Question

由于我有一台新的思科路由器，我在恢复或启动笔记本电脑后无法浏览网页。我做了一些调试，似乎我有一个网络连接，但是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。我尝试使用Google Nameservers和我的互联网提供商的DNS服务器，但两者都有相同的结果。一切都被激发了一段时间后，一切正常。（意思是，互联网有效，所有尝试过的名字服务器回复得非常快）。

如果有人知道如何解决这个问题会很好。

额外信息：windows7，宽带连接，无线和有线连接都有这个问题。

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

有同样的问题。以下是Cisco EPC3925（有线ISP）背后的功能。

在Windows 7/8中打开网络和共享中心＆gt;管理适配器设置。您可能需要按住ALT按钮才能看到高级＆gt;高级设置选项。在适配器和绑定中，检查绑定是否在 TCP / IPv6

之前列出TCP / IPv4

Answer 2

天儿真好。多年来我在Cisco EPC-3925上遇到了类似的问题，有一次我甚至试验过IPv4＆amp; 6种设置（无济于事）。我发现我离开路由器的时间越长，ping越长，我的互联网连接越慢。

以下是您可以尝试的测试：重新启动3925并从speedtest.net获取结果（重启后我的速度接近120Mbps）。如果不重新启动路由器，请在12小时后再尝试速度测试，然后再测试24小时，48,72等。（您可以更频繁地测试，但结果不会那么好）。记录所有速度测试值，并查看路由器是否随着时间的推移而减慢速度。有传言说网络地址转换表（NAT）在某种程度上被破坏了，但我发现修复该问题的任何建议也都失败了（对我而言）。

我尝试了各种各样的东西来解决它，最后我在墙上使用了电源插座定时器，路由器插入其中。计时器每天凌晨3:30重新启动路由器 - 这解决了我的问题。这很粗糙，但很有效。不能解决根本问题，而是回避。

同样的事情可能对你有用...通过强迫你的PC睡觉，唤醒它，然后运行上面的测试看看会发生什么来进行测试。

只是一个想法，但可能适合你。

当然可能存在其他问题......例如您是否使用无线连接到路由器 - WIFI频道等是否存在任何干扰

关心，格雷格。

重启/恢复窗口后DNS查找延迟很长时间

2 个答案: