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从sina.sohu的 dig可以看出明显不是chinacache的CDN ,应该是人家自己的dns view集群设备,
通过view来确定IP的职能访问。
ns1.sina.com.cn
ns2.sina.com.cn
ns3.sina.com.cn
3台 dns server
应该是一主 2从吧,应该分布在不同的区域内。
- [root@weblily ~]# dig sports.sohu.com
- ; <<>> DiG 9.2.4 <<>> sports.sohu.com
- ;; global options: printcmd
- ;; Got answer:
- ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15955
- ;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0
- ;; QUESTION SECTION:
- ;sports.sohu.com. IN A
- ;; ANSWER SECTION:
- sports.sohu.com. 560 IN CNAME d2.a.sohu.com.
- d2.a.sohu.com. 9 IN CNAME pgcnczjt02.a.sohu.com.
- pgcnczjt02.a.sohu.com. 90 IN A 61.135.150.102
- pgcnczjt02.a.sohu.com. 90 IN A 61.135.150.52
- pgcnczjt02.a.sohu.com. 90 IN A 61.135.150.65
- pgcnczjt02.a.sohu.com. 90 IN A 61.135.150.74
- pgcnczjt02.a.sohu.com. 90 IN A 61.135.150.79
- pgcnczjt02.a.sohu.com. 90 IN A 61.135.150.97
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这些A记录,应该是前段的squid的集群IP地址,随便丢个IP出来访问,都是出现squid deny的 error
- Generated Wed, 31 Dec 2008 08:45:11 GMT by xd33-74.HP08040013.sina.com.cn (squid/2.6.STABLE13)
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- [root@weblily ~]# curl -I [url]www.sina.com.cn[/url]
- HTTP/1.0 200 OK
- Date: Wed, 31 Dec 2008 08:44:01 GMT
- Server: Apache/2.0.63 (Unix)
- Last-Modified: Wed, 31 Dec 2008 08:43:16 GMT
- Accept-Ranges: bytes
- X-Powered-By: mod_xlayout_jh/0.0.1vhs.markII.remix
- Cache-Control: max-age=60
- Expires: Wed, 31 Dec 2008 08:45:01 GMT
- Vary: Accept-Encoding
- X-UA-Compatible: IE=EmulateIE7
- Content-Type: text/html
- Age: 48
- Content-Length: 440664
- X-Cache: HIT from xd33-71.HP08040010.sina.com.cn
- Via: 1.0 xd33-71.HP08040010.sina.com.cn:80 (squid/2.6.STABLE13)
- Connection: close
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