Show in privileged mode
run quickly
take a look
Such as e0 port
Just use it in global mode.
connect
e
Enter interface mode
Internet Protocol (short for Internet Protocol)
spirit
inside
This command specifies the internal interface.
The external interface is the same.
Just change the command to ip.
spirit
Outside
View from a height or a distance
Use ip
That is, the following ip is converted.
Specific protocol
Is to convert a specific protocol.
For example, your 2 1.
That is, when you can freely access ftp, you will switch.