Chapter 15 Firmware and configuration file maintenance 163BCM50e Integrated Router Configuration - Advanced• You disable Telnet service in menu 24.11.• You apply a filter in menu 3.1 (LAN) or in menu 11.1.4 (WAN) to blockTelnet service.• The IP address in the Secured Client IP field in menu 24.11 does not matchthe client IP. If it does not match, the Business Secure Router disconnects theTelnet session immediately.Backup configuration using TFTPThe Business Secure Router supports the uploading and downloading of thefirmware and the configuration file using TFTP (Trivial File Transfer Protocol)over LAN. Nortel does not recommend using TFTP over WAN, although it canwork.To use TFTP, your computer must have both Telnet and TFTP clients. To back upthe configuration file, follow the procedure shown next.1 Use Telnet from your computer to connect to the Business Secure Router andlog on. Because TFTP does not have any security checks, the Business SecureRouter records the IP address of the Telnet client and accepts TFTP requestsonly from this address.2 Put the SMT in command interpreter (CI) mode by entering 8 in Menu 24 –System Maintenance.3 Enter command “sys stdio 0” to disable the SMT timeout, so the TFTPtransfer is not interrupted. Enter command “sys stdio 5” to restore thefive-minute SMT timeout (default) after the file transfer is complete.4 Launch the TFTP client on your computer and connect to the Business SecureRouter. Set the transfer mode to binary before starting data transfer.
