开启限制

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vim /etc/sysctl.conf

# 增加配置
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0

查看是否生效

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ifconfig

# 信息
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 114.55.127.xxx  netmask 255.255.252.0  broadcast 114.55.119.255
        inet6 fe80::219:3eff:fexx:32ec  prefixlen 64  scopeid 0x20<link>
        ether 00:16:3e:01:49:37  txqueuelen 1000  (Ethernet)
        RX packets 68348  bytes 41664492 (39.7 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 18859  bytes 3632548 (3.4 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fe80::219:3eff:fexx:32ec 是IPv6地址。