Turn on or turn off debug function
Export vpn ca certificates
Import vpn ca certificates
Export log information to tftp server
Save current configuration parameters
Tftp IP-address get
{cfg|rootfs} file-name
Import configuration file or update firmware via tftp
Show current configuration of each function , if we
need to see all please using “show running ”
Set parameters
Add parameters
All the function parameters are set by commands
set and add, the difference is that set is for the
single parameter and add is for the list parameter