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First time posting to a forum, this is all very new to me, I hope I do okay. I normally find solutions to my own problems by searching, but I may have met my match. I know very little about networking and have struggled through a lot of information trying to find an answer.
I have recently subscribed to an ISP, and being on a tight budget I opted out of the wifi connection fee and $5 monthly wifi fee. I had a couple old DSL gateways laying around and I figured it would be easy enough to use one of them as an access point. The modem I received from my ISP (Ubee DDM3521) does not have a router. I believe it does not act as a DHCP server either, because I am being served a public IP address that belongs to my ISP. I was not given a PPP username or password, if they even exist for this account. How do I connect this modem to my router?
I have a choice between a Westell A90-750018, and a Comtrend AR-5381u to use as an access point, both of them are ADSL2+ gateways. The Westell has an uplink port, but it has very few configuration options. I have seen guides online showing useful menu options that should be on my model but aren't. The Comtrend is highly configurable, and I have had some success so far.
Links to the user manual:
Part1: https://fccid.io/L9VAR-5381U/Users-Manual/5-Users-manual-1-2010249
Part2: https://fccid.io/L9VAR-5381U/Users-Manual/5-Users-manual-2-R2-2010250
What I have done:
Added an ethernet WAN interface on ethernet port 1 (manual part 1 page 37)
Added a WAN connection using the ethernet interface (page 38)
(Page 46 shows an auto-detection option, unfortunately I don't see that option in my hardware config.)
Now referring to Appendix E, manual part 2, starting on page 160. Here are the configuration options that I'm getting lost in. I have systematically tried a bunch of different combinations but to no avail.
What I have for current settings:
The ethernet interface connection mode is set to default mode.
For the WAN connection I have PPP redirect disabled.
I added the ethernet port 1 interface as the WAN interface.
I have the WAN service type set to IPoE.
Jump to page 171, I have WAN IP set to static. Automatic didn't seem to work so I tried using the IP address, subnet mask, and gateway that I receive from the ISP when I plug my modem directly into my computer's ethernet port.
I have NAT enabled. I set the ethernet interface as the only default gateway interface.
I used static DNS IP addresses also taken from my computer when plugged into the modem.
With this configuration, I get a green "Internet" light on my router, and I can ping my modem through the router from my computer, but I cannot ping a website or my ISP server's address.
I greatly appreciate any help or guidance with this matter!