Google发布免费DNS解析服务
December 4th, 2009
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本文来自: Solidot.
Google宣布 推出免费的DNS解析服务Google Public DNS。
DNS协议是Web的重要组成部分，它就如同是互联网的“电话簿”。每次访问一个网站，计算机都须执行一次DNS查询。复杂的网页在载入之前需执行多次DNS查询，其结果是普通网民每天必须执行数百次DNS查询，这会降低用户的浏览体验。Google推出Public DNS便是试图改进浏览体验，让互联网变得更快(在TTL记录过期之前执行prefetching，更新缓存)，更安全（支持新的DNS安全扩展DNSSEC）。Google Public DNS托管在Google分布在全世界的数据中心，它使用选播路由算法（Anycast Routing）把用户的DNS解析请求发送到地理位置最近的数据中心。Google Public DNS遵循DNS标准，向用户的计算机提供正确的响应，不会有任何屏蔽、过滤，或重新定向等妨碍用户浏览体验的行为。Google Public DNS的IP地址为：8.8.8.8以及8.8.4.4。
修改TCP/IP的DNS服务器地址：
Microsoft Windows
DNS settings are specified in the TCP/IP Properties window for the selected network connection.
Example: Changing DNS server settings on Microsoft Windows Vista
- Go the Control Panel.
- Click Network and Internet, then Network and Sharing Center, then Manage network connections.
- Select the connection for which you want to configure Google Public DNS. For example:
- To change the settings for an Ethernet connection, right-click Local Area Connection, and click Properties.
- To change the settings for a wireless connection, right-click Wireless Network Connection, and click Properties.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
- Select the Networking tab. Under This connection uses the following items, clickInternet Protocol Version 4 (TCP/IPv4), and then click Properties.
- Click Advanced and select the DNS tab. If there are any DNS server IP addresses listed there, write them down for future reference, and remove them from this window.
- Click OK.
- Select Use the following DNS server addresses. If there are any IP addresses listed in the Preferred DNS server or Alternate DNS server, write them down for future reference.
- Replace those addresses with the IP addresses of the Google DNS servers: 8.8.8.8 and 8.8.4.4.
- Restart the connection you selected in step 3.
- Test that your setup is working correctly; see Testing your new settings below.
- Repeat the procedure for additional network connections you want to change.
Mac OS X
DNS settings are specified in the Network window.
Example: Changing DNS server settings on Mac OS 10.5
- From the Apple menu, click System Preferences, then click Network. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
- Select the connection for which you want to configure Google Public DNS. For example:
- To change the settings for an Ethernet connection, select Built-In Ethernet, and click Advanced.
- To change the settings for a wireless connection, select Airport, and clickAdvanced.
- Select the DNS tab.
- Click + to replace any listed addresses with, or add, the Google IP addresses at the top of the list: 8.8.8.8 and 8.8.4.4.
- Click Apply and OK.
- Test that your setup is working correctly; see Testing your new settings below.
- Repeat the procedure for additional network connections you want to change.
Linux
DNS settings are specified in /etc/resolv.conf in most distributions.
Example: Changing DNS server settings on Ubuntu
- Edit /etc/resolv.conf:
sudo vi /etc/resolv.conf
- If any
nameserverlines appear, write down the IP addresses for future reference. - Replace the
nameserverlines with, or add, the following lines:nameserver 8.8.8.8 nameserver 8.8.4.4
- Save and exit.
- Restart any Internet clients you are using.
- Test that your setup is working correctly; see Testing your new settings below.
–
Bian Jiang
Blog: http://www.wifihack.net/
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