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1、linux 网络服务 dhcp 刘世阳- 1 -使用虚拟机，拓扑图如下服务器设置1.首先配置 DHCP 服务器 ip 地址必须是静态 IP 我设置的是 192.168.0.2 设置好后重启服务rootlocalhost # vi /etc/sysconfig/network-scripts/ifcfg-eth0rootlocalhost # service network restart正在关闭接口 eth0： 确定关闭环回接口： 确定弹出环回接口： 2.用 yum 安装 dhcpyum install dhcp * 安装所有与 dhcp 相关的组件避免后面出错3.找到配置文件并编辑rpm q
2、l dhcp rootlocalhost init.d# rpm -ql dhcp/etc/dhcpd.conf/etc/rc.d/init.d/dhcpd/etc/rc.d/init.d/dhcrelay/etc/sysconfig/dhcpdlinux 网络服务 dhcp 刘世阳- 2 -/etc/sysconfig/dhcrelay/usr/bin/omshell/usr/sbin/dhcpd/usr/sbin/dhcrelay/usr/share/doc/dhcp-3.0.5/usr/share/doc/dhcp-3.0.5/IANA-arp-parameters/usr/share/
3、doc/dhcp-3.0.5/README/usr/share/doc/dhcp-3.0.5/RELNOTES/usr/share/doc/dhcp-3.0.5/api+protocol/usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample黄色的部分就是示例配置文件，将该文件复制到/etc 下 修该其中的参数来配置你的服务器rootlocalhost # cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.confcp：是否覆盖“/etc/dhcpd.conf”? yrootlocalhost #
4、vi /etc/dhcpd.conf1 ddns-update-style interim;2 ignore client-updates;3 4 subnet 192.168.0.0 netmask 255.255.255.0 5 6 # - default gateway7 option routers 192.168.0.1;8 option subnet-mask 255.255.255.0;9 10 option nis-domain domain.org;11 option domain-name asus;linux 网络服务 dhcp 刘世阳- 3 -12 option dom
5、ain-name-servers 192.168.0.2;13 14 option time-offset -18000; # Eastern Standard Time15 # option ntp-servers 192.168.1.1;16 # option netbios-name-servers 192.168.0.1;17 # - Selects point-to-point node (default is hybrid). Dont change this unless18 # - you understand Netbios very well19 # option netb
6、ios-node-type 2;20 21 range dynamic-bootp 192.168.0.128 192.168.0.254;22 default-lease-time 21600;23 max-lease-time 43200;24 25 # we want the nameserver to appear at a fixed address26 host linux 27 next-server ;28 hardware ethernet 12:34:56:78:AB:CD;29 fixed-address 207.175.42.254;30 31 32 33 subnet
7、 192.168.1.0 netmask 255.255.255.0 34 35 # - default gateway36 option routers 192.168.1.1;37 option subnet-mask 255.255.255.0;38 39 option nis-domain domain.org;40 option domain-name asus;41 option domain-name-servers 192.168.0.2;42 43 option time-offset -18000; # Eastern Standard Time44 # option nt
8、p-servers 192.168.1.1;45 # option netbios-name-servers 192.168.0.1;46 # - Selects point-to-point node (default is hybrid). Dont change this unless47 # - you understand Netbios very well48 # option netbios-node-type 2;49 50 range dynamic-bootp 192.168.0.128 192.168.0.254;51 default-lease-time 21600;5
9、2 max-lease-time 43200;53 54 # we want the nameserver to appear at a fixed address55 host nextlinux linux 网络服务 dhcp 刘世阳- 4 -56 next-server marvin.con;57 hardware ethernet 12:34:56:78:AB:CE;58 fixed-address 207.175.42.254;59 60 配置好后开启服务rootlocalhost # service dhcpd start启动 dhcpd： 确定如果服务启动失败 就去看日志 cat
10、 /var/log/messages配置中继服务器1.配置两个网卡的地址 eth0（vmnat3） 、eth1（vmnat4）配置好后重启服务2.配置 DHCP 中继服务rootAsus # vi /etc/sysconfig/dhcrelayrootAsus # service dhcrelay start启动 dhcrelay： 确定3.配置 sysctl.conf 文件linux 网络服务 dhcp 刘世阳- 5 -rootAsus # vi /etc/sysctl.confnet.ipv4.ip_forward = 1 # 把配置文件该行值改为 1然后启动 rootAsus # sys
11、ctl -pnet.ipv4.ip_forward = 1net.ipv4.conf.default.rp_filter = 1net.ipv4.conf.default.accept_source_route = 0kernel.sysrq = 0kernel.core_uses_pid = 1net.ipv4.tcp_syncookies = 1kernel.msgmnb = 65536kernel.msgmax = 65536kernel.shmmax = 4294967295kernel.shmall = 268435456客户端获取 IPdhclient 如果提示 dhclient
12、已存在则 killall dhclient 然后重新获取rootasus # killall dhclientdhclient: no process killedrootasus # dhclientInternet Systems Consortium DHCP Client V3.0.5-RedHatCopyright 2004-2006 Internet Systems Consortium.All rights reserved.For info, please visit http:/www.isc.org/sw/dhcp/Listening on LPF/eth0/00:0c:2
13、9:03:2c:70Sending on LPF/eth0/00:0c:29:03:2c:70Sending on Socket/fallbackDHCPREQUEST on eth0 to 255.255.255.255 port 67DHCPREQUEST on eth0 to 255.255.255.255 port 67DHCPREQUEST on eth0 to 255.255.255.255 port 67DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14No DHCPOFFERS received.Trying recorded lease 192.168.0.254PING 192.168.0.1 (192.168.0.1) from 192.168.0.254 e
