unknown怎么处理域名解析长期不稳定的解决和nslookup命令的用法
域名故障解析ip变来变去.www.weblesson的域名总在两个ip之间变化。它的根域名weblesson很稳定。
这样一来,这个域名有时就不能访问.长期如此.
通过ping 域名 ,发现域名对应ip地址不时变化.
用操作系统的左下角->开始->运行，输入命令  ipconfig /flushdns 然后回车执行,清除本地缓存.确认与本地无关.
通过nslookup命令,溯源查错:
C:\Documents and Settings\lyz>nslookup weblesson
*** Can't find server name for address 202.96.69.38: Server failed Server: ns.lnpta Address: 202.96.64.68 Non-authoritative answer: Name: weblesson
Address: 203.171.231.2
C:\Documents and Settings\lyz>nslookup www.weblesson
*** Can't find server name for address 202.96.69.38: Server failed Server: ns.lnpta Address: 202.96.64.68 Non-authoritative answer: Name: www.weblesson
Addresses: 203.171.231.2, 121.199.253.180 
C:\Documents and Settings\lyz>nslookup  www.weblesson 202.96.64.68
Server:  ns.lnpta
Address:  202.96.64.68
Non-authoritative answer:
Name:    www.weblesson
Addresses:  121.199.253.180, 203.171.231.2
C:\Documents and Settings\lyz>nslookup  -q www.weblesson
*** Can't find server name for address 202.96.69.38: Server failed
Server:  ns.lnpta
Address:  202.96.64.68
Non-authoritative answer:
Name:    www.weblesson
Addresses:  203.171.231.2, 121.199.253.180
C:\Documents and Settings\lyz>nslookup  -norecurse www.weblesson
*** Can't find server name for address 202.96.69.38: Server failed
Server:  ns.lnpta
Address:  202.96.64.68
Non-authoritative answer:
Name:    www.weblesson
Addresses:  203.171.231.2, 121.199.253.180
C:\Documents and Settings\lyz>nslookup  -norecurse www.weblesson  202.96.64.6
8
Server:  ns.lnpta
Address:  202.96.64.68
Name:    www.weblesson
Served by:
- ns.cernet
          202.112.0.44
          cn
- c.dns
          203.119.27.1
          cn
- a.dns
          203.119.25.1
          cn
- e.dns
          203.119.29.1
          cn
- b.dns
          203.119.26.1
          cn
- d.dns
          203.119.28.1
          cn
C:\Documents and Settings\lyz>
Microsoft Windows XP [版本 5.1.2600]
(C) 版权所有 1985-2001 Microsoft Corp.
C:\Documents and Settings\lyz>nslookup  -norecurse www.weblesson  202.112.0.4
4
*** Can't find server name for address 202.112.0.44: Query refused
Server:  UnKnown
Address:  202.112.0.44
Name:    www.weblesson
Served by:
- dns10.hichina
          weblesson
- dns9.hichina
          weblesson
C:\Documents and Settings\lyz>nslookup www.weblesson  202.112.0.44
*** Can't find server name for address 202.112.0.44: Query refused
Server:  UnKnown
Address:  202.112.0.44
Name:    www.weblesson
Served by:
- dns10.hichina
          weblesson
- dns9.hichina
          weblesson
C:\Documents and Settings\lyz>nslookup www.weblesson  202.96.64.68
Server:  ns.lnpta
Address:  202.96.64.68
Non-authoritative answer:
Name:    www.weblesson
Addresses:  121.199.253.180, 203.171.231.2
C:\Documents and Settings\lyz>nslookup www.weblesson ns9.hichian
*** Can't find server address for 'ns9.hichian':
*** Can't find server name for address 202.96.69.38: Server failed
Server:  ns.lnpta
Address:  202.96.64.68
Non-authoritative answer:
Name:    www.weblesson
Addresses:  121.199.253.180, 203.171.231.2
C:\Documents and Settings\lyz>nslookup www.weblesson dns9.hichian
DNS request timed out.
    timeout was 2 seconds.

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