DUN ADD creates an association between a callsign (for KISS
links) or gateway IP address (for PPP or SLIP links) and a DUN
script.
DUN DROP removes a previously created association between a
callsign or gateway IP address and a DUN script.
DUN LIST lists the peers to whom a dial-up connection may be
established, and the names of the scripts used to make the
connections.
DUN LOG sets the level of logging, for diagnostic purposes.
The argument is a flag field, comprising the sum of the
following values:
1 Log starts, stops and errors.
2 Log all script lines.
4 Log responses from modem or host.
A value of 0 disables all logging. If no arguments are
supplied, the current logging level is reported.