打开光猫的管理页面，用户名username，密码：nE7jA%5m，进入internet连接配置页面，选择连接名称如下图，IP模式选择IPv4&IPv6，IPv6信息选择默认。
然后查看Ubuntu的接口信息，发现有IPv6地址：
eno1 Link encap:Ethernet HWaddr 74:d4:35:19:8f:9c
inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: 240e:fa:c60e:f500:896b:240:7ab3:b6a4/64 Scope:Global
inet6 addr: fe80::6b31:7e2d:2e3d:f84f/64 Scope:Link
inet6 addr: fd3e:da8a:bd79:0:3323:9c07:548a:719f/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:247005 errors:0 dropped:0 overruns:0 frame:0
TX packets:357426 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:157059800 (157.0 MB) TX bytes:304943523 (304.9 MB)
Interrupt:20 Memory:f0400000-f0420000
然后进入测试网站测试http://www.test-ipv6.com/index.html.zh_CN
ping上海交大的IPv6站点：
$ ping6 ipv6.sjtu.edu.cn
PING ipv6.sjtu.edu.cn(2001:da8:8000:1::80) 56 data bytes
64 bytes from 2001:da8:8000:1::80: icmp_seq=1 ttl=38 time=258 ms
64 bytes from 2001:da8:8000:1::80: icmp_seq=2 ttl=38 time=251 ms
64 bytes from 2001:da8:8000:1::80: icmp_seq=3 ttl=38 time=257 ms
64 bytes from 2001:da8:8000:1::80: icmp_seq=4 ttl=38 time=251 ms