前言

本教程适用于云筏的NAT服务器，地址：https://my.cloudraft.cn/server/buy.html?lineid=1012

CentOS7

开启IPv6功能

有些镜像是禁用了IPv6功能的，因此需要开启。首先查看一下是否被禁用了：

[root@hSxavP1000044 network-scripts]# sysctl -a | grep ipv6.*disable

sysctl: reading key "net.ipv6.conf.all.stable_secret"

net.ipv6.conf.all.disable_ipv6 = 1

sysctl: net.ipv6.conf.default.disable_ipv6 = 1

reading key "net.ipv6.conf.default.stable_secret"

sysctl: reading key "net.ipv6.conf.eth0.stable_secret"

net.ipv6.conf.eth0.disable_ipv6 = 1

sysctl: reading key "net.ipv6.conf.lo.stable_secret"

net.ipv6.conf.lo.disable_ipv6 = 1

disable=1说明被禁用了，因此需要去修改，配置文件为/etc/sysctl.conf

vi /etc/sysctl.conf

#把ipv6 disable的参数都改为0，然后保存，重载服务后生效

[root@hSxavP1000044 ~]# sysctl -p

vm.swappiness = 0

net.ipv4.neigh.default.gc_stale_time = 120

net.ipv4.conf.all.rp_filter = 0

net.ipv4.conf.default.rp_filter = 0

net.ipv4.conf.default.arp_announce = 2

net.ipv4.conf.lo.arp_announce = 2

net.ipv4.conf.all.arp_announce = 2

net.ipv4.tcp_max_tw_buckets = 5000

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_max_syn_backlog = 1024

net.ipv4.tcp_synack_retries = 2

net.ipv6.conf.all.disable_ipv6 = 0

net.ipv6.conf.default.disable_ipv6 = 0

net.ipv6.conf.lo.disable_ipv6 = 0

设置网卡，启用DHCP

修改网卡配置文件：

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

在原有配置后面增加输入以下信息：

Networking_IPV6=yes

DHCPV6C=yes

IPV6INIT=yes

然后重启网络：

service network restart

检查是否生效

[root@hSxavP1000044 network-scripts]# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

    link/ether 00:15:5d:1a:f7:05 brd ff:ff:ff:ff:ff:ff

    inet 172.16.2.7/12 brd 172.31.255.255 scope global eth0

       valid_lft forever preferred_lft forever

    inet6 2a01:4f8:212:1234:215:5dff:fe1a:f705/64 scope global mngtmpaddr dynamic 

       valid_lft 2591920sec preferred_lft 604720sec

    inet6 fe80::215:5dff:fe1a:f705/64 scope link 

       valid_lft forever preferred_lft forever

注意看eth0的网卡中ipv6地址是否被分配

[root@hSxavP1000044 network-scripts]# ping6 ipv6.google.com

PING ipv6.google.com(yw-in-x66.1e100.net (2607:f8b0:4002:c05::66)) 56 data bytes

64 bytes from yw-in-x66.1e100.net (2607:f8b0:4002:c05::66): icmp_seq=1 ttl=103 time=107 ms

64 bytes from yw-in-x66.1e100.net (2607:f8b0:4002:c05::66): icmp_seq=2 ttl=103 time=107 ms

^C

--- ipv6.google.com ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1002ms

rtt min/avg/max/mdev = 107.212/107.398/107.584/0.186 ms

ping6测试google的ipv6站点是否能通

[root@hSxavP1000044 network-scripts]# ip -6 route

2a01:4f8:212:1234::/64 dev eth0 proto kernel metric 256 expires 2591804sec pref medium

fe80::/64 dev eth0 proto kernel metric 256 pref medium

default via fe80::24b9:6e08:f5fd:b36f dev eth0 proto ra metric 1024 expires 1604sec pref medium

查看ipv6路由表

Debian / Ubuntu

开启IPv6功能

有些镜像是禁用了IPv6功能的，因此需要开启。首先查看一下是否被禁用了：

root@HIzcND1000044:~# sysctl -a | grep ipv6.*disable

sysctl: reading key "net.ipv6.conf.all.stable_secret"

net.ipv6.conf.all.disable_ipv6 = 1

sysctl: reading key "net.ipv6.conf.default.stable_secret"

net.ipv6.conf.default.disable_ipv6 = 1

sysctl: reading key "net.ipv6.conf.eth0.stable_secret"

net.ipv6.conf.eth0.disable_ipv6 = 1

sysctl: reading key "net.ipv6.conf.lo.stable_secret"

net.ipv6.conf.lo.disable_ipv6 = 1

disable=1说明被禁用了，因此需要去修改，配置文件为/etc/sysctl.conf

vi /etc/sysctl.conf

#把ipv6 disable的参数都改为0，然后保存，重载服务后生效

[root@hSxavP1000044 ~]# sysctl -p

root@HIzcND1000044:~# sysctl -p

vm.swappiness = 0

net.ipv4.neigh.default.gc_stale_time = 120

net.ipv4.conf.all.rp_filter = 0

net.ipv4.conf.default.rp_filter = 0

net.ipv4.conf.default.arp_announce = 2

net.ipv4.conf.lo.arp_announce = 2

net.ipv4.conf.all.arp_announce = 2

net.ipv4.tcp_max_tw_buckets = 5000

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_max_syn_backlog = 1024

net.ipv4.tcp_synack_retries = 2

net.ipv6.conf.all.disable_ipv6 = 0

net.ipv6.conf.default.disable_ipv6 = 0

net.ipv6.conf.lo.disable_ipv6 = 0

设置网卡，启用DHCP

nano /etc/network/interfaces

添加一行iface eth0 inet6 dhcp，举例示意：

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*
The loopback network interface
auto lo
iface lo inet loopback
The primary network interface
auto eth0
iface eth0 inet static
address 172.16.2.X
netmask 255.240.0.0
gateway 172.16.2.1
iface eth0 inet6 dhcp

重启网络，检查是否正常

service networking restart