#About this page
Here will explain "Port forward"
Do you know port forward？
What is a port?
What is a port forward?
IP address exhaustion problem.
Resolved "IP adress" exhaustion problem.
Risk of port forward
Summary
Here will explain "Port forward"
Do you know port forward？ What is a port? What is a port forward? IP address exhaustion problem. Resolved "IP adress" exhaustion problem. Risk of port forward Summary#Do you know port forward？
Everyone,do you know port forward? Before going to other explanations, what is port forward in the first place? Before going to other explanations, what is A in the first place? I will explain from there.
#What is port?
In the first place port is concept which plural was made to do communication. Oeiginallyone PC could only communication as one application.
There is too inconveient,make port that each application can communication, By numbering port and numbering application.Multiple applications can now communicate.
#What is a port forward?
The term "port forward"Associating "port number" with an application to communicate. Why does it have to open the port in the first place? Explanation of "NAT" and "IP address exhaustion" is necessary for that explanation.
#IP address exhaustion problem.
Initially, the IP address is like the address assigned when connecting to the net, but that address was allocated by the conventional method IPv4. This can only be assigned up to the 255 power of 4.4228250625 people (About 4.2 billion)TerminalsCan only be assigned to terminals. As the population of the Earth is nearly 7 billion, it is not enough due to the popularization of PCs and smart phones. That's where "NAT" appeared.
#Resolved "IP address" exhaustion problem.
This "NAT" is a technology to change local IP(private IP) given to each PC and smartphone to global IP. Internet is a network constructed using global IP address, but because it is a network constructed using private IP address in non-public network, when connecting to the Internet from that network, private IP address to global It is necessary to convert (NAT) to IP address. This solved the global IP exhaustion problem a little. At this time, a new method called IPv6 was newly born.
This method can allocate about 340×10^36 IP addresses which is very numerous compared to IPv4. With the introduction of these methods, the problem of "exhaustion of IP address" has been solved. Since IP address description is over, let's return to the risk of port opening.
#Risk of port forward
I think that you understood the port more than the above.It opens up that port and is subject to some risk.As we pass the number of the port to a third party (including friends), we use that number to allow third parties to put in their own terminal that will be the server. If someone with a malicious idea lurking within it,I hope that I can easily hack the terminal.
If you are using a server OS, security is also secure, but it is safe, but be careful if you are using ordinary consumer OS (windows 10, macOS etc). Please let me know as much as possible to teach port numbers other than trusted people.
#Summary
Do not forget to open the port and do not forget to close the port if you do not use it.
Try not to tell others yourself your global IP address.
As Kenji remarks in chat, let's do what you want to do after you understand what you are doing.
Do not forget to open the port and do not forget to close the port if you do not use it. Try not to tell others yourself your global IP address.As Kenji remarks in chat, let's do what you want to do after you understand what you are doing.
Let's look at future security on the next page.
