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sources/tech/20150225 Linux FAQs with Answers--How to disable IPv6 on Linux.md
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@ -2,7 +2,7 @@ Linux有问必答时间--如何在Linux下禁用IPv6
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> **问题**：我发现我的一个应用程序在尝试通过IPv6建立连接，但是由于我们本地网络不允许分配IPv6的流量，IPv6连接会超时，应用程序的连接会退回到IPv4，这样就会造成不必要的延迟。由于我目前对IPv6没有任何需求，所以我想在我的Linux主机上禁用IPv6。有什么比较合适的方法呢？
IPv6 has been introduced as a replacement of IPv4, the traditional 32-bit address space used in the Internet, to solve the imminent exhaustion of available IPv4 address space. However, since IPv4 has been used by every host or device connected to the Internet, it is practically impossible to switch every one of them to IPv6 overnight. Numerous IPv4 to IPv6 transition mechanisms (e.g., dual IP stack, tunneling, proxying) have been proposed to facilitate the adoption of IPv6, and many applications are being rewritten, as we speak, to add support for IPv6. One thing for sure is that IPv4 and IPv6 will inevitably coexist for the forseeable future.
IPv6被认为是IPv4——互联网上的传统32位地址空间的替代产品，它为了解决现有IPv4地址空间即将耗尽的问题。However, since IPv4 has been used by every host or device connected to the Internet, it is practically impossible to switch every one of them to IPv6 overnight. Numerous IPv4 to IPv6 transition mechanisms (e.g., dual IP stack, tunneling, proxying) have been proposed to facilitate the adoption of IPv6, and many applications are being rewritten, as we speak, to add support for IPv6. One thing for sure is that IPv4 and IPv6 will inevitably coexist for the forseeable future.
Ideally the [ongoing IPv6 transition process][1] should not be visible to end users, but the mixed IPv4/IPv6 environment might sometimes cause you to encounter various hiccups originating from unintended interaction between IPv4 and IPv6. For example, you may experience timeouts from applications such as apt-get or ssh trying to unsuccessfully connecting via IPv6, DNS server accidentally dropping AAAA DNS records for IPv6, or your IPv6-capable device not compatible with your ISP's legacy IPv4 network, etc.