NAT服务器开启并获取独立公网IPv6地址

[dalaolala]

CentOS7系统开启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

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
执行 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