- Radio and television networks under DHCP CMTS program
- DHCP and LDAP linkage solutions
- DHCP interactive set-top box program
This article, we will introduce three major broadcasting industry DHCP program, namely: radio and television networks under DHCP CMTS solutions, DHCP and LDAP linkage solutions and interactive set-top boxes broadcasting network DHCP solutions.
Radio and television networks under DHCP CMTS program
DHCP program under the first look at CMTS. Previous article mentioned CMTS, IP is the most early implementations of two-way coaxial cable network system in it. The following corresponds CMTS CM modem, it will convert an IP network signals coaxial manner, the PC can access, set-top boxes at CM, CM while he is also a network device, but also requires an IP address and configuration file.
CM activation and configuration files need to obtain IP via DHCP, the configuration file specifies the link bandwidth for each network port. After activating the CM to receive and forward the DHCP request from the PC and set-top boxes.
The figure is the whole CM CMTS network to obtain the IP process.
- Authenticate
Before you need to obtain an IP certification. E.g. CM acquired DHCP address, required CM advance account the boss system broadcasting network where the DHCP receiving the request of the CM into the corresponding LDAP server (LDAP server is a boss system docking), the account information of the CM LDAP server to keep inside. Every time a set-top box to obtain IP when requested by the CM, to be first to the LDAP server queries the CM terminal MAC address is successfully open an account. If it is successful, then issued address, if unsuccessful, CM can not get an address, or take a false address. This is a set of recognized certificate process.
- Get the configuration file
After successful completion of the authentication, DHCP offer will be sent to the CM, through the offer, DHCP will provide TFTP service, the IP address and TFTP configuration file name sent by CM under option, CM get the path through the TFT way to the DHCP configuration after the file is downloaded and launched good, PC and set-top boxes can obtain IP via the CM.
DHCP play a role in:
- DHCP authentication MAC docking with LDAP, and match the corresponding IP Policy
- Meanwhile DHCP-assigned IP address of the TFTP support functions, specify the name and address of the TFTP of bootfile
- At the same time we have to support legitimate basis option60 terminal authentication function
Tips:
option Certification: The DHCP protocol defines an option field, which is mainly used to extend the DHCP protocol, option 60 is an option field of the DHCP packets, code 60, you can identify the terminal type, according to different terminal types to select the gateway on the interface. Add own identification various manufacturers in this field for distinguishing different terminal. In order to secure the access terminal, the contents of the string after the authentication is required for each terminal address allocation option 60 of the set top box.
DHCP and LDAP linkage solutions
As already mentioned the function of the LDAP server, domain name National Engineering Research Center (ZDNS) the DHCP and LDAP linkage program has been upgraded:
- Call the MAC information in the LDAP database, and the information matches
- Support and LDAP data butt
- ZDNS TFTP server support for upload and manage files
- DHCP Support DHCP authentication via TFTP module docking with the LDAP data, matching ACL rule, address allocation
- Match the ACL, the terminal identification required profile, issued by the option to inform the terminal acquires bootfile file from TFTP
DHCP interactive set-top box program
Finally, talk radio and television network interactive set-top boxes under the DHCP program ( http://www.zdns.cn/sva.htm L more on that). In addition to CMTS network, another form called coaxial EoC manner. EoC way without obtaining the configuration file, you only need to obtain an IP address. PC not via DHCP, but to obtain an IP address through BASE, PPOE dial. However, the set-top box to obtain an IP address, it has assigned via DHCP. This process is relatively simple, the set top box request, the MAC can be authenticated, the authentication may be performed by option.
Here a side note, set-top boxes can be certified by the above mentioned MAC authentication with LDAP butt, but most are certified to do a simple access authentication (option 60 certification) on it.