How does the server solve the obstacles of North South mutual visits? How does server trust solve the obstacles of North South mutual access? Several ways and methods to solve the obstacles of North South mutual access under server hosting Today, Micronet Bian Xiao introduces this problem in detail.
When the host users of the server encounter users from different regions in the north and south, there will be data transmission delays, so a multi line solution is very necessary.
1、 Dual IP dual line implementation mode
The realization of dual IP and dual line is to install two network cards on a server that connects the telecommunication network cable and the Netcom network cable, set one Netcom IP and one telecommunication IP, and then a server has two IP addresses. The routing table of Netcom or Telecom needs to be added in the server to realize the access of different lines between Netcom users and Telecom users. Dual IP and dual line have two common modes:
1. The administrator sets two links of different IP addresses on the website. Netcom users click Netcom IP to access the server, and telecom users click Telecom IP to access.
2. Bind 9 (DNS server software) is used to return different server IPs for different IP addresses, so that Netcom users can return Netcom IPs when requesting domain names, and Telecom users can return Telecom IPs when requesting domain names. This method is some intelligent DNS solutions proposed by IDC.
This dual IP dual line access mode improves the access speed of Netcom and telecom users to a certain extent, but the disadvantage is that the server accesses dual network cards, and the routing table must be set in the server, which increases the maintenance difficulty of ordinary users. All data packets need to be routed on the server and then sent to different network cards. When the traffic is heavy, the server takes up a lot of resources. This solution is relatively simple to solve the double line problem, but the disadvantage is that it is not stable enough and the maintenance is slightly complicated. This scheme is generally adopted by small websites or game services.
2、 Single IP dual line
The common single IP dual line refers to the dual line technology of setting IP on the server. The IP is Netcom IP or Telecom IP, which is realized through the telecom network or Netcom network by setting data packets through the routing equipment. This solution can also improve the access speed between Netcom users and telecom users, and solve the problem that dual IP and dual line need to set routes in the server. However, because the IP address is the IP address of Netcom or Telecom, the access user will not automatically identify the best route when sending the request packet. Therefore, this solution can only be said to be a half double line technical solution and a transition solution. This scheme is generally a compromise scheme adopted by single line ISP service providers during the transition to dual line ISP service providers. This scheme can be used for general small and medium-sized websites. At present, this technology is used in Zhangjiang computer room in Shanghai, and the price is competitive.
3、 Double line realized by CDN
CDN (Content Delivery Network) Internet content distribution network is a multi server subnet hosting plus intelligent domain name DNS, that is, the server is provided by the CDN service provider, placed on different network nodes, automatically captures the data of the user's source server through the buffer program, and then caches it on the servers of different network segment nodes. In addition, with the branch network resolution function of the intelligent DNS server, different network users can access the website in the nearest network segment, thus avoiding the impact of network problems on the website access speed. At present, most CDN technologies are mature in dealing with static websites, but they are not mature for websites with strong interactivity, such as full dynamic pages. The implementation cost is also high, and the maintenance workload increases. This scheme is generally adopted by large and medium-sized portal websites, and currently IDC companies also provide this service.
4、 Single IP dual line implemented by BGP protocol
This scheme maps the IP of one line directly to the IP of another line through BGP protocol, and automatically selects the best route when users access, so that users will not have slow delay when passing through different ISPs. What is BGP? BGP (Border Gateway Protocol) is mainly used for interconnection between Internet ASs (autonomous systems). Its main function is to control route propagation and select the best route. Both China Netcom and China Telecom have ATM numbers, and most of China's major network operators are interconnected with their ATM numbers through the BGP protocol. In order to implement the dual line scheme, you need to apply for the IDC's own IP address segment and AS number at CNNIC, and then broadcast the IP address to Netcom, Telecom and other network operators through the BGP protocol. After interconnection with BGP protocol, all backbone routing devices of Netcom and Telecom will determine the best route to the IP segment of IDC machine room to ensure high-speed access of Netcom and Telecom users.
The scheme has the following advantages:
1. The server only needs to set one IP address. The best access route is determined by the backbone router on the network according to the technical indicators such as the number of route hops. It will not occupy any system resources of the server. The server's upstream route and downstream route can choose the best path to truly achieve high-speed single IP two-wire access.
2. Because the BGP protocol has the characteristics of redundant backup and loop elimination, when the IDC service provider has multiple BGP interconnection lines, it can realize mutual backup of routes. When one line fails, the route will automatically switch to other lines.
3. The use of BGP protocol can also make the network have strong scalability, make the IDC network interconnected with other operators, and easily realize single IP multi line, so that users of all interconnected operators can quickly access. This is incomparable with dual IP and dual line.
Although BGP is the best solution, this solution requires IDC providers to invest heavily in equipment and bandwidth, and the technology is complex. Currently, this solution is only used by professional IDC service providers with strong strength.
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