ubuntu无法解析域名的问题

winecoding · **发表于 :** 2016-06-06 12:46

在lab top上装了 ubuntu 16。04 安装过程一切正常。也连上了家里的wireless，直接 ping IP address都是work的，譬如 ping 8.
8.8.8 但 ping google.com 就不work了.

代码:

>nslookup www.google.com
;; connection timed out; no servers could be reached

>ping www.cnn.com
ping : unknown host www.cnn.com

Google 了很多solution，主要都是为了改/etc/resolv.conf 这是我现在的输出，但仍然不工作. 请帮忙看看
应该怎么办

代码:

cat /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by   
resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
      Nameserver 8.8.8.8
      nameserver 127.0.1.1

cao627 · **发表于 :** 2016-06-06 14:59

Nameserver N改小写。

poloshiao · **发表于 :** 2016-06-06 16:06

把下面指令複製貼進終端機執行
1. sudo ls -al /etc | grep resolv.conf
2. sudo cat /etc/resolvconf/resolv.conf.d/head
把結果全部直接選取/複製/貼上來

winecoding · **发表于 :** 2016-06-07 11:36

这是这些命令的输出，谢谢

代码:

[b]sudo ls -al /etc |grep resolv.conf[/b]
lrwxrwxrwx   1 root root      29 Jun  5 18:55 resolv.conf -> ../run/resolvconf/resolv.conf

[b]sudo  cat /etc/resolvconf/resolv.conf.d/head[/b]
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN


[b] sudo cat /etc/resolv.conf[/b]
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 8.8.8.8
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 68.94.156.1
nameserver 68.94.157.1

poloshiao 写道:

把下面指令複製貼進終端機執行
1. sudo ls -al /etc | grep resolv.conf
2. sudo cat /etc/resolvconf/resolv.conf.d/head
把結果全部直接選取/複製/貼上來

poloshiao · **发表于 :** 2016-06-07 12:36

引用:

sudo ls -al /etc |grep resolv.conf
lrwxrwxrwx 1 root root 29 Jun 5 18:55 resolv.conf -> ../run/resolvconf/resolv.conf

1. /etc/resolv.conf 的內容實際上就是 /run/resolvconf/resolv.conf 的內容

引用:

sudo cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 8.8.8.8
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 68.94.156.1
nameserver 68.94.157.1

2. 在 /etc/resolv.conf 編輯內容就是編輯 /run/resolvconf/resolv.conf 的內容

引用:

sudo cat /etc/resolvconf/resolv.conf.d/head
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

3. 目前沒有有效的內容

4. 每次重新開機都會讀取許多網路設定檔內容用來重新更新 /run/resolvconf/resolv.conf 的內容也就是 /etc/resolv.conf 的內容
4-1. 其中包含讀取 /etc/resolvconf/resolv.conf.d/head 的內容

5. 意思是
5-1. 編輯 /etc/resolv.conf 只有一次性有效重開機就無效了
5-2. 要重開機還有效需要把
nameserver 127.0.1.1
nameserver 68.94.156.1
nameserver 8.8.8.8
加到
/etc/resolvconf/resolv.conf.d/head
再重開機
5-3. /etc/resolv.conf 的 nameserver 最好限於 3 個以內
第 4 個以後的 nameserver 被讀取的機會比較小
5-4. nameserver 127.0.1.1
最好排在第一個

winecoding · **发表于 :** 2016-06-07 13:01

谢谢你的帮助。我按照你的建议重新做了一遍，

代码:

sudo cat /etc/resolvconf/resolv.conf/head[/b]
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
nameserver 8.8.8.8
nameserver 68.94.156.1

但是

代码:

ping google.com

后的结果仍然是

代码:

ping: unknown host google.com

请帮忙再看看。还需要系统的什么信息。

poloshiao · **发表于 :** 2016-06-07 13:05

試試
ping -c 3 forum.ubuntu.org.cn

引用:

ping google.com

在大陸有些域名無法 ping

引用:

nameserver 127.0.1.1
nameserver 8.8.8.8
nameserver 68.94.156.1

修正為
nameserver 127.0.1.1
nameserver 68.94.156.1
nameserver 8.8.8.8

winecoding · **发表于 :** 2016-06-07 13:11

我不在大陆，所以应该不是这方面的问题

代码:

ping -c 3  forum.ubuntu.org.cn
ping: unknown host forum.ubuntu.org.cn

winecoding · **发表于 :** 2016-06-07 13:24

我又把这几个命令run了一遍，很奇怪，为什麽/etc/resolv.conf最后会有一个多出来的

代码:

nameserver 8.8.8.8

代码:

[b]cat /etc/resolvconf/resolv.conf.d/head[/b]
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
nameserver 68.94.156.1
nameserver 8.8.8.8

[b]cat /etc/resolvconf/resolv.conf.d/tail[/b]

[b]cat /etc/resolvconf/resolv.conf.d/base 
[/b]
[b]cat /etc/resolv.conf[/b]
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
nameserver 68.94.156.1
nameserver 8.8.8.8

nameserver 8.8.8.8

poloshiao · **发表于 :** 2016-06-08 6:07

引用:

我不在大陆，
ping -c 3 forum.ubuntu.org.cn
ping: unknown host forum.ubuntu.org.cn

1. 把下面指令複製貼進終端機執行
ping -c 3 192.157.242.155
把下面指令複製貼進終端機執行

引用:

为什麽/etc/resolv.conf最后会有一个多出来的
nameserver 8.8.8.8

2. 可能你還在
NM-Applet
或
/etc/network/interfaces
或其它地方又設定了 8.8.8.8
2-1. 不過多一個影響不大
將來發現了再移除即可

winecoding · **发表于 :** 2016-06-08 12:01

代码:

ping -c 3 192.157.242.155
PING 192.157.242.155 (192.157.242.155) 56(84) bytes of data.

--- 192.157.242.155 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2017ms

nslookup 192.157.242.155
;; connection timed out; no servers could be reached

有趣的是，我又试了一下

代码:

ping google.com

发现它竟能工作

代码:

PING google.com (216.58.194.206) 56(84) bytes of data.
bytes from 216.58.194.206: icmp_seq=2 ttl=52 time=70.6 ms
bytes from 216.58.194.206: icmp_seq=18 ttl=52 time=75.0 ms
bytes from 216.58.194.206: icmp_seq=21 ttl=52 time=67.4 ms

。但把这个窗口关了，再重新试，就又不工作了

代码:

ping google.com
ping: unknown host google.com

poloshiao · **发表于 :** 2016-06-08 15:23

引用:

ping -c 3 192.157.242.155
PING 192.157.242.155 (192.157.242.155) 56(84) bytes of data.
--- 192.157.242.155 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2017ms
nslookup 192.157.242.155
;; connection timed out; no servers could be reached

1. 如果這個一直不通就表示網路硬件或軟件還沒設定好
如果這個有時通有時不通就表示網路硬件或軟件不穩定
意思是不是無法解析域名引起的

引用:

有趣的是，我又试了一下
ping google.com
发现它竟能工作

2. whois 216.58.194.206 | grep NetName
確認這個 IPv4 是屬於 google.com

引用:

但把这个窗口关了，再重新试，就又不工作了

3. 如果你是從右上方 NM-Applet 設定連線
重新安裝 network-manager 有關套件看看
3-1. 先看看目前已經安裝哪些 network-manager 有關套件 ?
sudo dpkg -l | grep network-manager
3-2. 然後利用
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install --reinstall network-manager-套件名稱
重新安裝
3-2-1. 這的 network-manager-套件名稱指 3-1 顯示的已安裝 network-manager 有關套件
3-3. 重新開機

winecoding · **发表于 :** 2016-06-09 13:55

代码:

sudo apt-get update

没法完成，因为域名无法解析，

代码:

Connecting to us.archive.ubuntu.com] [Connecting to security.ubuntu.com]
Err:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease                  
  Temporary failure resolving 'us.archive.ubuntu.com'
Err:2 http://security.ubuntu.com/ubuntu xenial-security InRelease           
  Temporary failure resolving 'security.ubuntu.com'
0% [Connecting to us.archive.ubuntu.com]

代码:

whois

也不工作

代码:

whois 216.58.194.206| grep NetName
The program 'whois' is currently not installed. You can install it by typing:
sudo apt install whois


sudo apt install whois

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package whois is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'whois' has no installation candidate

真不知道怎么办了

cao627 · **发表于 :** 2016-06-09 15:49

你说ping 8.8.8.8是通的
那么ping 8.8.8.8 看看丢包率是多少。可能是丢包率太高导致的。

poloshiao · **发表于 :** 2016-06-09 15:50

引用:

Connecting to us.archive.ubuntu.com] [Connecting to security.ubuntu.com]
Err:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Temporary failure resolving 'us.archive.ubuntu.com'
Err:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
Temporary failure resolving 'security.ubuntu.com'
0% [Connecting to us.archive.ubuntu.com]

1. 使用文字編輯程式打開 /etc/hosts
加上這一行
91.189.91.23 us.archive.ubuntu.com # 注意中間空一格
1-1. 儲存
1-2. 然後
sudo apt-get update
看看能否順利更新還是出現其它錯誤訊息

2. 補充
2-1. 91.189.91.23 就是 us.archive.ubuntu.com 域名解析後的 IPv4
2-2. 換句話說 /etc/hosts 就是先在你本機內的進行域名解析
找不到才往外尋找域名解析
2-2-1. 如果你已經知道某個域名解析後的 IPv4
依照 1 的方法加在 /etc/hosts
你的本機就使用 /etc/hosts 來解析該域名不會再往外尋找解析

ubuntu无法解析域名的问题

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