Analysis on port ing instance of mercury MR804

The port ing of the MR804 port mentioned here is not an I/O port of computer hardware, but a concept of software form. I hope you will have a systematic understanding after reading this article. A server can provide a variety of external services. For example, a server can be a WEB server, an FTP server, or an email server. Why can a single server provide so many services at the same time?

One of the major aspects is that various services provide different services by using different ports, such as using port 80 for WEB and port 21 for FTP. In this way, computers communicate with the outside world through different ports. The port we refer to here is not a physical port, but a port in the TCP/IP protocol. It is a logical port.

Analysis of port ing instance of mercury MR804:

To connect a computer on the Intranet to the Internet, port ing is required. Port ing is divided into dynamic and static.

Dynamic mercury MR804 port ing:

A computer in the Intranet will send packets to the NAT gateway to access xinlang. the packet header includes the IP address, port, and local IP address and port of the other party (I .e. xinlang network, the NAT gateway will replace the local IP address and port with its own public IP address and an unused port, and write down the ing relationship for future packet forwarding. Then, send the data to Sina. Upon receiving the data, Sina responds and sends the data to the unused port of the NAT Gateway. Then, the NAT Gateway forwards the data to the computer on the Intranet, implement communication between the Intranet and the Internet. when the connection is closed, the NAT Gateway releases the port allocated to the connection so that future connections can continue to be used. Dynamic port ing is actually how NAT Gateway works.

Static mercury MR804 port ing:

It is to open a fixed port on the NAT gateway, and then set which IP address and port the port receives to forward data to the Intranet. no matter whether the port is connected or not, this ing relationship will always exist. You can allow the public network to actively access a computer on the Intranet.

Mercury MR804 Port ing Port Mapping ):

If you are a broadband access user such as ADSL, MODEM, or optical fiber, you want to build a server or WEB site in your company or Internet cafe and want Internet users to access your server, then you will encounter port ing problems. Generally, a vro has a firewall function. Internet users can only access the WAN port of your vro (the telephone line port connected to ADSL or the Internet port connected to broadband), but cannot access internal servers.

To allow Internet users to access your server, you must configure a forwarding configuration on the vro, that is, port ing, so that after the requests sent by Internet users reach the vro, then, it is forwarded to the server or WEB site you have created. This is port ing. Because different vro manufacturers have different function names, some are virtual servers and some are called NAT to set port ing.

The author's plain explanation:

Port ing is to map a port of the Public IP address on your route to a machine in the LAN. When a user accesses this port of your public IP address, the router automatically requests access to the extension of the IP address corresponding to the LAN.

Security Questions about enabling port ing of mercury MR804:

After setting port ing for the MR804 port, Internet users can bypass the router firewall to access your server and control your host by attacking vulnerabilities on your server, therefore, after enabling port ing, it is necessary to mount a firewall on your server to ensure security.