一、不指定分配地址

dnsmasq服务器

配置dnsmasq服务器ipv6地址（本测试接口为eth0）

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0TYPE=EthernetONBOOT=yesNM_CONTROLLED=noBOOTPROTO=dhcpDEFROUTE=yesIPV4_FAILURE_FATAL=yesPEERDNS=yesIPV6INIT=yesIPV6to4INIT=yesIPV6FORDING=yesIPV6ADDR=fd00::1/64

/etc/sysconfig/network

NETWORKING_IPV6=yes

设置dnsmasq.conf

read-etherslog-dhcplog-querieslog-facility=/var/log/dnsmasq.logaddn-hosts = /var/lib/cobbler/cobbler_hostsdomain=localdhcp-lease-max=1800server=/local/resolv-file=/etc/dnsmasq.upstreaminterface=eth0cache-size=1024# This is one of the key options. dnsmasq tries to move out servername# and PXE filename from special fields into DHCP options.# Some old clients can't understand those DHCP options, so they# will not be able to boot via PXE without this option enabled.# For example gPXE will not work while iPXE works fine.dhcp-no-override# for many simultaneously DHCPDISCOVVER requests dnsmasq can offer# the same IP for two differnt MAC addresses. This option prevents it# by assigning IPs one by one instead of using hash algorithm.dhcp-sequential-ip#ipv4dhcp-option=6,10.10.1.2dhcp-range=internal,10.10.1.128,10.10.1.254,255.255.255.0,120mdhcp-option=net:internal,option:router,10.10.1.2dhcp-boot=net:internal,pxelinux.0,boothost,10.10.1.2#ipv6dhcp-range=fd00::22, fd00::44, 64, 1henable-ra#domain-needed#resolv-file=/etc/resolv.dnsmasq.conf

检查语法并启动dnsmasq：dnsmasq -test

杀掉测试进程后启动dnsmasq &

dhcp租用信息：/var/lib/dnsmasq/dnsmasq.leases

客户端配置

网卡配置

客户机上的接口为eth0，网卡配置文件/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0ONBOOT=yes#禁止NetworkManager管理网卡NM_CONTROLLED=no HWADDR=#USERCTL=noPEERDNS=yesBOOTPROTO=dhcp #只能小写#BOOTPROTO=dhcp6  打开这个只会获取ipv6的地址DHCPV6C=yesIPV6INIT=yes

网络配置文件/etc/sysconfig/network

NETWORKING_IPV6=yesIPV6_AUTOCONF=yes  #yes表示自动获取地址

测试：
dhclient -6 -v eth0

二、指定分配地址

使用dnsmasq 有状态DHCPv6下发特定租约

上面的方式是dnsmasq按照特定算法给客户端分配ipv4和ipv6地址，如果想给每个客户端分配指定地址，需要增加以下配置。

dnsmasq服务器（dnsmasq.conf ）
配置和上面一样，添加以下语句
```
dhcp-host=id:00:03:01:00:08:00:27:5c:b9:f0, [fd00::22]
```
修改配置需要重启dnsmasq服务

客户端
根据官方描述，dhclient版本为4.1+支持ipv6。为了支持DUID-LL要在/etc/dhcp/dhclient.conf中写入：

ZQ send dhcp6.client-id = concat(00:03:00, hardware);
/etc/sysconfig/network-scripts/ifcfg-eth0跟上面一样
配置/etc/sysconfig/network
```
NETWORKING_IPV6=yesIPV6_AUTOCONF=no
```
客户端租约文件/var/lib/dhclient/dhclient6.leases

三、问题分析

centos7使用NetworkManager启动dhclient （NM_CONTROLLED=yes ）