I have been struggling with a Cisco UBR924 Cable Modem Router trying to make it do what I want it to do. I have managed to get my ISP to provision the modem with a VERY basic DOCSIS configuration file, it only specifies upstream & downstream data rates & to use SMTP v3 MIBs. I am using IOS 12.2 (7) Small Office with H.323 voice support.
I am able to get the router to work fine in DOCSIS bridging mode, but have read every piece of Cisco doccumentation I can find, but cannot find a way to utilize NAT or the VoIP features of the modem. I knew very little about IOS before working with this modem and do not know what to try (or even if this is possible). Here is what I think I know:
-In bridging mode, the modem registers itself with the headend via the DOCSIS negotiation process and SNMPv3 and the cable-modem0 interface is assigned a non-routable ip address.
-NAT requires using "no cable-modem compliant bridge" and during boot, the cbl interface cannot register itself with the headend without processing all the SNMP commands sent in the DOCSIS Bridging configuration routine.
-All NAT examples I found use "cable-modem dhcp proxy"
command which cannot function in bridging mode.
-The VoIP features are useless without an Internet-routable address inside the UBR. I am trying to create a static dial-map. The ISP does not support VoIP and I am not able to get them to modify the headend configuration any further.-
The modem seems to gravitate toward auto-setting itself to bridge-group 59, is there any way to get the c0 interface to do full negotiationing & "bridge" with a virtual interface or NO interface.
Is there any tricks that are used in this type of config?
Any help would be GREATLY appreciated!
I am able to get the router to work fine in DOCSIS bridging mode, but have read every piece of Cisco doccumentation I can find, but cannot find a way to utilize NAT or the VoIP features of the modem. I knew very little about IOS before working with this modem and do not know what to try (or even if this is possible). Here is what I think I know:
-In bridging mode, the modem registers itself with the headend via the DOCSIS negotiation process and SNMPv3 and the cable-modem0 interface is assigned a non-routable ip address.
-NAT requires using "no cable-modem compliant bridge" and during boot, the cbl interface cannot register itself with the headend without processing all the SNMP commands sent in the DOCSIS Bridging configuration routine.
-All NAT examples I found use "cable-modem dhcp proxy"
command which cannot function in bridging mode.
-The VoIP features are useless without an Internet-routable address inside the UBR. I am trying to create a static dial-map. The ISP does not support VoIP and I am not able to get them to modify the headend configuration any further.-
The modem seems to gravitate toward auto-setting itself to bridge-group 59, is there any way to get the c0 interface to do full negotiationing & "bridge" with a virtual interface or NO interface.
Is there any tricks that are used in this type of config?
Any help would be GREATLY appreciated!
