linux-2.2
......
[root@Crazy dhcp-3.0.3]# make;make install
4.編輯/etc/dhcpd.conf(需手動創建)
root@Crazy etc]# vi dhcpd.conf
#全局設置
default-lease-time 259200;
max-lease-time 518400;
option domain-name-servers 202.96.134.133,202.96.128.68;
ddns-update-style ad-hoc;
#192.168.18.0/24網段，分配IP為：192.168.18.200-192.168.18.250
subnet 192.168.18.0 netmask 255.255.255.0{
range 192.168.18.200 192.168.18.250;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.18.255;
option routers 192.168.18.1;
}
#192.168.123.0/24網段，分配IP為：192.168.123.200-192.168.123.250
subnet 192.168.123.0 netmask 255.255.255.0 {
range 192.168.123.200 192.168.123.250;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.123.255;
option routers 192.168.123.254;
}
#為網卡MAC為00:11:5B:10:24:9B分配一靜態IP：192.168.18.251,做測試用
host crazy{
hardware ethernet 00:11:5B:10:24:9B;
fixed-address 192.168.18.251;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.18.255;
option routers 192.168.18.1;
}
5.試啟動DHCP(默認啟動程序為/usr/sbin/dhcpd)
[root@Crazy sbin]# dhcpd
Internet Systems Consortium DHCP Server V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Can't open lease database /var/state/dhcp/dhcpd.leases: No such file or directory --
check for failed database rewrite attempt!
Please read the dhcpd.leases manual page if you
don't know what to do about this.
If you did not get this software from ftp.isc.org, please
get the latest from ftp.isc.org and install that before
requesting help.
If you did get this software from ftp.isc.org and have not
yet read the README, please read it before requesting help.
If you intend to request help from the [email protected]
mailing list, please read the section on the README about
submitting bug reports and requests for help.
Please do not under any circumstances send requests for
help directly to the authors of this software - please
send them to the appropriate mailing list as described in
the README file.
exiting.
#啟動出錯,根據出錯信息,Can't open lease database /var/state/dhcp/dhcpd.leases: No such file or directory --
# check for failed database rewrite attempt!,建立/var/state/dhcp/dhcpd.leases
6.調試
[root@Crazy root]# touch /var/state/dhcp/dhcpd.leases
7.再啟動DHCP
[root@Crazy sbin]# dhcpd
Internet Systems Consortium DHCP Server V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Wrote 0 leases to leases file.
Listening on LPF/eth1/00:0f:3d:81:81:23/192.168.18/24
Sending on LPF/eth1/00:0f:3d:81:81:23/192.168.18/24
Listening on LPF/eth0/00:11:2f:81:ea:28/192.168.123/24
Sending on LPF/eth0/00:11:2f:81:ea:28/192.168.123/24
Sending on Socket/fallback/fallback-net
#OK,如出現上面的信息,DHCP應該就已經正常啟動了,可以通過以下命令查看是否已啟動DHCP
[root@Crazy sbin]# netstat -utln
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:32768 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:32769 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:6000 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN
udp 0 0 0.0.0.0:32768 0.0.0.0:*
udp 0 0 0.0.0.0:517 0.0.0.0:*
udp 0 0 0.0.0.0:825 0.0.0.0:*
udp 0 0 0.0.0.0:67 0.0.0.0:*
udp 0 0 0.0.0.0:111 0.0.0.0:*
udp 0 0 0.0.0.0:631 0.0.0.0:*
#上面信息中的67就是DHCP所用端口,一切OK了
8.客戶端進行測試(均為win2k的系統,IP設為自動)
#以下是192.168.18.0/24的測試信息
Ethernet adapter 本地連接:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8139 Family PCI Fast Ethernet NIC
Physical Address. . . . . . . . . : 00-11-5B-10-24-9B
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.18.250
#注意,此時IP為192.168.18.250,是因為在/etc/dhcpd.conf中沒還沒加入最後一段
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.18.1
DHCP Server . . . . . . . . . . . : 192.168.18.168
DNS Servers . . . . . . . . . . . : 202.96.134.133
202.96.128.68
Lease Obtained. . . . . . . . . . : 2005年9月13日 15:42:39
Lease Expires . . . . . . . . . . : 2005年9月16日 15:42:39
#以下是192.168.123.0/24的測試信息
Ethernet adapter 本地連接:
Connection-specific DNS Suffix . :