| • | Disable: Disables keep-alive messages. (Default) |
| • | Use NOP: Uses the Telnet NOP (No Op) for keep-alive messages. |
| • | Use Timing Mark: Uses the Telnet Timing Mark (TM) for keep-alive messages. |
| • | Timer Value (Minutes): Specifies the time interval (in minutes) for sending keep-alive messages. |