重启/恢复窗口后DNS查找的长时间延迟

Question

由于我有一个新的思科路由器，我有困难浏览网络后，恢复或启动我的笔记本电脑。我做了一些调试，我似乎有一个网络连接，但DNS失败了一段时间(比如说，超过50秒)。

您可以在下面的ping、和nslookup输出中看到我的意思。我尝试过用谷歌名称服务器和我的互联网提供商的DNS服务器，但两者的结果是一样的。一切都启动一段时间后，一切正常。(这意味着，互联网有效，所有尝试过的同名用户回复速度都非常快)。

如果有人知道如何解决这个问题就好了。

附加信息: windows7、宽带连接、wifi和电缆连接都存在这个问题。

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>ping 8.8.8.8

Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=18ms TTL=54
Reply from 8.8.8.8: bytes=32 time=21ms TTL=54
Reply from 8.8.8.8: bytes=32 time=16ms TTL=54
Reply from 8.8.8.8: bytes=32 time=18ms TTL=54

Ping statistics for 8.8.8.8:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 16ms, Maximum = 21ms, Average = 18ms

C:\Windows\system32>nslookup
DNS request timed out.
    timeout was 2 seconds.
Default Server:  UnKnown
Address:  8.8.8.8

> www.google.com
Server:  UnKnown
Address:  8.8.8.8

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> www.google.com
Server:  UnKnown
Address:  8.8.8.8

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> www.google.com
Server:  UnKnown
Address:  8.8.8.8

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
> www.google.com
Server:  UnKnown
Address:  8.8.8.8

--------8<------after a while---------

C:\Windows\system32>ping 8.8.8.8

Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=18ms TTL=54
Reply from 8.8.8.8: bytes=32 time=21ms TTL=54
Reply from 8.8.8.8: bytes=32 time=16ms TTL=54
Reply from 8.8.8.8: bytes=32 time=18ms TTL=54

Ping statistics for 8.8.8.8:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 16ms, Maximum = 21ms, Average = 18ms

C:\Windows\system32>nslookup
DNS request timed out.
    timeout was 2 seconds.
Default Server:  [8.8.8.8]
Address:  8.8.8.8

> www.google.com
Server:  [8.8.8.8]
Address:  8.8.8.8

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
Non-authoritative answer:
Name:    www.l.google.com
Addresses:  173.194.66.99
          173.194.66.106
          173.194.66.147
          173.194.66.103
          173.194.66.104
          173.194.66.105
Aliases:  www.google.com

Answer 1

也有同样的问题。这里是我的工作，在思科EPC3925 (有线电视服务提供商)。

在Windows 7/8中，开放网络和共享中心>管理适配器设置。您可能需要按住ALT按钮以查看“高级”>“高级设置”选项。在适配器和绑定中，检查绑定是否在TCP/IPv6 6之前列出TCP/IPv6 4。

Answer 2

G‘’Day。多年来，我在Cisco 3925上遇到了类似的问题，有一次我甚至尝试过IPv4 &6设置(但没有结果)。我发现我离开路由器的时间越长，pings就越长，我的互联网连接速度也就越慢。

下面是一个您可以尝试的测试:重新启动3925并从speedtest.net获得结果(重启后我的测试接近120 mine)。在不重新启动路由器的情况下，12小时后再试一次速度测试，然后24小时、48小时、72小时等(您可以更频繁地进行测试，但结果不会那么好)。记录所有的速度测试值，看看你的路由器是否随着时间的推移而减速。有传言说，网络地址翻译表(NAT)以某种方式被破坏了，但是我发现解决这个问题的任何建议都失败了(对我来说)。

我尝试了各种各样的方法来修复它，最后我在墙上使用了一个电源插座计时器，路由器也插了进去。计时器每天凌晨3:30重新启动路由器--这为我解决了这个问题。很粗糙，但很有效。不能解决根本的问题，而是回避。

同样的事情可能对你有用..。测试通过强迫你的电脑睡觉，唤醒它，然后运行上面的测试，看看会发生什么。

只是个主意，但可能对你有用。

当然还有其他问题..。例如，您是否使用到路由器的无线连接?是否存在对WIFI信道等的任何干扰。

你好，格雷格。