DHCP:Dynamic HOST configuration Protol
DHCP工作模式：
申请IP地址：
client --> DHCPDISCOVER
DHCPOFFER <--server
client --> DHCPREQUEST
DHCPACK <--server
以上四个步骤是广播方式进行
续租IP地址：
client --> DHCPREQUEST
DHCPACK <--server
以上二个步骤为单播方式
DHCP relay: DHCP 中断功能
DHCP 端口：
服务端：udp/67
客户端：udp/68
配置文件：
/etc/dhcpd.conf
租约记录文件：
/var/lib/dhcpd/dhcpd.leases
dhcpd.conf
option domain-name "example.org";
option domain-name-servers ns1.example.org, ns2.example.org;
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
subnet 10.152.187.0 netmask 255.255.255.0 {
}
subnet 10.254.239.0 netmask 255.255.255.224 {
range 10.254.239.10 10.254.239.20;
option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
}
subnet 10.254.239.32 netmask 255.255.255.224 {
range dynamic-bootp 10.254.239.40 10.254.239.60;
option broadcast-address 10.254.239.31;
option routers rtr-239-32-1.example.org;
}
subnet 10.5.5.0 netmask 255.255.255.224 {
range 10.5.5.26 10.5.5.30;
option domain-name-servers ns1.internal.example.org;
option domain-name "internal.example.org";
option routers 10.5.5.1;
option broadcast-address 10.5.5.31;
default-lease-time 600;
max-lease-time 7200;
}
host passacaglia {
hardware ethernet 0:0:c0:5d:bd:95;
filename "vmunix.passacaglia";
server-name "toccata.fugue.com";
}
host fantasia {
hardware ethernet 08:00:07:26:c0:a5;
fixed-address fantasia.fugue.com;
}
class "foo" {
match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
}
shared-network 224-29 {
subnet 10.17.224.0 netmask 255.255.255.0 {
option routers rtr-224.example.org;
}
subnet 10.0.29.0 netmask 255.255.255.0 {
option routers rtr-29.example.org;
}
pool {
allow members of "foo";
range 10.17.224.10 10.17.224.250;
}
pool {
deny members of "foo";
range 10.0.29.10 10.0.29.230;
}
}dhclient 命令
-d 重新获得IP地址
DHCP （Dynamic Host Configuration Protocol)
原文：http://leozhenping.blog.51cto.com/10043183/1660946