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[Translated]How to disable Ipv6 on Ubuntu or Linux Mint or Debian
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Translating--------------geekpi
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How to disable Ipv6 on Ubuntu, Linux Mint, Debian
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如何在Ubuntu,Linux Mint,Debian上禁用Ipv6
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================================================================================
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### Ipv6 ###
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Ipv6 is the next version of the addressing scheme Ipv4 that is currently being used to assign numerical address to domain names like google.com over the internet.
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IPv6是寻址方案Ipv4的下一个版本,被用来给如google.com这样的域名分配数字地址。
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Ipv6 allows for more addresses than what Ipv4 supports. However it is not yet widely supported and its adoption is still in progress.
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Ipv6比Ipv4支持更多的地址。然而，它还没有被广泛支持，还在被接受的过程中。
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### Does your system support ipv6 ? ###
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### 你的系统支持Ipv6么? ###
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For Ipv6 to work for you, there are many things needed. First of all you need a system/OS that supports IPv6. Ubuntu Linux Mint and most modern distros do that. If you take a look at the output of ifconfig you can see ipv6 addresses assigned to the network interfaces
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为了支持Ipv6，需要很多事情。首先你需要系统/操作系统支持Ipv6。Ubuntu，Linux Mint，和大多是现代发行版都支持它。如果你看一下ifconfig指令的输出，你就会看见你的网络接口被分配了ipv6地址。
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$ ifconfig
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eth0 Link encap:Ethernet HWaddr 00:1c:c0:f8:79:ee
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@ -33,14 +30,15 @@ For Ipv6 to work for you, there are many things needed. First of all you need a
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collisions:0 txqueuelen:0
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RX bytes:4900560 (4.9 MB) TX bytes:4900560 (4.9 MB)
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Check the line "inet6 addr".
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看一下行“inet6 addr”。
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Next you need a router/modem that also supports ipv6. And beyond that, your ISP must also support ipv6.
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接下来你需要一个支持ipv6的路由器/调制解调器。额外地，你的ISP也必须支持ipv6。
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Instead of checking every part of the network infrastructure, its better to just find out if you can connect to websites over ipv6.
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There are lots of websites that test ipv6 support on your connection. Check out [http://testmyipv6.com/][1] for example.
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除了检查网络设备的每一部分，最好查出你是否可以通过ipv6访问网站。
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The kernel parameters that enable ipv6 are as follows
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有很多网站可以检测你的连接是否支持ipv6. 这里就是个例子：[http://testmyipv6.com/][1]
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下面是在内核中启用ipv6的参数：
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$ sysctl net.ipv6.conf.all.disable_ipv6
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net.ipv6.conf.all.disable_ipv6 = 0
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@ -51,18 +49,18 @@ The kernel parameters that enable ipv6 are as follows
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$ sysctl net.ipv6.conf.lo.disable_ipv6
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net.ipv6.conf.lo.disable_ipv6 = 0
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The same can be also be checked from the proc files
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同样可以在proc文件中检查
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$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6
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0
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Note that the variables control "disabling" of ipv6. So setting them to 1 would disable ipv6
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注意这里的变量是控制ipv6的“禁用”。所以设置1就会禁用ipv6。
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### Disable ipv6 if its not supported ###
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### 如果它不支持就禁用ipv6 ###
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So if ipv6 is not supported on your network infrastructure, it might be useful to disable it all together. Why ? It can cause issues like delayed domain lookups, un-necessary attempts to connect to ipv6 addresses causing delay in network connection etc.
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如果你的网络设备中不支持ipv6，那最好就全部禁用它们。为什么？因为这回引起延迟域查询，在网络连接中不必要地尝试连接到ipv6地址导致延迟等等问题。
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I did come across some problems like that. The apt-get command occasionally tries to connect to ipv6 addresses and fails and then retries an ipv4 address. Take a look at this output
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我也遇到过像这样的问题，apt-get命令偶尔会尝试连接到ipv6地址失败接着检索ipv4地址。看一下下面的输出。
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$ sudo apt-get update
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Ign http://archive.canonical.com trusty InRelease
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@ -74,32 +72,32 @@ I did come across some problems like that. The apt-get command occasionally trie
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.....
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Errors like those have been more frequent in the recent Ubuntu versions, probably because they try to use Ipv6 more than before.
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像这样的错误在最近的Ubuntu中更频繁了，或许它比以前更频繁地尝试使用IPv6地址。
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I noticed similar issues happen in other applications like Hexchat and also Google Chrome which would sometimes take longer than usual to lookup a domain name.
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我在其他的应用上也注意到了相似的问题，如Hexchat，同样Google Chrome也会有时会在查询域名的时候花费更长的时间。
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So the best solution is to disable Ipv6 entirely to get rid of those things. It takes only a small configuration and can help you solve many network issues on your system. Users have even reported an increase in internet speed.
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所以最好的方案是完全禁用Ipv6来摆脱这些事情。这只需要一点点配置但可以帮助你解决很多你系统上的很多问题。用户甚至反应这可以加速网络。
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#### Disable Ipv6 - Method 1 ####
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#### 禁用 Ipv6 - 方案1 ####
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Edit the file - /etc/sysctl.conf
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编辑文件 - /etc/sysctl.conf
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$ sudo gedit /etc/sysctl.conf
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And fill in the following lines at the end of that file
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在文件的最后加入下面的行。
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# IPv6 disabled
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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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net.ipv6.conf.lo.disable_ipv6 = 1
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Save the file and close it
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保存并关闭
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Restart sysctl with
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重启sysctl
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$ sudo sysctl -p
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Check the output of ifconfig again and there should be no ipv6 address
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再次检查ifconfig的输出，这里应该没有ipv6地址了。
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$ ifconfig
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eth0 Link encap:Ethernet HWaddr 08:00:27:5f:28:8b
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@ -111,28 +109,29 @@ Check the output of ifconfig again and there should be no ipv6 address
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RX bytes:1501691 (1.5 MB) TX bytes:104883 (104.8 KB)
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If it does not work, then try rebooting the system and check ifconfig again.
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如果不行，尝试重启系统并再次检查ifconfig
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#### Disable ipv6 - GRUB method ####
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#### 禁用 ipv6 - GRUB 方案 ####
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Ipv6 can also be disabled by editing the grub configuration file
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Ipv6同样可以通过编辑grub配置文件禁用。
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$ sudo gedit /etc/default/grub
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Look for the line containing "GRUB_CMDLINE_LINUX" and edit it as follows
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查找包含"GRUB_CMDLINE_LINUX"的行，并如下编辑：
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GRUB_CMDLINE_LINUX="ipv6.disable=1"
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The same can also be added to the value of the variable named "GRUB_CMDLINE_LINUX_DEFAULT" and either would work. Save the file, close it and regenerate the grub configuration
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同样可以加入名为"GRUB_CMDLINE_LINUX_DEFAULT"的变量，这同样有用。保存并关闭文件，重新生成grub配置。
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$ sudo update-grub2
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Reboot. Now ipv6 should be disabled.
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重启，现在ipv应该就已经禁用了。
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--------------------------------------------------------------------------------
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via: http://www.binarytides.com/disable-ipv6-ubuntu/
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译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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译者：[geekpi](https://github.com/geekpi) 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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