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Luis Abreu
Asked: 2023-08-06 23:55:09 +0800 CST

Ipv6 与 Ipv4：有没有办法强制使用 ipv6？

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Ubuntu/Linux 初学者，所以我想知道是否有任何方法可以强制 Ubuntu 在解析名称时更喜欢 IPv4 或 IPv6（例如：google.com 有 ipv4 和 ipv6 地址。是否有任何设置允许我说 IPv6当某些应用程序要求使用该名称时，应该优先于 IPv4？）

谢谢。

dns

1 个回答

  1. Best Answer

    您可以在/etc/gai.conf文件中更改它。

    来自man gai.conf：

    DESCRIPTION
       A  call  to getaddrinfo(3) might return multiple answers.  According to
       RFC 3484 these answers must be sorted so that the answer with the high‐
       est  success  rate is first in the list.  The RFC provides an algorithm
       for the sorting.  The static rules are  not  always  adequate,  though.
       For  this  reason,  the  RFC  also  requires that system administrators
       should have the possibility to dynamically change the sorting.  For the
       glibc implementation, this can be achieved with the /etc/gai.conf file.

       Each  line  in the configuration file consists of a keyword and its pa‐
       rameters.  White spaces in any place are ignored.  Lines starting  with
       '#' are comments and are ignored.

    该文件中有一个注释行部分您可以更改。其中有一行特别指出：

    #    For sites which prefer IPv4 connections change the last line to
#
#precedence ::ffff:0:0/96  100

    这意味着，如果您希望 IPv4 优于 IPv6，您基本上只需取消上面几行的注释，并将最后一行更改为注释所指出的内容即可。

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