查看网络情况
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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
link/ether 00:0c:29:bc:2c:67 brd ff:ff:ff:ff:ff:ff
inet 192.168.200.10/24 brd 192.168.200.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::cb2b:20f:70fb:d627/64 scope link noprefixroute
valid_lft forever preferred_lft forever
看到inet6的内容，就表示系统启用了ipv6的支持。
编辑 /etc/sysctl.conf
net.ipv6.conf.ens33.disable_ipv6 = 1
让修改马上生效。需要注意的是你的网卡名字，现在都已经不是eth0，ens33，我的虚拟机。
# sysctl -p
net.ipv6.conf.ens33.disable_ipv6 = 1查看网络情况
# ip a
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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:bc:2c:67 brd ff:ff:ff:ff:ff:ff
inet 192.168.200.10/24 brd 192.168.200.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever对比一下就能看到区别。
参考文章
https://www.thegeekdiary.com/centos-rhel-7-how-to-disable-ipv6-on-a-specific-interface-only/
