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Black Box Console Server user guide 229
How BOOTP works
On bootup or power-up, the unit will send a broadcast request to the BOOTP server(s)
on the network. The request contains the ethernet address of the unit; it asks for network
configuration details (internet address, subnet mask, etc.). This process is shown on
page 229.You can stop the BOOTP server from replying to the unit; see page 236.
BOOTP
request and
response
The BOOTP server checks the ethernet address and looks for a matching address in its
bootptab file:
If a matching ethernet address is found the BOOTP server will reply to the unit; the
reply will contain network configuration information. This information is listed in
the bootptab file for that particular unit (identified by its hardware address). The unit
then boots using the information sent to it. If no matching ethernet address is found
the BOOTP server does not reply; the unit boots from internal memory.
The BOOTP response contains network configuration information; e.g. ip address,
subnet mask, broadcast address. It may also contain details of a bootfile (not
mandatory).
A bootfile (if you specify one) contains a unit’s specific boot information; e.g.
authentication method of users, access permission for the GUI. It may also contain
details of other files (not mandatory); e.g. software version, language files and a
general configuration file.