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Advanced-Mode DOCSIS Set-Top Gateway 1.2 for the Cisco CMTS Routers
Step 4
Step 5
Configuring NAT to Support Unicast Messaging
This section describes how to configure a Cisco CMTS router for Network Address Translation (NAT) to
enable the use of IP unicast addresses for DSG messaging. This allows the Cisco CMTS router to translate
incoming IP unicast addresses into the appropriate IP multicast address for the DSG traffic.
For the Cisco cBR-8 router, A-DSG 1.2 can use an external router that is close to the Cisco CMTS to support
unicast messaging. In this case, the nearby router must support NAT, and then send the address-translated
multicast IP packets to the Cisco CMTS.
Tip
This procedure should be performed after the cable interface has already been configured for DSG
operations, as described in the
The Cisco CMTS router supports NAT only when it is running an "IP Plus" (-i-) Cisco IOS software image.
Note
Refer to the release notes for your Cisco IOS release for complete image availability and requirements.
Procedure
Step 1
Step 2
Command or Action
cable dsg name-update-intervalminutes
Example:
Router(config)# cable dsg name-update-interval
10
end
Example:
Router(config)# end
Configuration Examples for Advanced-Mode DSG, on page
Command or Action
configure terminal
Example:
Router# configure terminal
interface wan-interface
Example:
Router(config)# interface
FastEthernet0/0
Cisco cBR Series Converged Broadband Routers Application—Voice and Video Configuration Guide
Configuring NAT to Support Unicast Messaging
Purpose
Sets the interval to check the DNS
server for any FQDN classifier
changes.
Returns to privileged EXEC mode.
Purpose
Enters global configuration mode.
Enters interface configuration mode for the
specified WAN interface.
31.
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