Expert guidance on how to identify true and false dual-line host

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Dual-line server is actually a server has two lines of telecommunications and netcom access, through the intelligent interpretation of the user's IP address, the realization of telecommunications users access to telecommunications lines, netcom users to access the Netcom line, so as to achieve the goal of rapid access nationwide. According to the different computer room access mode, dual-line service access is divided into single IP access, single network card dual IP access and dual network card dual IP A total of 3 types of access, which is the best single card dual IP access, respectively, to provide a telecom IP and netcom IP dual-line, multi-line technical results, the most critical problem has two, one is the use of the network card , IP mode of operation, the second is the intelligent resolution of the User IP address is stable and reliable.

First question:

1, dual network card dual IP dual-line: Early some of the computer room due to its own technology/equipment does not pass, unable to switch on the computer room router, can only use one server two network cards, two network cables are connected to the telecom/Netcom, this will lead to random fluctuations in server routing, and lead to user access when the speed is slow, or even completely inaccessible, This is already a backward way of being eliminated.

2, single IP dual-line: Single IP to achieve dual-line, this is the emerging routing technology, this IP does not belong to any telecommunications operators, when the resolution, automatically judge the visitor is that line, so that the IP to go that line to meet the needs of each line. However, single IP dual-line service is in the computer room router level according to the user line, switch the corresponding Telecom/Netcom line, because most of the two-line room is from the telecommunications, netcom to obtain IP address, no power to switch lines, resulting in the whole network can not achieve the purpose of fast, and some of the room has IP autonomous domain, but can not obtain from the telecommunications/ Netcom to obtain enough bandwidth, resulting in user access speed is not ideal.

3, single network card dual IP Intelligent dual-line: This way a bit similar to the above, but because the single NIC bound 2 IP, so you can obtain IP address from the telecom/Netcom, through the domain name Analysis Server for intelligent switching, so as to avoid the single IP dual-line weakness, the real realization of a full network of fast access.

There are some operators on the Internet to use Third-party ISP line to achieve the effect of double line, is the use of non-telecom non-netcom lines, such as: Mobile, Unicom. This line is connected to both the telecom and netcom speed is very good, the effect is similar to the real two-line, but after all, there is bandwidth constraints, small Web site is very good, large sites will not. So, everyone in the choice of time, can be as far as possible menu dual IP dual-line or Third-party ISP line, the effect is good.

No matter what kind of dual-line, both users and servers need to resolve the IP address to select the line, so IP address resolution technology, equipment and a perfect large address library is very important-the principle is that users visit the site first to the DNS server to query the IP address of this site, And the DNS server will determine whether the user is a telecommunications network or netcom Internet access? Is the telecommunications network to return to the telecommunications IP address, Netcom is the internet to return to the network IP address, so that the realization of intelligent judgment, intelligent recognition purposes.

Because of this analytical technology has a certain threshold, so not every operator can be implemented, and only the use of intelligent DNS resolution of the two-line host can be said to be true dual-line services.