Please Help setting up

[knowone]

i am an old guy trying to make opnsense work at a makerspace. I have read tuttorials and watched a lot of youtube but i cannot get it to see internet.  It is probably something stupid. Here is what I have:
Spectrum modem router. When switch is just connected to it everything gets out to the internet. hare are specs
ARRIS Router
Host Name: ARRISGW
Routing Enabled
Wireless Disabled
Firewall IPSec Pass Through Enabled
Firewall PPTP Pass Through Enabled
Firewall L2tp Pass Through Enabled
LAN Settings
IP Address: 192.168.0.1
Subnet Mask 255.255.255.0
Enable DHCP server
Start IP Address 192.168.0.2
Ending IP Address 192.168.0.254
NAT Mode Route With NAT
UPNP Enabled
WAN Static Settings (You will not be able to see these from 192.168.0.1 browser)
Static Gateway IP 70.63.227.237
Static Useable IP 70.63.227.238
Static Subnet 255.255.255.252
Static DNS1 24.25.5.60
Static DNS2 24.25.5.61
WAN setup
DHCP enabled
IP Address 172.72.192.11
Subnet Mask 255.255.248.0
Gateway Address 172.72.192.1
Dynamic (IPV6)
DHCP Enabled
IP Address V6 2606:A000:DFC0:0:3010:EB7E:EFD0:EA06
Delegated Prefix 2606:A000:C1C6:ED00::
Delegate Prefix Length 56
IPV6 Gateway Address FE80::217:10FF:FE95:8A97

The opnsense is latest release on a computer between Spectrum and switch set at factory defaults.
I plug modem to motherboard nic which is em0. i have a 4 port nic card in computer and plug switch into last port igb3.
I go to option 1 and try auto find for wan and lan. it cannot find anything so i put em0 for wan and igb3 for lan.
I can ping things from inside lan but cannot get out to internet.
i go to option 2 and set lan for ipv4 and dhcp
everything internal is on 192.168.1.x
Please help me understand what i am doing wrong.
Thank you.

[knowone]

given information above i also tried:
option 2, set WAN
said not to use dhcp
pointed ip to 70.63.227.238
used bit count of 22 which should be subnet mask of 255.255.255.252
set gateway to 70.63.227.237
lan set to dhcp
still no access to internet

[bartjsmit]

You possibly have the WAN interface set to block RFC 1918 addresses. Even with that set, the Arris does NAT, so you either have to:

- set a static route for your LAN on the Arris
- run double NAT on both Arris and OPNsense
- set the Arris in bridge mode and make the ISP connection on OPNsense

I use the last option since it is by far the simplest (single pane of glass)

Bart...