STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
1070
Chapter 42
Fully-Qualified Domain Name (FQDN)
Overview ........................................................................................ 1070
Operational Concerns ..................................................................... 1071
CLI Commands ................................................................................ 1073
FQDN Rejection Scenarios .............................................................. 1075
Overview
The term fully qualified domain name refers to a complete name for a host or computer connected to the Internet. The
name is said to be complete because it contains the host name, domain name or names, and root. A Domain Name System
(DNS) server uses it to resolve the FQDN to the correct IP address.
This feature is intended for MSOs that use IGMP statically provisioned IPv4 multicast groups or the advanced mode DOCSIS
Set-top Gateway (DSG). The advanced mode requires that a DSG source IP address and a multicast group address be
manually configured on each C4 or C4c CMTS. Whenever these addresses change they must again be manually configured
on each CMTS. This feature enables the MSO to replace the DSG tunnel addresses or statically provisioned source
addresses for multicast groups with FQDNs. If a change is required, the MSO can simply update the new source address
and group address information of the FQDN in the DNS server instead of manually in all of the CMTSs.
In addition, the CMTS allows the use of a hostname in the configuration of the classifiers and static IGMP joins. If only the
hostname is specified, the CMTS utilizes its configured IP domain name to complete the FQDN for the DNS lookup. With