ZyXEL Communications B-2000 User Manual

ZyAIR B-2000 Wireless LAN Gateway with 4-Port Switch 

Firmware and Configuration File Maintenance                                                                         10-13 

Step 1.  Use telnet from your computer to connect to the ZyAIR and log in. Because TFTP does not have 

any security checks, the ZyAIR records the IP address of the telnet client and accepts TFTP 
requests only from this address. 

Step 2.  Put the SMT in command interpreter (CI) mode by entering 8 in Menu 24 – System 

Maintenance. 

Step 3.  Enter the command “sys stdio 0” to disable the console timeout, so the TFTP transfer will not be 

interrupted. Enter “command sys stdio 5” to restore the five-minute console timeout (default) 
when the file transfer is complete. 

Step 4.  Launch the TFTP client on your computer and connect to the ZyAIR. Set the transfer mode to 

binary before starting data transfer. 

Step 5.  Use the TFTP client (see the example below) to transfer files between the ZyAIR and the 

computer. The file name for the firmware is “ras”. 

Note that the telnet connection must be active and the ZyAIR in CI mode before and during the TFTP 
transfer. For details on TFTP commands (see following example), please consult the documentation of your 
TFTP client program. For UNIX, use “get” to transfer from the ZyAIR to the computer, “put” the other way 
around, and “binary” to set binary transfer mode. 

The following is an example TFTP command: 

tftp [-i] host put firmware.bin ras 

where “i” specifies binary image transfer mode (use this mode when transferring binary files), “host” is the 
ZyAIR’s IP address and “put” transfers the file source on the computer (firmware.bin – name of the 
firmware on the computer) to the file destination on the remote host (ras - name of the firmware on the 
ZyAIR). 

Commands that you may see in GUI-based TFTP clients are listed earlier in this chapter. 

FTP or TFTP are the preferred methods for uploading firmware to your ZyAIR. However, in the event of 
your network being down, uploading files is only possible with a direct connection to your ZyAIR via the 
console port. Uploading files via the console port under normal conditions is not recommended since FTP 
or TFTP is faster. Any serial communications program should work fine; however, you must use the 
Xmodem protocol to perform the download/upload.