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Netvanta 3430 - how to configure Eth 0/1 for Ethernet Internet feed

I have an application where the Internet feed is an Ethernet feed from Comcast.  I understand that the Netvanta 3430 should be used for this with one of the 2 Ethernet ports being configured as a Public Interface.  No NIM is used because the feed is not a T1 or similar interface.

We want to use a Netvanta 3430 router with Eth 0/1 linking to the Comcast feed and Ethernet 0/2 to connect to downstream switches.

I would like to configure this (and some downstream configurations that are beyond this topic) in my location before install to make sure all work.

I have a Netvanta 3120 router at my location.

I connected the Eth 0/1 port of Netvanta 3430 to a straight CAT6 patch cable and to a network switch.  Since the Netvanta 3120 provides DHCP, I configured Eth 0/1 of Netvanta 3430 for DHCP - and the port is provided a LAN IP address from Netvanta 3120 and I can see the 3430 on the DHCP section of 3120 as you would expect.

I then assigned Eth 0/2 of 3430 to a static IP on / 16 (which will be the unit's IP address when installed), did not enable DHCP on 3430 (because the server at the install location will provide DHCP), assigned my pc a static IP and connected via cross cable to Netvanta 3430 and succeeded to log on.  I note that Eth 0/1 has an IP address from my 3120 in the proper subnet further confirming there is a link between 3430 Eth 0/1 and the 3120.

However, I cannot get a ping response from the Netvanta 3120 when its IP address is pinged nor do I receive any Internet connection.  It acts like the Netvanta 3430 Eth 0/1 somehow needs to be directed to function as a Public Interface, not a private one.

I am sure I am missing something but do not seem to know what needs to be done so that the 3430 Eth 0/1 acts like a public Interface.

I would appreciate any guidance this forum can provide.

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Re: Netvanta 3430 - how to configure Eth 0/1 for Ethernet Internet feed

You'll need to have an IP route in your 3120 to point that new subnet to the 3430. From the command line in the 3120 it would look like ip route <IP address of 3430>