一、一个研究AS级的拓扑结构的网站<br/><a href="http://www.caida.org/" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">www.caida.org</font><wbr></wbr></a><wbr></wbr><br/>在这个网站可以找到因特网AS级的拓扑资料和各种分析。<br/>他们分析的三个基本数据来源是:<br/>1,BGP <a href="http://www.routeviews.org/" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">http://www.routeviews.org/</font><wbr></wbr></a><wbr></wbr><br/>2,RouterTrace <a href="http://www.caida.org/tools/measurement/skitter/" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">http://www.caida.org/tools/measurement/skitter/</font><wbr></wbr></a><wbr></wbr><br/>3,Whois<br/>全球AS爆炸性增长的一个直观印象:<br/><a href="http://www.caida.org/analysis/topology/as_core_network/historical.xml" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">http://www.caida.org/analysis/to ... work/historical.xml</font><wbr></wbr></a><wbr></wbr><br/>二、AS在国内使用情况<br/>1、X通和XXX网(X通一般有几个)<br/>AS4134 CHINANET-BACKBONE No.31,Jin-rong Street<br/>AS9929 CNCNET-CN China Netcom Corp.<br/>AS4837 CHINA169-BACKBONE CNCGROUP China169 Backbone<br/>AS9800 UNICOM CHINA UNICOM<br/>AS9394 CRNET CHINA RAILWAY Internet(CRNET)<br/>AS9808 CMNET-GD Guangdong Mobile Communication Co.Ltd.<br/>AS4808 CNCGROUP IP network China169 Beijing<br/>AS4538 ERX-CERNET-BKB China Education and Research Network Center<br/>AS9306 CIECC-AS-AP China International Electronic Commerce Center<br/>AS4799 CHINA169-JT CNCGROUP Jitong IP network<br/>AS7497 CSTNET-AS-AP Computer Network Information Center<br/>......<br/><br/>2、城域网中<br/>AS17623 CNCGROUP-SZ CNCGROUP IP network of ShenZhen region MAN network<br/>AS17816 CHINA169-GZ CNCGROUP IP network China169 Guangzhou MAN<br/>......<br/>比较典型的是在北京,上海,广州的169MAN(是否是为了改造169而引入的?)。<br/>当然使用AS跑BGP能很好适应多中心,多出口的城域网拓扑结构。<br/>3、IDC<br/>是否与多个AS互联应该是衡量因特网数据中心优劣的重要指标。<br/>AS4816 CHINANET-IDC-GD China Telecom (Group)<br/>AS23724 CHINANET-IDC-BJ-AP IDC, China Telecommunications Corporation<br/>AS4815 CHINANET-IDC-SH China Telecom (Group)<br/>AS4835 CHINANET-IDC-SN China Telecom (Group)<br/>4、ISP<br/>AS9803 JINGXUN Beijing Jingxun Public Information Technology Co., Ltd (263)<br/>...<br/>5、适应电信分拆而出现的(真的吗?俺的臆测!)<br/>中国电信北方九省的AS号<br/>AS17785 CHINATELECOM-HA-AS-AP asn for Henan Provincial Net of CT<br/>AS17896 CHINATELECOM-JL-AS-AP asn for Jilin Provincial Net of CT<br/>AS17923 CHINATELECOM-NMG-AS-AP asn for Neimenggu Provincial Net of CT<br/>AS17897 CHINATELECOM-HLJ-AS-AP asn for Heilongjiang Provincial Net of CT<br/>AS17883 CHINATELECOM-SX-AS-AP asn for Shanxi Provincial Net of CT<br/>AS17799 CHINATELECOM-LN-AS-AP asn for Liaoning Provincial Net of CT<br/>AS17672 CHINATELECOM-HE-AS-AP asn for Hebei Provincial Net of CT<br/>AS17638 CHINATELECOM-TJ-AS-AP ASN for TIANJIN Provincial Net of CT<br/>AS17633 CHINATELECOM-SD-AS-AP ASN for Shandong Provincial Net of CT<br/><br/>网通通过兼并也收罗了一批AS,是不是联通如果被分拆也会出现一大批AS啊。<br/>6、保留AS号段<br/>这在国内几大电信营运商的省级网络内普遍使用(一般规划中会给省级网络分配有一个或几个AS号,并在网络边缘针对保留AS号段进行控制)。对应它们的网络往往也是多中心,多出口的.<br/>7、IXP/NAP<br/>AS4847 CNIX-AP China Networks Inter-Exchange<br/>AS4839 CERNAP2-CN NAP2 at CERNET located in Shanghai<br/>AS4840 CERNAP3-CN NAP3 at CERNET located in Guangzhou<br/>8、<font color="#ff0000" style="LINE-HEIGHT: 1.3em;">CN2</font><wbr></wbr><br/>AS4809 CHINANET-CORE-WAN-CENTRAL<br/>9、广电系统<br/>具体信息见:<br/><a href="http://www.52network.com/forum/viewthread.php?tid=2606&extra=page%3D1" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">http://www.52network.com/forum/v ... &extra=page%3D1</font><wbr></wbr></a><wbr></wbr><br/>10、教育城域网<br/>AS9806 BJENET Beijing Educational Information Network Service Center Co., Ltd<br/>11、IPv6 Test Network<br/>AS23912 IPV6CJ-AS-AP China Japan Joint IPv6 Test Network<br/>AS9808 CMNET-GD Guangdong Mobile Communication Co.Ltd.<br/>使用下面的URL,你能从AS号上(限apnic分配的)获取更多信息。<br/><a href="http://www.apnic.net/apnic-bin/whois.pl" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">http://www.apnic.net/apnic-bin/whois.pl</font><wbr></wbr></a><wbr></wbr><br/>三、国内与国外的差距<br/>1、大学没有(CERNET中有几个AS,用于NAP和IPv6等)<br/>或许中国某所大学已经申请了自己的AS号,俺孤陋寡闻。<br/>现在中国的大学规模都很大(N个校区),一般也是接几个ISP,使用的网络设备都是超越潮流,(大多数学校IP地址可怜除外)应该完全具有使用独立AS的条件了(这样也可以提高相关专业教师和学生的素质<wbr></wbr><a href="http://www.52network.com/forum/images/smilies/cool.gif" target="_blank"><img height="17" src="http://www.52network.com/forum/images/smilies/cool.gif" width="17" border="0" alt=""/></a><wbr></wbr>)。<br/>看看国外大学使用Zebra一样跑BGP,我们使用的Cisco设备倒是整得漏洞满天飞。<br/>University of Oregon Route Views Project <br/><a href="http://www.routeviews.org/" target="_blank"><font color="#656d77" style="LINE-HEIGHT: 1.3em;">http://www.routeviews.org/</font><wbr></wbr></a><wbr></wbr><br/>2、国内知名公司几乎没有<br/>进入前500强的中国公司除了电信营运商外,极少有AS。<br/>AS23848 CNNIC-PAIG-AP PING AN INSURANCE (GROUP) OF CHINA ,LTD. 平安保险<br/>国外一些大公司的AS号<br/>AS4983 INTEL-SC-AS - Intel Corporation<br/>AS8070 MICROSOFT-CORP---MSN-AS-BLOCK - Microsoft Corp<br/>...<br/>(俺一没IP段,二没国际化,还要考虑每年的财务报表,不整!)<br/><br/>四、个人的一些疑问<br/>1、面对电信的分拆是不是其他X通不能稳坐钓鱼台,需要不断调整NAP处的路由策略,比如针对网通的变化?<br/>2、随着中国电信分拆和AS使用增多时,在省一级建立IXP/NAP的时机什么时候会成熟?<br/>或许要等到IPv6(现在已经运行的一些IPv6大都使用原有AS号)和*通在省内改用非保留AS号。当然还要发挥政策的作用。<br/>3、使用AS是否能更好发挥教育城域网的作用。<br/>这对大家都是个机会啊。<br/>4.是不发现从AS入手,结合RouterTrace和Whoisa探索一个特定ISP的内部网络拓扑是很有效的方法。<br/>记得CIT中最开始就是要求把握拓扑吧。这应该是修炼CIT一个好方法。<br/><a href="http://www.cidr-report.org/cgi-bin/as-report?as=ASXXXX" target="_blank"><wbr></wbr></a><wbr></wbr><br/><br/>AS4837 CHINA169-BACKBONE CNCGROUP China169 Backbone<br/>AS17638 CHINATELECOM-TJ-AS-AP ASN for TIANJIN Provincial Net of CT<br/>AS9800 UNICOM CHINA UNICOM<br/>AS9929 CNCNET-CN China Netcom Corp.<br/>AS17623 CNCGROUP-SZ CNCGROUP IP network of ShenZhen region MAN network<br/>AS17816 CHINA169-GZ CNCGROUP IP network China169 Guangzhou MAN<br/>AS9389 Greatwall Net<br/>AS17638 CHINATELECOM-TJ-AS-AP ASN for TIANJIN Provincial Net of CT<br/>AS9306 CIECC-AS-AP China International Electronic Commerce Center<br/>AS4799 CHINA169-JT CNCGROUP Jitong IP network<br/>AS4134 CHINANET-BACKBONE No.31,Jin-rong Street<br/>AS7497 CSTNET-AS-AP Computer Network Information Center<br/>AS4789 CERNAP1-CN NAP1 at CERNET<br/>AS9808 CMNET-GD Guangdong Mobile Communication Co.Ltd.<br/>AS9800 UNICOM CHINA UNICOM<br/>AS4808 CNCGROUP IP network China169 Beijing<br/>Warnning!<wbr></wbr><a href="http://www.52network.com/forum/images/smilies/cool.gif" target="_blank"><img height="17" src="http://www.52network.com/forum/images/smilies/cool.gif" width="17" border="0" alt=""/></a><wbr></wbr><br/>If you know I get these infomation from back door in some backbone nework,You must check your network,rebuild security strategy.<br/>