双线机房
双线机房双线机房是由于国内两大网络(电信和网通)之间的互联互通问题。导致电信用户访问网通网站或网通用户访问电信网站很慢，为解决这个问题，就产生了双线机房,双线服务器,双线服务器托管,双线服务器租用服务。双线机房实际是一个机房有电信/网通 两条线路接入。通过双线机房内部路由器设置，通过BGP自动路由的分析，实现电信用户访问电信线路，网通用户访问网通线路，这样实现电信网通均可以快速访问 。
很多上网的朋友一定留心到一个问题，当我们下载东西的时候，有的线会很快，有的线则不然，纵使使用迅雷，BT等工具都会很慢，很多网游都分别提供电信，网通的下载地点－－问题出来了？为什么会出现这种状况？
原因很明显，自从电信网通分拆之后，双方产生互连接点，而这个接点的带宽正是影响双方互访速率的关键所在！所以当电信用户访问网通接入网站时速度很慢，网通用户也是如此。
那么，很明显，当一个用户访问某个站点速度很慢时，他都会投入一个同类但速度相对较快的网站，我想，这是每一位站长都不愿看到的。
那是不是就没有办法解决这个问题呢？当然不是！双线接入极好的解决了这一问题。
所谓的双线接入其实分了三种情况：
一、假双线
电信网通网站镜像，实际是在分别在电信网通各自都有一个网站，但这样导致：
A: 成本高 一套网站要购买2个空间。
B: 维护成本高 更新一个网站要同时更新电信、网通2个空间上的数据。
有一些程序不适用对有一些网站程序，会导致数据不同步，会出现很大问题。例如电信用户在电信网站上传的图片，网通用户看不到等。
二、普通双线
是在网站页面建 "电信站" "网通站" 两个连接，但客户访问网站的时候几乎不会去留意这样的选择，或者客户根本没有耐心访问，您的网站(打开很慢) 这样会导致您的客户丢失。
三、智能双线
全网路由或者双线接入是一项网络接入的链路层技术。是指服务器所在的数据中心机房同时拥有网通与电信等多种网络出口，在机房的上层交换机上设置了全网路由技术，使服务器每次向外部网络连接时可以自动被分配到最快速的链路上。从而实现了电信与网通用户都可以同时高速访问。
但此项技术进能够解决数据输出时的互联互通问题，但从您的电脑终端向服务器发起的连接通常是无法自动选择链路方式的，因此您上传数据时的速度仍然会受到网络互联问题的影响。但是通常我们制作网站仅需要非常少量的上传，而绝大多数是将网页内容提供给浏览者下载。
除了全网路由（双线接入）外，CDN技术也可以实现各网络快速访问。但CDN技术除了会遇到上传慢，更麻烦的是内容缓存与同步周期限制，是的您的内容不能够及时发布，用户浏览到的永远是相对滞后的信息。
因此，双线接入也就成了目前网站解决互联互通问题的最佳解决方案。 所谓双线接入，就是从国家核心接点单独引入一条连接电信网通的线路，这条线路消除了接点桥，使互访变得简单快捷，无论南北，你的网站都会被高速访问。一般国家级政府网站都是使用了如何选择好的双线机房
众所周知，南方电信与北方网通的互联网通信存在瓶颈，且不去说具体是什么原因造成的， 但这确实给互联网的应用造成了很大的障碍。所以，从服务器以及IDC运营的角度来说，出现了很多双线路机房，通过部署电信、网通双线路，满足用户对双线路的实际使用需求。
谈到双线机房，相信大家在搜索引擎上见了不少，到处都是双线，多线,就像逛街购物一样，"五花八门"让你不知从何选择。如今的客户喜欢跟潮流，就像葛优做的广告，吃饭我选择那里人多去那里，最后形成市场不协调。
下面我们就来看一下如何选择好的双线机房？
第一、在选择双线机房时，一定要先了解一下机房的运营历史；
第二、得看运营商口碑和品牌；
第三、运营商有没有电信经营许可证；
第四、机房典型客户有多少；
第五、了解机房总带宽，服务质量，技术实力，企业动态和响应时间
什么是真正的双线机房
由于国内两大网络(电信和网通)之间的互联互通问题. 导致电信用户访问网通网站或网通用户访问电信网站很慢, 为解决这个问
题, 先后有多种方案
A 给网站分别做电信站/网通站镜像:这种实际是用户分别在电信和网通租用托管1台服务器.两个服务器数据相同. 这样做成本高,
并且维护非常不方便. 数据无法保持实时同步.
B CDN(网站加速) : 这种方案是有一台服务器在电信/网通 缓存了 用户网站数据. 能够有一定的作用.但只对静态页面有效,对动
态页面无效.
C 双线主机.双线托管实际是一个机房有电信/网通 两条线路接入.通过机房内部路由器设置. 实现电信用户访问电信线路.网通用
户访问网通线路. 这样实现电信网通均可以快速访问,.
D 智能双线主机:智能双线主机是在双线服务上的进一步优化. 双线托管中效果最好的是双IP的托管方式.也就是一个服务器同时
分配电信和网通各一个IP地址. 然后让电信用户访问电信IP地址.网通用户访问网通IP地址. 这种双线的效果最好.
各种方案对比:
托管成本 维护性 使用效果
电信网通镜像 昂贵,需要同时在电信和网通托管服务器 不方便,需要同时维护电信/网通2个服务器.并保证数据同步. 数据同步麻
烦.
CDN 比较昂贵, 同样需要托管多台服务器. 一台服务器可以给多个网站提供镜像加速 方便, 用一定的延迟,可以对静态内容加速,
但对动态程序无法加速
单IP双线主机 便宜,只需一台服务器 方便 有一定的效果,但实际测试效果不是最好
双IP双线主机 便宜,只需一台服务器 方便 效果最好,实现电信用户访问电信IP地址/网通用户访问网通IP.
只有实现双IP双线+智能解析. 才算是真正的完全的彻底的双线解决方案
Two-roomTwo-room is due to two major domestic networks (Telecom and Netcom) interoperability issues between. Lead to telecommunications users to access websites or Netcom Netcom users access to telecommunications web site very slow, in order to solve this problem, we have had a two-room, two-server, two-server hosting, server rental service lane. Two-room is a room actually has Telecom / Netcom two line access. Two-room through the internal router settings, through the analysis of BGP routing automatically to achieve user access to telecommunications telecommunications lines, Netcom Netcom user access lines, so that the telecommunications network can realize quick access.
A lot of Internet friends must pay attention to a problem, when we download anything, some lines will soon, and some lines are not, even though the use of Thunder, BT and other tools will be very slow, many online games are provided, respectively, Telecom, Netcom download sites - the problem out? Why is there such a situation?
The reason is obvious, since the spin-off telecommunications Netcom, the two sides have a point of interconnection, and this contact is the impact of the bandwidth of the two sides exchange visits key rate! Therefore, when users access Netcom telecom access site slowly, Netcom users is also true.
Well, obviously, when a user visits a site very slow, he will put a similar but relatively fast speed of the website, I think this is every station do not want to see.
That is not no way to solve this problem? Of course not! Two-lane access to an excellent solution to this problem.
The so-called two-lane access are actually three situations:
First, false lane
Telecom Netcom mirror site, was in their respective telecommunications Netcom has a website, but this has led to:
A: the high cost of a site to buy two of space.
B: maintenance of the high cost of updating a web site should be updated at the same time Telecom, Netcom, two of the data space.
Has some of the procedures do not apply to have some websites procedures, will lead to data synchronization, will be big problems. Such as telecommunications customers in the telecommunications web site to upload pictures, users can not see, such as Netcom.
Second, ordinary two-lane
Is built on the site page "Telecommunications Station" "Network Station" to connect the two, but when customers visit the Web site almost not going to pay attention to such a choice, there is no patience or customers visit your website (open very slowly) it will lead to the loss of your customers.
Third, intelligent two -
Network-wide or two-lane access from a network access link layer technology. Refers to the server where the data center room also has a variety of network and telecommunications network, such as exports, the upper switch in the room to set up the entire network by the technology, so that each server connected to the external network can automatically be assigned to one of the fastest link. In order to realize the Telecom and Netcom users can at the same time high-speed access.
However, this technology into the data output can be solved at the time of interoperability issues, but your computer terminal to initiate the connection to the server usually can not automatically select the link the way, so when you upload data speed, will be the issue of network interconnection impact. But usually we only need to make the site a very small amount of upload, while the vast majority of Web content will be available to viewers to download.
Apart from the whole network by the (two-lane access) outside, CDN technology can realize fast access to the network. However, apart from CDN technology will encounter slow upload, but the trouble is that the contents of the cache and synchronization cycle limitation of your content can not be timely released, users browse to Forever is a relative lag of information.
Therefore, the two-lane access to resolve the current site will become the best interoperability solutions. The so-called two-lane access, that is separate from the national introduction of the core contact Netcom's a bridge to connect the telecommunications lines, this route to eliminate the contact bridge, becomes simple and quick to make visits, both the North and the South, your site will be high-speed access. National government web sites in general are used to choose a good two-room
As we all know, Southern Telecom and Times Online's Internet communications bottlenecks, not to say what the specific causes, but it applied to the Internet has posed a great obstacle. Therefore, from the server as well as the IDC operational point of view, there were a lot of double-line engine room, through the deployment of Telecom, Netcom, two-line, double line to meet the user's actual use of the demand.
On the two-room, I believe that in the U.S. met with a lot of search engines everywhere two-lane, multi-line, just like shopping, "a variety" I do not know where you choose. Today, customers like the tide, like Ge You to do the advertising, where people eat more than I chose to go there, and finally the formation of non-conforming market.
Here we look at how to choose a good two-room?
First, in the choice of two-room, we must first look at the engine room of the operating history;
Secondly, operators have to look and brand reputation;
Third, telecom operators have no license;
Fourth, the room has the typical number of customers;
Fifth, the understanding of the engine room of total bandwidth, service quality, technological strength, business dynamics and response time
What is the true two-room
Because the two networks (Telecom and Netcom) interoperability issues between. Lead to telecommunications users to access websites or Netcom Netcom users access to telecommunications web site very slow, in order to resolve this question
Title, there have been a variety of programs
A site, respectively, to make telecommunications station / CNC mirror Station: This is actually the user, respectively, in the telecommunications and Netcom rented one hosting servers. Data same two servers. To do so costs are high,
And maintenance is very inconvenient. Data can not maintain real-time synchronization.
B CDN (site to speed up): This program is has a server in the telecom / network data cache the user site. To have a certain role. But only on the static pages as effective in the dynamic
State invalid page.
C two-host. Two-hosting is a real engine room has Telecom / Netcom two line access. Internal router settings through the room. The realization of telecommunications users to access telecommunications lines. Netcom by
Households visit Netcom line. This telecommunications network can realize quick access.
D smart two-Host: Smart host is on two-lane two-way service was further optimized. Trusteeship in the two-best dual-mode IP hosting. That is, a server at the same time
Telecom and Netcom, the allocation of an IP address. And then let users access Telecom Telecom IP address. Netcom Netcom users access to IP addresses. This two-lane best.
Compare a variety of programs:
Trusteeship of the use of cost-effectiveness of maintenance
Telecom Netcom mirror expensive, the need for telecommunications and network at the same time hosting server is not convenient, the need to safeguard the telecommunications / Netcom server 2. And to ensure data synchronization. Data synchronization Ma
Annoying.
CDN more expensive, the same need for hosting multiple servers. A server can be mirrored to multiple sites to accelerate the provision of convenient, with a certain degree of delay, can speed up static content,
However, the dynamic process can not be accelerated
Two-lane single IP host cheap, only one server to facilitate a certain degree of effect, but the effect of the actual test is not the best
Two-lane dual-IP host cheap, only one server to facilitate best realize telecommunications users to access telecommunications IP address / Netcom Netcom users access to IP.
Only two-lane dual-IP + intelligent analysis. Is the real two-way complete and thorough solution