http://jianchen.iteye.com/blog/296903
2008
A 写道
问:我所在的网络经常出现可以用IP访问却不能用域名访问的问题，除服务器上的设置问题，还有什么原
因可能导致这种问题？
答:我们在访问网站时如果采用域名方式，在进行访问前还需要将你输入的域名通过DNS服务器转换为
IP地址，如果DNS服务器出现故障或无法连接DNS 服务器，就无法获取网站的IP自然而然也就无法访问网
站。为了提高网站访问速度，系统会自动将已经访问过并获取了IP地址的网站存入本地的DNS缓存里，一
旦再对这个网站进行访问，则不再通过DNS服务器而直接从缓存中取出该网站的IP地址进行访问。但有时
就是因为本地DNS缓存出现了问题，而导致了网站无法访问的故障。可以通过在命令行方式(运行CMD.EXE)
下输入命令“ipconfig /flushdns”(不含引号)来重建本地DNS缓存，就能解决这个问题。
IPCONFIG命令的使用:
在windows控制台下输入:>ipconfig /?
得到以下结果:
USAGE:
ipconfig [/? | /all | /renew [adapter] | /release [adapter] |
/flushdns | /displaydns | /registerdns |
/showclassid adapter |
/setclassid adapter [classid] ]
where
adapter Connection name
(wildcard characters * and ? allowed, see examples)
Options:
/? Display this help message
/all Display full configuration information.
/release Release the IP address for the specified adapter.
/renew Renew the IP address for the specified adapter.
/flushdns Purges the DNS Resolver cache.
/registerdns Refreshes all DHCP leases and re-registers DNS names
/displaydns Display the contents of the DNS Resolver Cache.
/showclassid Displays all the dhcp class IDs allowed for adapter.
/setclassid Modifies the dhcp class id.
The default is to display only the IP address, subnet mask and
default gateway for each adapter bound to TCP/IP.
For Release and Renew, if no adapter name is specified, then the IP address
leases for all adapters bound to TCP/IP will be released or renewed.
For Setclassid, if no ClassId is specified, then the ClassId is removed.
Examples:
> ipconfig ... Show information.
> ipconfig /all ... Show detailed information
> ipconfig /renew ... renew all adapters
> ipconfig /renew EL* ... renew any connection that has its
name starting with EL
> ipconfig /release *Con* ... release all matching connections,
eg. "Local Area Connection 1" or
"Local Area Connection 2"
在控制台输入以下命令可以查看有哪些dns缓存:
写道
>ipconfig /displaydns
写道
Windows IP Configuration
xtx.kv8.info
----------------------------------------
Record Name . . . . . : xtx.kv8.info
Record Type . . . . . : 1
Time To Live . . . . : 590231
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 127.0.0.1
fds.ppstream.net
----------------------------------------
Record Name . . . . . : fds.ppstream.net
Record Type . . . . . : 1
Time To Live . . . . : 2493
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 61.172.196.99
3.joppnqq.com
----------------------------------------
Record Name . . . . . : 3.joppnqq.com
Record Type . . . . . : 1
Time To Live . . . . : 590231
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 127.0.0.1
1.jopenkk.com
----------------------------------------
Record Name . . . . . : 1.jopenkk.com
Record Type . . . . . : 1
Time To Live . . . . : 590231
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 127.0.0.1
xxx.m111.biz
----------------------------------------
Record Name . . . . . : xxx.m111.biz
Record Type . . . . . : 1
Time To Live . . . . : 590231
Data Length . . . . . : 4
Section . . . . . . . : Answer
A (Host) Record . . . : 127.0.0.1
1.0.0.127.in-addr.arpa
----------------------------------------
Record Name . . . . . : 1.0.0.127.in-addr.arpa.
Record Type . . . . . : 12
Time To Live . . . . : 590231
Data Length . . . . . : 4
Section . . . . . . . : Answer
PTR Record . . . . . : localhost
Record Name . . . . . : 1.0.0.127.in-addr.arpa.
Record Type . . . . . : 12
Time To Live . . . . : 590231
Data Length . . . . . : 4
Section . . . . . . . : Answer
PTR Record . . . . . : yu.8s7.net
............省略以下打印输出
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