interior network.

Because of a series of shortages, rebounding connection Trojan is born. Such as domestic software: grey pigeon.
Rebounding connection Trojan starts a port on our machines, and let Trojan infectors connect us to get the information. No matter how their IP addresses change, it’s of no use.

If our own machines’ IP addresses change, then they couldn’t find our machines, neither to get our information.
However, this is not a problem. Since the popularity of www, there’re domains. In the network, we can find out our own IP address by visiting the domain, such as www.baidu.com , its IP is 23.181.38.4. If baidu’s IP address changes to 12.11.22.3, as long as the domain name keeps the same, no matter how the IP address changes, it could find you out. Even machines in interior network, we could also get the information.

Summarization:

1 port is enabled in local, they could connect us, even the machines inside or outside the network.

The most headache thing about Rebounding connection Trojan is that the user is of interior network state. When come to the issue: why it’s a headache, please memorize the principle of positive-orientation connection Trojan. Others could not directly visit the machines inside router(I mean the interior network).