CentOS 7 Forbidden IPv6

Source: Internet
Author: User


How to disable IPv6 in CentOS 7


Https://Linux.cn/article-4935-1.html



Recently, a friend of mine asked me how I should prohibit IPv6. After searching for a few, I found the following scenario. Here's how to disable IPv6 on my CentOS 7 mini-server.






You can do this in two ways.


Edit File/etc/sysctl.conf,




    • VI /etc/sysctl. conf


Add the following line:


  • NET. IPv6. Conf. All. Disable_ipv6 = 1
  • NET. IPv6. Conf. Default. Disable_ipv6 = 1


If you want to disable IPV6 for a particular NIC, for example, for ENP0S3, add the following line.


    • NET. IPv6. Conf. Enp0s3. Disable_ipv6 = 1


Save and exit the file.



Execute the following command to make the setting effective.


    • Sysctl -p
To disable IPV6 in a running system, enter the following command:




  • echo 1 > /proc/sys/net/ipv6 /conf/all/disable_ipv6
  • echo 1 > /proc/sys/net/ipv6 /conf/default/< Span class= "PLN" style= "color: #b8ffb8" >disable_ipv6


or,

  • sysctl-w Net.ipv6.conf. All. Disable_ipv6=1
  • sysctl -w Net.ipv6.conf. Default. Disable_ipv6=1


That's it. Now the IPV6 has been banned.


You may have some problems after banning IPv6.




If you are having problems with SSH after you disable IPV6, follow the instructions below.





Edit /etc/ssh/sshd_config File



Vi/etc/ssh/sshd_config



Locate the following line:


    • #addressfamily any


Change it to:


    • AddressFamily inet


Or, remove the comment (#) in front of the line:


    • #listenaddress 0.0. 0.0


Then restart SSH for the change to take effect.


    • Systemctl Restart sshd
If you are having trouble starting postfix after you disable Ipv6, edit/ETC/POSTFIX/MAIN.CF:




    • VI /etc/postfix/main. CF


Comment out the localhost part of the configuration and use the IPv4 loopback.


    • #inet_ Interfaces = localhost
    • inet_interfaces = 127.0. 0.1


That's it, cheers!






CentOS 7 Forbidden IPv6


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