DKT Comega forsete-ii series Benutzerhandbuch - Seite 5
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3) CPE requests in its LINUX Boot-up process, where configuration file is requested:
Option: 1, 3, 6, 12, 43, 54, 66, 67 - Please make sure that DHCP Server responds to these option re-
quests, as it will influence on the booting sequence, if these are not correctly answered, and may cause
inproper booting of the device.
custom configuration
When the OS issue a dhcp request a filename of a configuration file can be sent to the device. This
configuration file is then downloaded by tftp during the boot process and issued instead of the default
configuration. In this way it is possible to persist settings for each customer (by mapping the hardware
address of the node and the customer number).
The server and the filename of the configuration file should be sent in respective tftp-server-name (op-
tion 66) and bootfile-name (option 67) from the dhcp server. Notice these options are different from the
bootfile/bootserver used in the bootp response.
If it is not feasible that the dhcp server distinguish the customer's configurations base on the hardware
address an alternative method can be used. The dhcp server sends out the name of a generic configura-
tion. This configuration can then include instruction to the node of fetching a node specific configure by
tftp where the requested filename is a combination of the node hardware address.
In the generic configuration script, which is common for all devices and that will provisioned during boot
up, the following instructions can be inserted:
source /etc/dhcp.vars
export WAN_MACADDR=$(ip addr show dev eth0 | grep "ether" | cut -d " " -f6 | tr -d :)
tftp -g -r my_conf_$WAN_MACADDR -l /tmp/config.sh $TFTP_SERVER
save_configuration
source /tmp/config.sh
Alternatively, if DHCP offer in the response instead just end with "/" instead of specific file-name then the device
will try to make TFTP Request for:
<CFG_DIR>dkt_config_<MAC>.sh
<CFG_DIR>dkt_config_<Hostname>.sh
<CFG_DIR>dkt_config_<Model>.sh <CFG_DIR>dkt_config.sh
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