Use the NAT Function on the internet cafe Router

NAT is the most widely used function in Internet cafes. Generally, the operator provides one IP address to the Internet cafe, and there are a large number of PCs in the internet cafe. So many PCs need to access the Internet through this unique IP address, how can we achieve this?

The answer is NAT, that is, network IP address translation for Internet cafes.

When an internal PC accesses the Internet, a corresponding list is created inside the internet cafe router, the list contains information such as the internal PC, IP address, external IP address for access, internal IP port, access destination, and IP port, there is a list of mappings created on the vro. If the network link corresponding to this list has data communication, these lists will be retained in the internet cafe router. If there is no data communication, it also takes 20 to 50 seconds to disappear. These times can be set for RG-NBR series routers.

There are several network viruses that can send tens of thousands of consecutive connection requests to different IP addresses in a short time, in this way, the Internet cafe router needs to establish more than NAT links for this PC.

Because the NAT links on the internet cafe routers are limited, if they are all occupied by these viruses and other people access the network, because there is no NAT link resource, the network may be inaccessible, resulting in a disconnection. In fact, this is because all NAT resources are occupied by network viruses.

In this case, many Internet cafe routers provide the ability to set the maximum number of NAT links for the internal PC, and can uniformly set the maximum number of NAT links for the internal PC, you can also restrict each PC.

At the same time, these Internet cafe routers can also view the content of all NAT links to see which PC occupies the most NAT links, and the network virus also has some special ports, you can view the specific content of the NAT link and find out which PC has been poisoned.