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HOW TO AUTO-SET 2 IP ADDR on a SINGLE CMs' INTERFACE FACING CMTS

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Ibrologic
HOW TO AUTO-SET 2 IP ADDR on a SINGLE CMs' INTERFACE FACING CMTS

Hi Gurus, I need your help on the following topology:

I am have

( [Internet + VoIP Traffic)-CPE===>CM====>CMTS=====>PE. Eventually, I will use two VRFs to separate Internet and VoIP traffic on the PE.

However, I intend to do NATting on the CM such that
Internet traffic would be natted to a public IP interface received from the CMTS while
VoIP traffic would be natted to another public address also receive from the CMTS.

But, I am having single physical cable interface between CM and CMTS.

Question 1. Is it possible to configure CM cable interface to receive two Public IP addresses under two subinterfaces from the config file during booting or there is another way to achieve this. Please, i need examples on how this can be achieve on CMTS and CM single cable physical interface. Also, how can I achieve the automation also within the config file.

Guys, I would be glad to have your inputs with examples and explanation in brief.

Thank you in advance
Ibrologic

mbowe
If you used an eMTA (cable

If you used an eMTA (cable modem with integrated phone), then this appears to the CMTS as 2 different devices.
So you can easily put phones into subnet1 and everything else into subnet2.

If you only have a CM, and the customer is connecting router with built in phone, then there is only going to be 1 x IP.

In this case you can probably setup rules on your NAT router such that traffic -> voice server is put into NAT pool1 and everything else goes into NAT pool2.

docsis