CentOS7关闭TCP6
查看是否有TCP6协议
> netstat -lanput
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1129/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1293/master
tcp 0 36 192.168.1.28:22 192.168.1.3:1947 ESTABLISHED 1617/sshd: root@pts
tcp6 0 0 :::22 :::* LISTEN 1129/sshd
tcp6 0 0 ::1:25 :::* LISTEN 1293/master
udp 0 0 127.0.0.1:323 0.0.0.0:* 737/chronyd
udp 0 0 0.0.0.0:68 0.0.0.0:* 940/dhclient
udp6 0 0 ::1:323 :::* 737/chronyd编辑 grub 文件
> vim /etc/default/grub
#---------------------------
... ...
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
... ...
#---------------------------
改为
#---------------------------
... ...
GRUB_CMDLINE_LINUX="crashkernel=auto ipv6.disable=1 rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
... ...
#---------------------------在GRUB_CMDLINE_LINUX加上 ipv6.disable=1
重新生成grub.cfg文件
> grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-1062.18.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1062.18.1.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1062.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1062.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-eba9c4026eaa46eb9c1467a1afc213ca
Found initrd image: /boot/initramfs-0-rescue-eba9c4026eaa46eb9c1467a1afc213ca.img
done重启系统
> shutdown -r now
# 查看ip6是否关闭
> netstat -lanput
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1081/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1323/master
tcp 0 36 192.168.1.28:22 192.168.1.3:2506 ESTABLISHED 1594/sshd: root@pts
udp 0 0 127.0.0.1:323 0.0.0.0:* 728/chronyd
udp 0 0 0.0.0.0:68 0.0.0.0:* 907/dhclient