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- Device Activation Request: The modem asks the
DHCP server (via the CMTS) for an IP address and
DHCP options.
- Device and Subscriber Authentication: The DHCP server verifies the device’s hardware MAC address
or other DHCP option data against the DHCP database
or third-party OSS/BSS, billing, or subscriber
management database.
- Self-Registration (Optional): If the modem
isn’t registered with the MSO yet, the DHCP
server first provides an IP address and DNS
server address that gives the modem access
to a
web registration page. After the subscribers
enters the requested information, the DHCP
server adds the modem to the proper “client class” according to the service bundle purchased,
and the subscriber management software tells the
modem to re-boot.
- DHCP Options Transfer: The DHCP server grants the modem an IP address, a valid DNS server identifier,
and a TFTP server name. The DHCP server also
sends the modem a configuration filename so that the modem can
request the file by name from the TFTP
server.
Note: Transfer of the filename provides security. Only a modem with knowledge of the correct filename, initiating a request from the correct IP address, is allowed to download that file. The file is not written to disk so it cannot be hijacked, and the TFTP service modifies the filename creation algorithm every 30 minutes.
- Time of Day Request: The modem requests the time
from the ToD server.
- Time of Day Response: The ToD server sends the time to the modem.
- Request for Configuration File: The device requests the file from the TFTP server.
- Generation of Configuration File: The TFTP server dynamically generates a configuration file based on the device type and selected services.
- Configuration File Download: The TFTP server transmits the file to the modem, which then has full access to the subscribed Internet services.
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