Purpose
Command or Action
Configures the WAN interface as the
“
outside
”
(public) NAT interface.
ip nat outside
Example:
Router(config-if)#
ip nat outside
Step 3
Enters interface configuration mode for the
specified interface bundle.
interface bundle bundle-number
Example:
Router(config-if)#
interface bundle
10
Step 4
This interface bundle should have
previously been configured for DSG
operations.
Note
Configures the cable interface with an IP address
and subnet that should match the unicast address
ip address ip-address mask secondary
Example:
Router(config-if)#
ip address
Step 5
being used for DSG traffic. This IP address and its
subnet must not be used by any other cable
interfaces, cable modems, or any other types of
traffic in the cable network.
192.168.18.1 255.255.255.0 secondary
Configures the cable interface as the
“
inside
”
(private) NAT interface.
ip nat inside
Example:
Router(config-if)#
ip nat inside
Step 6
Exits interface configuration mode and returns to
global configuration mode.
exit
Example:
Router(config-if)#
exit
Step 7
Maps the unicast IP address assigned to the cable
interface to the multicast address that should be
used for the DSG traffic.
ip nat inside source static
ip-multicast-address cable-ip-address
Example:
Router(config)#
ip nat inside source
static 224.3.2.1 192.168.18.2
Step 8
Repeat
Step 2, on page 23
and
Step 8, on
page 24
for each cable interface to be
configured for DSG unicast traffic.
Step 9
Exits global configuration mode and returns to
privileged EXEC mode.
end
Example:
Router(config)#
end
Step 10
Cisco cBR Series Converged Broadband Routers Application
—
Voice and Video Configuration Guide
24
Advanced-Mode DOCSIS Set-Top Gateway 1.2 for the Cisco CMTS Routers
Configuring NAT to Support Unicast Messaging
