Long night, no heart sleep, lying in bed reading "Focus hackers - attack methods and protective strategies" overset SSH / SSL. I found that the SecureCRT function you usually used is more than just a Telnet client. It can also establish an SSH channel, which can be securely accessed by the Internet. The Redhat Linux9 version is not started after the default installation, which is replaced by SSH, SecureShell. It monitors 22 ports. At the same time, the connection forwarding function is supported, with port forwarding features provided by SSH, and network access across the Internet is safe, and crossing the convenience through the firewall. ) Suppose there is a transit server Server public address is: 10.10.10 (intranet: 192.168.0.1), the intranet machine DB is: 192.168.0.2. Then connect to the Server through the SSH channel, and DB is connected via the Server. The configuration is as follows: Configuring port forwarding in PortForward: Enter port forwarding name, the local monitor port LocalPort (wait a Telnet Localhost LocalPort), remote IP (if not configured, connect the remote server native), remote port. After configuring it, connect Server. After success, you can connect to the DB machine by connecting the Telnet Localhost 2323 in this unit. To view the network, this machine is only a TCP connection to Server. The data used is transmitted by SSH connection. The telnet of the Internet is introduced above, similar to the service to access the intranet, as long as the mapping port is configured. Is it very convenient?
