今天公司的网络又断了。 可是 QQ 能用， 怀疑是 DNS 问题。

nslookup 看到如下结果：

> www.sina.com.cn
Server:         202.96.209.5
Address:        202.96.209.5#53

Non-authoritative answer:
www.sina.com.cn canonical name = jupiter.sina.com.cn.
jupiter.sina.com.cn     canonical name = taurus.sina.com.cn.
Name:   taurus.sina.com.cn
Address: 61.172.201.225
Name:   taurus.sina.com.cn
Address: 61.172.201.226
Name:   taurus.sina.com.cn
Address: 61.172.201.227
Name:   taurus.sina.com.cn
Address: 61.172.201.228
Name:   taurus.sina.com.cn
Address: 61.172.201.229
Name:   taurus.sina.com.cn
Address: 61.172.201.230
Name:   taurus.sina.com.cn
Address: 61.172.201.231
Name:   taurus.sina.com.cn
Address: 61.172.201.232
Name:   taurus.sina.com.cn
Address: 61.172.201.233
Name:   taurus.sina.com.cn
Address: 61.172.201.234
Name:   taurus.sina.com.cn
Address: 61.172.201.235
Name:   taurus.sina.com.cn
Address: 61.172.201.239
Name:   taurus.sina.com.cn
Address: 61.172.201.240
Name:   taurus.sina.com.cn
Address: 61.172.201.9
Name:   taurus.sina.com.cn
Address: 61.172.201.10
Name:   taurus.sina.com.cn
Address: 61.172.201.224

随便挑个 IP 地址访问，可以看到这样的提示：

ERROR

The requested URL could not be retrieved

---

While trying to retrieve the URL:
http://61.172.201.231/

The following error was encountered:

• 
  Access Denied.
  

  Access control configuration prevents your request from
  being allowed at this time. Please contact your service provider if
  you feel this is incorrect.

Your cache administrator is webmaster.

---

Generated Thu, 21 Jul 2005 01:21:56 GMT by sqsh-232.sina.com.cn (squid/2.5.STABLE4)

因此可以知道新浪也采用　squid 开放源码缓冲服务器来提升速度。　

posted by albertxu at 9:23 am & filed under 雕虫小技 |