DHCP服务#

[TOC]

IPv6初认知#

nmcli 设置IPv6 地址
- ipv6.method manual 手动分配
- 自动分配
  - SLAAC
  - DHCPv6

通信地址段： ==2001:2026::/64==

主机R11: 2001:2026::121

主机R39: 2001:2026::126

Note

IPv6 没有广播

1
'主机R11'
2
[root@R11 ~]# nmcli device  up ens161
3
Device 'ens161' successfully activated with 'f551d2f9-5a50-4960-940e-6a541cc20d83'.
4
[root@R11 ~]# nmcli connection modify ens161 ipv6.method manual ipv6.addresses 2001:2026::121/64
5
# 手动给了一个ipv6的地址！
6
[root@R11 ~]# ip a show ens161 | grep inet6
7
    inet6 fe80::4ddc:6d1:5199:2f31/64 scope link noprefixroute
8
[root@R11 ~]# nmcli con up ens161
9
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6)
10
[root@R11 ~]# ip a show ens161 | grep inet6
11
  inet6 2001:2026::121/64 scope global noprefixroute
12
    inet6 fe80::4ddc:6d1:5199:2f31/64 scope link noprefixroute
13
# 多了一个！
14
=============================
15
'主机R39'
16
[root@R39 ~]# nmcli connection modify ens224 ipv6.method manual ipv6.addresses 2001:2026::126/64
17
[root@R39 ~]# ip a sho ens224 | grep inet6
18
    inet6 fe80::c847:ebb0:d4b8:ab8c/64 scope link noprefixroute
19
[root@R39 ~]# nmcli con up ens224
20
[root@R39 ~]# ip a sho ens224 | grep inet6
21
    inet6 2001:2026::126/64 scope global noprefixroute
22
    inet6 fe80::c847:ebb0:d4b8:ab8c/64 scope link noprefixroute
23
'测试联通性！'
24
[root@R39 ~]# ping 2001:2026::121/64
25
ping: 2001:2026::121/64: Name or service not known
26
❌️是ping6
27
❌️没有/64
28
[root@R39 ~]# ping6 2001:2026::121
29
PING 2001:2026::121 (2001:2026::121) 56 data bytes
30
64 bytes from 2001:2026::121: icmp_seq=1 ttl=64 time=1.13 ms
31
64 bytes from 2001:2026::121: icmp_seq=2 ttl=64 time=0.296 ms
32
64 bytes from 2001:2026::121: icmp_seq=3 ttl=64 time=0.253 ms

dhcp服务端配置#

1
这里我们用R11,做这个dhcp服务器！！
2
'就用ens160这张网卡'
3
用桥接的ssh连接它！
4
172.31.31.164
5

6
（1）先手动固定它的IPv4的地址！
7
[root@R11 ~]# nmcli con show
8
NAME    UUID                                  TYPE      DEVICE
9
ens160  7ca842f6-eea7-3c7d-a423-4a26177e6ec0  ethernet  ens160
10
[root@R11 ~]# ip a sho ens160
11
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
12
    link/ether 00:50:56:36:5b:fb brd ff:ff:ff:ff:ff:ff
13
    altname enp3s0
14
    altname enx005056365bfb
15
    inet 10.0.0.111/24 brd 10.0.0.255 scope global noprefixroute ens160
16
       valid_lft forever preferred_lft forever
17
[root@R11 ~]# nmcli con modify ens160 ipv4.method manual ipv4.addresses 10.0.0.33/24 ipv4.gateway 10.0.0.2 connection.autoconnect yes
18
[root@R11 ~]# nmcli con up ens160
19
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/7)
20
[root@R11 ~]# ip a sho ens160
21
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
22
    link/ether 00:50:56:36:5b:fb brd ff:ff:ff:ff:ff:ff
23
    altname enp3s0
24
    altname enx005056365bfb
25
    inet 10.0.0.33/24 brd 10.0.0.255 scope global noprefixroute ens160
26
       valid_lft forever preferred_lft forever
27
[root@R11 ~]# dnf -y install kea kea-doc openssl-devel
28
Installed:
29
  kea-3.0.1-2.el10_1.x86_64    kea-doc-3.0.1-2.el10_1.noarch
30
  kea-libs-3.0.1-2.el10_1.x86_64  libpq-16.11-3.el10_1.x86_64
31
  log4cplus-2.1.1-8.el10.x86_64   mariadb-connector-c-3.4.4-1.el10.x86_64
32
  mariadb-connector-c-config-3.4.4-1.el10.noarch   openssl-devel-1:3.5.1-7.el10_1.x86_64
33
Complete!
34
[root@R11 ~]# mv /etc/kea/kea-dhcp4.conf /etc/kea/kea-dhcp.conf.back
35
[root@R11 ~]# vim /etc/kea/kea-dhcp4.conf

1
{
2
  "Dhcp4": {
3
    "interfaces-config": {
4
        // 网卡设备
5
      "interfaces": [
6
        "ens160"
7
      ]
8
    },
9
    "control-socket": {
10
      "socket-type": "unix",
11
      "socket-name": "kea4-ctrl-socket"
12
    },
13
    "lease-database": {
14
      "type": "memfile",
15
      "lfc-interval": 3600
16
    },
17
    "expired-leases-processing": {
18
      "reclaim-timer-wait-time": 10,
19
      "flush-reclaimed-timer-wait-time": 25,
20
      "hold-reclaimed-time": 3600,
21
      "max-reclaim-leases": 100,
22
      "max-reclaim-time": 250,
23
      "unwarned-reclaim-cycles": 5
24
    },
25
    "renew-timer": 900,
26
    "rebind-timer": 1800,
27
    "valid-lifetime": 3600,
28
    "subnet4": [
29
      {
30
        "id": 1,
31
          // 子网声明
32
        "subnet": "10.0.0.0/24",
33
          // 地址池
34
        "pools": [
35
          {
36
              // 从120开始分！
37
            "pool": "10.0.0.120 - 10.0.0.220"
38
          }
39
        ],
40
        "option-data": [
41
          {
42
              // 网关
43
            "name": "routers",
44
            "data": "10.0.0.2"
45
          },
46
          {
47
              // DNS 服务器
48
            "name": "domain-name-servers",
49
            "data": "10.0.0.2"
50
          }
51
        ],
52
        "reservations": []
53
      }
54
    ],
55
    "loggers": [
56
      {
57
        "name": "kea-dhcp4",
58
        "output-options": [
59
          {
60
            "output": "kea-dhcp4.log"
61
          }
62
        ],
63
        "severity": "INFO",
64
        "debuglevel": 0
65
      }
66
    ]
67
  }
68
}

1
[root@R11 ~]# getenforce
2
Disabled
3
[root@R11 ~]# systemctl is-active firewalld
4
inactive
5
[root@R11 ~]# systemctl start kea-dhcp4.service
6
[root@R11 ~]# systemctl status kea-dhcp4.service
7
● kea-dhcp4.service - Kea DHCPv4 Server
8
     Loaded: loaded (/usr/lib/systemd/system/kea-dhcp4.service; disabled; preset: disabled)
9
     Active: active (running)
10
[root@R11 ~]# ss -lntup | grep 67
11
udp   UNCONN 0      0          10.0.0.33:67         0.0.0.0:*    users:(("kea-dhcp4",pid=4368,fd=16))
12
=================================
13
'测试！'
14
root@R39:~# ip a
15
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
16
    link/ether 00:0c:29:32:84:40 brd ff:ff:ff:ff:ff:ff
17
    altname enp3s0
18
    altname enx000c29328440
19
    inet 10.0.0.34/24 brd 10.0.0.255 scope global dynamic
20

21
✅️'10.0.0.34.。。。'

绑定mac地址#

1
（1）客户端手动添加一张网卡！！
2
# 我这张是ens256（得是NAT模式的）
3
[root@R39 ~]# ip a
4
4: ens256: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
5
    link/ether 00:0c:29:32:84:54 brd ff:ff:ff:ff:ff:ff
6
    altname enp27s0
7
    altname enx000c29328454
8
# 找到它的Mac地址！00:0c:29:32:84:54
9

10
（2）来到服务端
11
1)修改配置文件
12
[root@R11 ~]# vim /etc/kea/kea-dhcp4.conf

1
{
2
              // DNS 服务器
3
            "name": "domain-name-servers",
4
            "data": "10.0.0.2"
5
          }
6
        ],
7
        "reservations": [
8
          // 绑定MAC地址
9
          // 给固定的MAC,分配固定的IP地址
10
  {
11
    "hw-address": "00:0c:29:32:84:54",
12
      // 客户端刚添加网卡的MAC地址
13
    "ip-address": "10.0.0.124"
14
          // 想要给客户端的IP地址
15
  }
16
        ]
17
      }
18
    ],
19
    "loggers": [

1
[root@R11 ~]# systemctl restart kea-dhcp4.service
2
[root@R11 ~]# systemctl is-active kea-dhcp4
3
active
4
[root@R11 ~]# ss -lntup | grep dhcp
5
udp   UNCONN 0      0         10.0.0.111:67        0.0.0.0:*    users:(("kea-dhcp4",pid=3637,fd=16))
6

7
"来到客户端！！"
8
[root@R39 ~]# nmcli device up ens256
9
Device 'ens256' successfully activated with '5138d01c-89cd-433c-97eb-4a0c3059a626'.
10
# 把网卡启动了
11
[root@R39 ~]# ip a sh ens256
12
4: ens256: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
13
    link/ether 00:0c:29:32:84:54 brd ff:ff:ff:ff:ff:ff
14
    altname enp27s0
15
    altname enx000c29328454
16
    inet 10.0.0.124/24 brd 10.0.0.255 scope global dynamic noprefixroute ens256
17
       valid_lft 3593sec preferred_lft 3593sec
18
    inet6 fe80::b120:f845:9023:f80e/64 scope link noprefixroute
19
       valid_lft forever preferred_lft forever
20
# 现在这里面就是我们刚刚给的IP地址！

实验练习#

扩展KEA-DHCP4选项支持#

1
# 扩展NTP 服务器 / DNS 域
2
[root@R11 ~]# systemctl status kea-dhcp4
3
● kea-dhcp4.service - Kea DHCPv4 Server
4
     Loaded: loaded (/usr/lib/systemd/system/kea-dhcp4.service; enabled; preset: disabled)
5
     Active: active (running)
6
[root@R11 ~]# vim /etc/kea/kea-dhcp4.conf
7
{
8
  "Dhcp4": {
9
    "interfaces-config": {
10
        // 网卡设备
11
      "interfaces": [
12
        "eth0"
13
      ]
14
    },
15
    "control-socket": {
16
      "socket-type": "unix",
17
      "socket-name": "kea4-ctrl-socket"
18
    },
19
    "lease-database": {
20
      "type": "memfile",
21
      "lfc-interval": 3600
22
    },
23
    "expired-leases-processing": {
24
      "reclaim-timer-wait-time": 10,
25
      "flush-reclaimed-timer-wait-time": 25,
26
      "hold-reclaimed-time": 3600,
27
      "max-reclaim-leases": 100,
28
      "max-reclaim-time": 250,
29
      "unwarned-reclaim-cycles": 5
30
    },
31
    "renew-timer": 900,
32
    "rebind-timer": 1800,
33
    "valid-lifetime": 3600,
34
    "subnet4": [
35
      {
36
        "id": 1,
37
          // 子网声明
38
        "subnet": "10.0.0.0/24",
39
          // 地址池
40
        "pools": [
41
          {
42
              // 从120开始分！
43
            "pool": "10.0.0.120 - 10.0.0.220"
44
          }
45
        ],
46
        "option-data": [
47
          {
48
              // 网关
49
            "name": "routers",
50
            "data": "10.0.0.2"
51
          },
52
          {
53
              // DNS 搜索域
54
            "name": "domain-search",
55
            "data": "class-server.lab"
56
             // ✅️添加搜索域
57
          },
58
          {
59
                // NTP 服务器
60
            "name": "ntp-servers",
61
            "data": "210.72.145.44, 202.120.2.101"
62
              // ✅️添加NTP服务器
63
          },
64
          {
65
              // DNS 服务器
66
            "name": "domain-name-servers",
67
            "data": "10.0.0.2, 223.6.6.6"
68
          }
69
        ],
70
        "reservations": []
71
      }
72
    ],
73
    "loggers": [
74
      {
75
        "name": "kea-dhcp4",
76
        "output-options": [
77
          {
78
            "output": "kea-dhcp4.log"
79
          }
80
        ],
81
        "severity": "INFO",
82
        "debuglevel": 0
83
      }
84
    ]
85
  }
86
}
87
[root@R11 ~]# systemctl restart kea-dhcp4

1
'客户端验证：'
2
[root@R39 ~]# cat /etc/resolv.conf
3
# Generated by NetworkManager
4
nameserver 10.0.0.2
5
[root@R39 ~]# cat /run/chrony-dhcp/eth2.sources
6
cat: /run/chrony-dhcp/eth2.sources: No such file or directory
7
====================================
8
# 上面是没有重启服务之前!
9
[root@R39 ~]# nmcli connection up  eth2
10
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/14)
11
[root@R39 ~]# cat /etc/resolv.conf
12
# Generated by NetworkManager
13
search class-server.lab
14
nameserver 10.0.0.2
15
nameserver 223.6.6.6
16
[root@R39 ~]# cat /run/chrony-dhcp/eth2.sources
17
server 210.72.145.44 iburst
18
server 202.120.2.101 iburst
19
[root@R39 ~]# chronyc sources -V
20
MS Name/IP address   Stratum Poll Reach LastRx Last sampl
21
==========================================
22
^- ntp7.flashdance.cx
23
^- a.chl.la
24
^- 119.28.183.184
25
^* 211.159.153.122
26
^- 202.120.2.101.dns.sjtu.e>
27
^? 210.72.145.44

SLAAC 自动生成地址#

1
'dhcp-server  ---> router'
2
[root@R11 ~]# dnf -y install radvd
3
Installed:
4
  radvd-2.19-16.el10.x86_64
5
Complete!
6
[root@R11 ~]# vim /etc/radvd.conf
7
'G跳到文章最后！'
8
# 文件最后新增配置即可
9
interface eth0
10
{
11
        # 启用路由通知,持续发送包括网络前缀【网络ID】报文
12
        AdvSendAdvert on;
13
        # 路由通知报文的发送最小间隔
14
        MinRtrAdvInterval 30;
15
        MaxRtrAdvInterval 100;
16
        # 路由通知报文的发送最大间隔
17
        # 实际间隔为30~100 之间的随机值
18
        # 前缀 接口ID 使用ipv6地址生成算法自动生成
19
        prefix 2001:2026:1::/64
20
        {
21
                # 前缀可用
22
                AdvOnLink on;
23
                # 允许自动生成地址
24
                AdvAutonomous on;
25
                # 不发送接口地址
26
                AdvRouterAddr off;
27
        };
28

29
};
30
[root@R11 ~]# systemctl enable --now radvd
31
Created symlink '/etc/systemd/system/multi-user.target.wants/radvd.service' → '/usr/lib/systemd/system/radvd.service'.
32
[root@R11 ~]# systemctl is-active radvd.service
33
active
34
[root@R11 ~]# systemctl is-enabled radvd.service
35
enabled

1
'client 默认地址自动配置'
2
[root@R102 ~]# ip a show eth2
3
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
4
    link/ether 00:0c:29:83:1f:2f brd ff:ff:ff:ff:ff:ff
5
    altname enp27s0
6
    altname ens256
7
    altname enx000c29831f2f
8
    inet 10.0.0.120/24 brd 10.0.0.255 scope global dynamic noprefixroute eth2
9
       valid_lft 3126sec preferred_lft 3126sec
10
    inet6 2001:2026:1:0:4de6:20a6:abff:fb1c/64 scope global dynamic noprefixroute
11
       valid_lft 86360sec preferred_lft 14360sec
12
    inet6 fe80::2510:db2b:f0a9:a589/64 scope link noprefixroute
13
       valid_lft forever preferred_lft forever
14
==========================================
15
'抓包验证！'
16
[root@R102 ~]# tcpdump -nnvvi eth2  icmp6
17
dropped privs to tcpdump
18
tcpdump: listening on eth2, link-type EN10MB (Ethernet), snapshot length 262144 bytes
19
23:14:53.078320 IP6 (flowlabel 0xba277, hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::20c:29ff:fee9:26a2 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
20
  hop limit 64, Flags [none], pref medium, router lifetime 300s, reachable time 0ms, retrans timer 0ms
21
    prefix info option (3), length 32 (4): 2001:2026:1::/64, Flags [onlink, auto], valid time 86400s, pref. time 14400s
22
      0x0000:  40c0 0001 5180 0000 3840 0000 0000 2001
23
      0x0010:  2026 0001 0000 0000 0000 0000 0000
24
    source link-address option (1), length 8 (1): 00:0c:29:e9:26:a2
25
      0x0000:  000c 29e9 26a2
26
23:15:05.214971 IP6 (flowlabel 0xba277, hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::20c:29ff:fee9:26a2 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
27
  hop limit 64, Flags [none], pref medium, router lifetime 0s, reachable time 0ms, retrans timer 0ms
28
    prefix info option (3), length 32 (4): 2001:2026:1::/64, Flags [onlink, auto], valid time 86400s, pref. time 14400s
29
      0x0000:  40c0 0001 5180 0000 3840 0000 0000 2001
30
      0x0010:  2026 0001 0000 0000 0000 0000 0000
31
    source link-address option (1), length 8 (1): 00:0c:29:e9:26:a2
32
      0x0000:  000c 29e9 26a2
33
==========================================
34
'邻居状态维护 '
35
[root@R102 ~]# ip -6 neighbo
36
fe80::20c:29ff:fee9:26a2 dev eth2 lladdr 00:0c:29:e9:26:a2 router STALE
37
fe80::20c:29ff:fee9:26a2 dev eth0 lladdr 00:0c:29:e9:26:a2 router STALE

SLAAC 自动生成地址 + DHCPv6 辅助额外参数【option】#

1
[root@R101 ~]# rpm -qa radvd
2
radvd-2.19-16.el10.x86_64
3
[root@R101 ~]# systemctl status radvd
4
● radvd.service - Router advertisement daemon for IPv6
5
     Loaded: loaded (/usr/lib/systemd/system/radvd.service; enabled; preset: disabled)
6
     Active: active (running)
7
[root@R101 ~]# vim /etc/radvd.conf
8
....
9
prefix 2001:2026:1::/64
10
        {
11
                # 前缀可用
12
                AdvOnLink on;
13
                # 允许自动生成地址
14
                AdvAutonomous on;
15
                # 不发送接口地址
16
                AdvRouterAddr off;
17
        };
18
# 原有配置无需修改,新增以下内容
19
        # 不用从DHCPv6服务器获取地址
20
        AdvManagedFlag off;
21
        # 从DHCPv6服务器获取额外参数
22
        AdvOtherConfigFlag on;
23
};
24
[root@R101 ~]# systemctl restart radvd.service
25

26
================================================
27
[root@R101 ~]# mv  /etc/kea/kea-dhcp6.conf  /etc/kea/kea-dhcp6.conf.bak
28
[root@R101 ~]# vim /etc/kea/kea-dhcp6.conf
29
{
30
"Dhcp6": {
31
    "interfaces-config": {
32
        "interfaces": [ "eth0" ]
33
    },
34
    "control-socket": {
35
        "socket-type": "unix",
36
        "socket-name": "kea6-ctrl-socket"
37
    },
38
    "lease-database": {
39
        "type": "memfile",
40
        "lfc-interval": 3600
41
    },
42
    "expired-leases-processing": {
43
        "reclaim-timer-wait-time": 10,
44
        "flush-reclaimed-timer-wait-time": 25,
45
        "hold-reclaimed-time": 3600,
46
        "max-reclaim-leases": 100,
47
        "max-reclaim-time": 250,
48
        "unwarned-reclaim-cycles": 5
49
    },
50
    "renew-timer": 1000,
51
    "rebind-timer": 2000,
52
    "preferred-lifetime": 3000,
53
    "valid-lifetime": 4000,
54
            "option-data": [
55
                {
56
                    "name": "dns-servers",
57
                    "data": "2001:4860:4860::8888, 2400:da00::6666"
58
                },
59
                {
60
                    "name": "domain-search",
61
                    "data": "class-server.lab6"
62
                },
63
                {
64
                    "name": "sntp-servers",
65
                    "data": "2001:4860:4806:1::"
66
                }
67
            ],
68
    "subnet6": [
69
        {
70
            "id": 2,
71
            "subnet": "2001:2026:1::/64",
72
            "pools": [ { "pool": "2001:2026:1::100 - 2001:2026:1::200" } ],
73
            //"pd-pools": [
74
            //    {
75
            //        "prefix": "2001:2026:1::",
76
            //        "prefix-len": 56,
77
            //        "delegated-len": 64
78
            //    }
79
            //],
80
            "reservations": [
81
            ]
82
        }
83
    ],
84
    "loggers": [
85
    {
86
        "name": "kea-dhcp6",
87
        "output-options": [
88
            {
89
                "output": "kea-dhcp6.log"
90
            }
91
        ],
92
        "severity": "DEBUG",
93
        "debuglevel": 0
94
    }
95
  ]
96
}
97
}
98
[root@R101 ~]# systemctl enable --now kea-dhcp6
99
Created symlink '/etc/systemd/system/multi-user.target.wants/kea-dhcp6.service' → '/usr/lib/systemd/system/kea-dhcp6.service'.
100
[root@R101 ~]# systemctl restart kea-dhcp6.service
101
[root@R101 ~]# systemctl status -l  kea-dhcp6
102
● kea-dhcp6.service - Kea DHCPv6 Server
103
     Loaded: loaded (/usr/lib/systemd/system/kea-dhcp6.service; enabled; preset: disabled)
104
     Active: active (running)
105
[root@R101 ~]# ss -lntup | grep 547
106
udp   UNCONN [fe.....a2]%eth0:547 users:(("kea-dhcp6"
107
udp   UNCONN [ff02::1:2]%eth0:547  users:(("kea-dhcp6"
108
================================================
109
# 客户端验证!
110
[root@R102 ~]# nmcli connection show
111
eth0   030f5...467  ethernet  eth0
112
Wired connection 1  04f7..fde  ethernet  eth2
113
eth1  cb82b7...5e009  ethernet  eth1
114
[root@R102 ~]# nmcli con modify Wired\ connection\ 1 con-name eth2
115
[root@R102 ~]# nmcli con show | grep eth2
116
eth2  04f7..6de  ethernet  eth2
117
[root@R102 ~]# nmcli con up eth2
118
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/5)
119
[root@R102 ~]# cat /etc/resolv.conf
120
# Generated by NetworkManager
121
search class-server.lab6 class-server.lab
122
nameserver 223.6.6.6
123
nameserver 2001:4860:4860::8888
124
nameserver 2400:da00::6666
125
# NOTE: the libc resolver may not support more than 3 nameservers.
126
# The nameservers listed below may not be recognized.
127
nameserver 10.0.0.2
128
[root@R102 ~]# ls -lh /run/chrony
129
chrony/      chrony-dhcp/
130
[root@R102 ~]# cat /run/chrony-dhcp/eth2.sources
131
server 210.72.145.44 iburst
132
server 202.120.2.101 iburst
133
server 2001:4860:4806:1:: iburst

音乐

音乐

DHCP服务#

IPv6初认知#

dhcp服务端配置#

绑定mac地址#

实验练习#

扩展KEA-DHCP4选项支持#

SLAAC 自动生成地址#

SLAAC 自动生成地址 + DHCPv6 辅助额外参数【option】#

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