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site. If this succeeds, the boot loader flash
area is erased and the new boot loader is cop-
ied into this location.
Updating the boot loader is dangerous. If the
user disconnects the power during erasing and
writing of the boot loader (approx. 15 sec-
onds), the device is permanently broken and
there is no way to recover. If the user pulls
the power plug during the download process,
there is no harm to the device. Therefore, boot
loader image update should only be done if
there is a strong need for this.
3) The same mechanism is applied to the firm-
ware (setting "firmware"). Because the firm-
ware is much bigger, the download and writing
procedure takes significantly longer (approx. 2
minutes on a DSL line). However, if the power
fails during the erase and write procedure, the
device can be recovered. For this purpose, it
needs an update using the boot loader and
tftp.
An example file:
<html>
<pre>
# This is a comment
bootloader:http://www.name.de/conf/boot14.bin
firmware: http://www.name.de/conf/image19b.bin
</pre>
<html>
Case study: com88
Scenario
Let us assume that com88 is a large operator that
offers its clients worldwide flat rate VoIP telephony.
Along with a number of other services like web host-
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