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Translating----geekpi
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How To Disable IPv6 In CentOS 7
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================================================================================
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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/
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96
translated/tech/20150119 How To Disable IPv6 In CentOS 7.md
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96
translated/tech/20150119 How To Disable IPv6 In CentOS 7.md
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@ -0,0 +1,96 @@
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如何在CentOS 7中禁止IPv6
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================================================================================
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最近，我的一位朋友问我该如何禁止IPv6。在搜索了一番之后，我找到了下面的方案。下面就是我在CentOS 7迷你版中禁止IPv6的方法。
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你可以用两个方法做到这个。
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### 方法 1 ###
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编辑文件**/etc/sysctl.conf**，
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vi /etc/sysctl.conf
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添加下面的行：
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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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如果你想要为特定的网卡禁止IPv6，比如，对于enp0s3，添加下面的行。
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net.ipv6.conf.enp0s3.disable_ipv6 = 1
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保存并退出文件。
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执行下面的命令来使设置生效。
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sysctl -p
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### 方法 2 ###
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要在运行的系统中禁止IPv6，依次输入下面的命令：
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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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或者，
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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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就是这样。现在IPv6已经禁止了。
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### 我在禁止IPv6后遇到问题怎么办 ###
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You may get problems after disabling IPv6.
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你可能在禁止IPv6后遇到一些问题
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#### 问题1： ####
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如果你在禁止IPv6后SSH遇到问题，按照下面的做。
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编辑 **/etc/ssh/sshd_config** 文件
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vi /etc/ssh/sshd_config
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找到下面的行：
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#AddressFamily any
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把它改成：
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AddressFamily inet
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或者，
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在这行的前面去掉注释**(#)**：
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#ListenAddress 0.0.0.0
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接着重启ssh来使改变生效。
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systemctl restart sshd
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#### 问题2： ####
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如果你在禁止Ipv6后启动postfix遇到问题，编辑**/etc/postfix/main.cf**：
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vi /etc/postfix/main.cf
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注释掉配置中的localhost部分，并且使用ipv4回环。
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#inet_interfaces = localhost
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inet_interfaces = 127.0.0.1
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就是这样，干杯！
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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：[geekpi](https://github.com/geekpi)
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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/
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