Troubleshooting Network Boot Problems
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Maintaining the Router Software
The AN/ANH or ARN router file system resides on the flash memory card, which
is not user serviceable.
You use Technician Interface commands to maintain the local file system on the
AN/ANH or ARN router flash memory card. For more information, see Using
Technician Interface Software and Using Technician Interface Scripts.
When Technician Interface commands require that you specify a volume, always
specify volume 1 for an AN/ANH or ARN router.

Upgrading the Software Image

You can upgrade an AN/ANH or ARN router’s kernel file (krnl_an.exe for the
AN/ANH or krnl_arn.exe for the ARN) using one or both of the following
options:
•Use Netboot to start the router.
This option upgrades the image only in the router’s RAM.
•Use TFTP to transfer the image to the router’s flash memory card, then use
Local Boot to start the router.
This option upgrades the image in both the router’s flash memory card and in
RAM.
Caution: Be very careful when you use the format command. This command
erases all files on the local flash memory card, and the AN/ANH or ARN
router will not be able to local-boot an image or configuration file until you
replace the files. You can avoid this situation by partitioning the flash me mory
card. See Using Technician Interface Software or Configuring and Managing
Routers with Site Manager.
Caution: If you use TFTP to transfer an upgraded image to an AN/ANH or
ARN router flash memory card, and the file transfer is interrupted (for
example, if the router resets, reboots, or loses power), the router’s local file
system on the flash memory card becomes corrupted and the router cannot
boot locally until you restore the file system.