Cisco DNCS System Release 2.7 3.7 4.2 Technische Referenzen

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Operations Alert Bulletin 
Limitations on Headend IP Addresses 
for Set-Tops in DOCSIS Mode 
Background 
Engineers at Cable Television Laboratories, Inc. (CableLabs®) have reserved the 
192.168.100.1 IP address for diagnostic purposes for cable modems. Because 
CableLabs did not specify a subnet mask, Cisco chose 255.255.255.0, the Internet 
standard for a Class C IP address. 
If a headend server is assigned an IP address in the 192.168.100.0/24 subnet, then 
neither the cable modem nor the set-top itself will be able to communicate with the 
headend server, resulting in possible service outages. Examples of headend servers 
include the Digital Network Control System (DNCS), the video-on-demand (VOD) 
server, the Dynamic Host Configuration Protocol (DHCP) server, and the Trivial File 
Transfer Protocol (TFTP) server. 
 
 
Recommendation 
System operators must avoid assigning an IP address in the 192.168.100.0/24 subnet 
to any headend server. Any headend servers that currently have an IP address in the 
192.168.100.0/24 subnet must be assigned a new IP address. Furthermore, no set-top 
or cable modem can be assigned an IP address in the 192.168.100.0/24 subnet, either. 
Note:  Set-tops that operate in DAVIC mode are not affected by this limitation. 
 

Zusammenfassung der Spezifikationen technische referenzen für Cisco DNCS System Release 2.7 3.7 4.2

  • Seite 1Operations Alert Bulletin Limitations on Headend IP Addresses for Set-Tops in DOCSIS Mode Background Engineers at Cable Television Laboratories, Inc....
  • Seite 2About This Bulletin About This Bulletin Audience This document is intended for system operators and network administrators of Cisco’s Digital...
  • Seite 3
  • Seite 4For More Information If You Have Questions If you have technical questions, call Cisco Services for assistance. Follow the menu...