Multi-Wan port router technology and its application in routing technology

With the increase in user Network application requirements, only NAT is not enough. In particular, users of the network security and other guarantee network safe and smooth operation of the function requirements are very urgent, broadband router design more and more complex, including firewall, DMZ, virtual server and many other functions, broadband router embarked on a multi-functional road, a variety of Soho router products emerged.

Now, another development trend is more obvious, the broadband router gradually from the initial Soho, home applications, by the vast number of enterprise users to choose as a network of medium-scale networking equipment, and in this environment, enterprise users to broadband routers put forward more complex functional requirements: such as faster, The security is stronger, can manage, the application pattern is rich and colorful. Therefore, the broadband router presents a variety of development momentum, a wide range of different performance products constitute a high-speed development of the SMB broadband router market. 3lian footage

Among them, a broadband router with multiple WANs is one such characteristic SMB product family. It has turned "one-to-many" broadband access into a "many-to-many" way to fully satisfy the desire of enterprise users to have more bandwidth without too much cost. This router allows users to share 2-4 of lines of broadband outside a LAN, without having to divide the internal network into separate sections by the number of WAN ports. In fact, its working mechanism is to the local area network transmission request data, in order to set the load balancing strategy, the average distribution to different broadband exports, and the requested data from the export back, so as to achieve intelligent information dynamic streaming. Because the LAN's session request is dispersed, continuously, after the allocation, the macroscopic looks like is expands the entire LAN the export bandwidth, has played the function which the bandwidth multiplies.

Multi-Wan port broadband routers are technically more complex and require a high amount of hardware processing power. Multi-Wan port processing is not a standard network protocol, there is no specification to follow, but a implementation strategy. Therefore, due to technical capabilities and field debugging environment, the different manufacturers of similar products, the difference is very large. Because to complete the packet high-speed distribution and recovery, the complex algorithm must be continuously optimized to achieve accurate and efficient, adaptable to the purpose of the design engineer network embedded software requirements is very high.

At the same time, multiple WAN port routers must adopt high speed CPU and large capacity memory, otherwise it is not competent to resolve the heavy task of each IP packet. Low-speed CPU processing capacity is not enough, will cause the collapse of the internal software system, routers have to frequently panic. According to practical results analysis, the use of the rate of more than Mips CPU routers, can basically adapt to the work of multiple WAN port router requirements, and the use of less than 150M CPU router, in a veryThe probability of a panic failure in many environments is extremely high, so the use of small materials, it seems a bit stretched.

The load-balancing mechanism for multiple-WAN port routers is not a single WAN, but also the most specific application mode for multiple WANs. There are three common load-balancing mechanisms:

1. Session

The system takes the number of sessions (conversations) as a count unit, and all sessions are divided evenly into all enabled WAN ports by 1:1 percentage.

2. Weight round robin

is similar to session mode, but the proportion of sessions can be adjusted. The

3 traffic

System automatically looks for the least traffic wan to send and receive data. The

also has a manually set load Balancing method--wan Port path designation, which is the 4th load Balancing mechanism, or load allocation mechanism. This is a specific feature in the "Hin" multi-wan router. It is mainly aimed at education network, industry-specific network users, according to the needs of the selective use of WAN exports, such as cernet and telecommunications public network exports shared education network, military network and external ADSL applications, such as the use of the WAN path to specify the load distribution mechanism. Www.3lian.com

In addition, multiple WAN port routers can also play the role of line backup, once a broadband line failure, the other line will assume all the user's data request, so that the entire network system has been strengthened, Avoid the disastrous consequences of the paralysis caused by network exports. Especially for the operation of Internet cafes, line failures not only cause money loss, the serious consequences of customer churn will be the Internet café owners can not afford. Similarly, for some of the more information-based enterprises, the reliance on the network system is heavy, Office business Network has a moment can not leave, the lack of backup network system also has huge hidden dangers. Therefore, choosing a multiple WAN port router is a reflection of the manager's wise precautions.

Because of the existence of a wide range of broadband access and the formation of competitive structure of telecom operators, optical fiber, ADSL, CABLE MODEM, five types of lines, ISDN and other broadband means coexist, even in ADSL, there will be telecommunications, Netcom, railcom and many other services provided, Therefore, in the practical application can be seen, smart users at the same time selected several services, from the consideration of the charges on the one hand, and worry about the quality of broadband services, from the network security backup considerations are more important on the other side factors. As a result, multiple WAN port routers are very useful.