L实例文档约束不支持ipv6，无法切换vpc，但是查询vpc和服务器规格均支持ipv6，可以通过辅助弹性网卡实现双栈。
宿主机
│
├── eth0
│
├── ns4012
│ │
│ ├── eth0.4012
│ ├── IPv4
│ ├── IPv6
│ ├── 默认路由
│ └── 服务A
│
└── 其它 namespace
先开启子网的ipv6，开启后创建辅助弹性网卡绑定至主网卡，创建辅助弹性网卡时注意开启ipv6
购买共享带宽，绑定辅助弹性网卡的eip和ipv6
系统内如下配置获取ipv6地址
40# cat /etc/rc.local
sleep 2
ip link add link eth0 name eth0.4012 type vlan id 4012
ip netns add ns4012
ip link set eth0.4012 netns ns4012
ip netns exec ns4012 ifconfig eth0.4012 hw ether fa:16:3e:74:cf:3f
ip netns exec ns4012 ifconfig eth0.4012 up
sleep 1
ip netns exec ns4012 dhclient -4 eth0.4012
ip netns exec ns4012 dhclient -6 eth0.4012
echo "$(date) rc.local start" >> /tmp/rc.local.log
测试结果
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