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Black Box Console Server user guide 240
Multiple BOOTP servers
You may well wish to have a secondary BOOTP server as a back-up to the primary
BOOTP server.
The unit will operate with BOOTP when you have a second, third or more BOOTP
servers on your network. During a reboot the unit processes the first BOOTP reply
received and ignores subsequent replies. If the bootptab file entries are identical on
all your BOOTP servers the first reply received by the unit will be the same as the
other replies.
The rules for multiple BOOTP servers are:
• we recommend they are located on the same network; however if they are on
different network see the advice at How to setup BOOTP on page 231
• if you specify a bootfile (bf), each BOOTP server must contain an identical copy
of this bootfile
• the software file (SW_FILE) and/or configuration file (CONFIG_FILE) can be
located on any host; they do not have to be on the BOOTP server machines
Example of BOOTP
Here is a working example of BOOTP, used to download a new version of software. We
are using tftp with the ‘secure’ option:
1. If possible choose a BOOTP server which is located on the same network as the
unit. Our BOOTP server was located like this.
2. Enable BOOTP on the machine you have chosen as the BOOTP server. E.g. on
our SCO Open Server 5 machine we modified file /etc/inetd.conf, as follows:
tftp dgram udp wait root /etc/tftpd tftpd -s /tftpboot
bootps dgram udp wait root /etc/bootpd bootpd -c/
tftpboot
3. Reboot the BOOTP server to ensure that BOOTP is operating.
4. Make an entry in file /etc/bootptab for your unit; e.g.