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95 lines
2.3 KiB
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95 lines
2.3 KiB
Markdown
How To Disable IPv6 In CentOS 7
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Recently, one of my friend asked me how to disable IPv6. After searching a bit, I found the following solution. Here is the steps that I followed to disable IPv6 in my CentOS 7 minimal server.
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You can do it in two methods.
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### Method 1 ###
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Edit file **/etc/sysctl.conf**,
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vi /etc/sysctl.conf
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Add the following lines:
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net.ipv6.conf.all.disable_ipv6 = 1
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net.ipv6.conf.default.disable_ipv6 = 1
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If you want to disable IPV6 for particular network card, for example enp0s3, add the following entry.
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net.ipv6.conf.enp0s3.disable_ipv6 = 1
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Save and exit the file.
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Execute the following command to reflect the changes.
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sysctl -p
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### Method 2: ###
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To IPv6 disable in the running system, enter the following commands one by one:
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echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
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echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6
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or,
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sysctl -w net.ipv6.conf.all.disable_ipv6=1
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sysctl -w net.ipv6.conf.default.disable_ipv6=1
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That’s it. Now IPv6 has been disabled.
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### What If I get issues after disabling IPv6? ###
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You may get problems after disabling IPv6.
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#### Issue 1: ####
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if you get issues with SSH after disabling IPv6, do the following.
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Edit **/etc/ssh/sshd_config** file,
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vi /etc/ssh/sshd_config
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Find the line;
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#AddressFamily any
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And. change it to:
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AddressFamily inet
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or,
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Remove the hash mark **(#)** in front of the line:
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#ListenAddress 0.0.0.0
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Then, restart ssh to reflect the changes.
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systemctl restart sshd
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#### Issue 2: ####
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If you get problems with starting postfix after disabling IPv6, edit **/etc/postfix/main.cf** file;
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vi /etc/postfix/main.cf
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and comment out the localhost part of the config and use ipv4 loopback.
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#inet_interfaces = localhost
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inet_interfaces = 127.0.0.1
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That’s it. Cheers!
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--------------------------------------------------------------------------------
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via: http://www.unixmen.com/disable-ipv6-centos-7/
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作者：[SK][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.unixmen.com/author/sk/ |