为内网提供dhcp服务,每个网卡一个网段；
平台：
FreeBSD 5.1 + ports
#程序安装
cd /data/usr/ports/net/isc-dhcp3
make clean install clean
###配置
#/usr/local/etc/dhcpd.conf.sample 是个很好的参考文件；
###########
#注意：一下配置的多个网段，分别对应服务器上多个网卡的地址段，而不是单一网卡上的多个地址（address alias 地址别名）；
#如果你有某网卡设置多个地址，而配置文件中分别给这些网段设置了subnet（这是很多人所谓的”多网段dhcp地址分配“），那么启动
#dhcpd时，会收到如下错误,一般是发送到/var/log/messages：
#Jun 19 14:49:14 mail dhcpd: Interface fxp1 matches multiple shared networks
#
##############
#vi /usr/local/etc/dhcpd.conf
#begin of dhcpd.conf
# dhcpd.conf
server-identifIEr mail.oss4e.org;
option domain-name "oss4e.org";
option domain-name-servers 202.96.134.133;
default-lease-time 600;
max-lease-time 7200;
#重要，没有这一行不能启动dhcpd。
ddns-update-style none;
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
authoritative;
# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;
# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.
# Fixed IP addresses can also be specified for hosts. These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP. Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
#host fantasia {
# hardware ethernet 08:00:07:26:c0:a5;
# fixed-address fantasia.fugue.com;
#}
#group优先于subnet。
group {
# PXE-specific configuration directives...
#next-server 172.16.100.249;
#filename "/pxeLinux.0";
# You need an entry like this for every host
# unless you're using dynamic addresses
host temp {
hardware ethernet 00:08:c7:08:68:2b;
#172.16.100.189 - 172.16.100.199
fixed-address 172.16.100.189;
option host-name "temp.oss4e.org";
next-server 172.16.230.254;
filename "/pxelinux.0";
}
}
#可以为不同的网段分配ip；
#subnet 172.16.100.0 netmask 255.255.255.0 {
# server-identifier 172.16.100.245;
# range dynamic-bootp 172.16.100.139 172.16.100.187;
# option domain-name-servers 172.16.100.254;
# option domain-name "oss4e.org";
# option routers 172.16.100.254;
# option broadcast-address 172.16.100.255;
# default-lease-time 6000;
# max-lease-time 72000;
# allow booting;
# allow bootp;
# next-server 172.16.100.245;
# filename "/pxelinux.0";
#}
subnet 172.16.250.0 netmask 255.255.255.0 {
server-identifier 172.16.250.254;
range dynamic-bootp 172.16.250.139 172.16.250.187;
option domain-name-servers 172.16.250.254;
option domain-name "oss4e.org";
option routers 172.16.250.254;
option broadcast-address 172.16.250.255;
default-lease-time 6000;
max-lease-time 72000;
allow booting;
allow bootp;
next-server 172.16.250.254;
filename "/pxelinux.0";
}
###
subnet 172.16.230.0 netmask 255.255.255.0 {
server-identifier 172.16.230.254;
range dynamic-bootp 172.16.230.139 172.16.230.187;
option domain-name-servers 172.16.230.254;
option domain-name "oss4e.org";
option routers 172.16.230.254;
option broadcast-address 172.16.230.255;
default-lease-time 6000;
max-lease-time 72000;
allow booting;
allow bootp;
next-server 172.16.230.254;
filename "/pxelinux.0";
}
#subnet 192.168.0.0 netmask 255.255.255.0 {
# server-identifier 192.168.0.254;
# range dynamic-bootp 192.168.0.139 192.168.0.187;
# option domain-name-servers 192.168.0.254;
# option domain-name "websofts.com";
# option routers 192.168.0.254;
# option broadcast-address 192.168.0.255;
# default-lease-time 6000;
# max-lease-time 72000;
# #allow booting;
# #allow bootp;
# #next-server 192.168.0.254;
# #filename "/pxelinux.0";
#}
#end of dhcpd.conf
cp -p /usr/local/etc/rc.d/isc-dhcpd.sh.sample /usr/local/etc/rc.d/isc-dhcpd.sh
###end
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