Like Ecnerwal already said, this is not going to work. (with just the NVG510 alone)
The problem here is that you're getting a public ip from your modem. This means the modem itself does not act as a DHCP-server. The other method you linked to only works if there is another DHCP-server.
Normally the router/access-point (NVG510) would get an ip from the modem via its WAN-port after which you could use its internal DHCP-server to issue private ip ranges on the LAN-side.
But because this WAN-port is a DSL-port and does not work (correctly) as a normal WAN-port you can't use it. So you would need to connect the modem to a LAN-port and that port should get the public ip. But thats not possible because all the LAN-ports should get the same ip-range to be able to communicate with each other.
There are 3 possible solutions to this:
- You could use a computer to directly connect to the modem and share the internet via a second network-adapter. You can connect your NVG510 to that because your computer acts as a DHCP-server. Downside is that your computer always needs to be on.
- You could get your hands on a cheap broadband router which only acts as DHCP-server (no WiFi necessary because you could connect your NVG510 to it)
- You could buy a less-cheaper broadband router which also has wireless capabilities.
Others have stated what I believe is the obvious; that there is no simple way to repurpose that modem/router into a standalone router. But I would recommend you look at this site which contains tons of deep level hacking info on NVG510. Perhaps something there can lead to something to help you? http://earlz.net/view/2012/06/04/0754/motorola-nvg510-reverse-engineering-information
– JakeGould – 2014-11-22T07:57:29.750Do you still need to connect other devices to the Comcast modem? Or is the NVG510 the only device connected to it? – Rik – 2013-10-01T13:22:31.787
What type is the "Comcast cable"? And on your pc (direct connected to it) do you get a private-ip (10.* or 192.*) or a public-ip? – Rik – 2013-10-01T13:34:46.660
@Rik, the NVG510 is the only device connected to the Comcast modem. The modem gives me a public IP address. I'm not sure what you mean about the type of Comcast cable. It is XFINITY cable internet running over a coaxial cable. – MattL – 2013-10-02T19:07:18.103