Our gateway device connects our internal LAN and WiFi to the Internet via AT&T.

This is the Gateway from our LAN to the fiber link to the Internet.

A gateway is a piece of networking hardware or software used in telecommunications networks that allows data to flow from one discrete network to another. Gateways are distinct from routers or switches in that they communicate using more than one protocol to connect multiple networks and can operate at any of the seven layers of the OSI model. Ref.https://en.wikipedia.org/wiki/Gateway_(telecommunications)

Ben, add more rambling...

TP-link Archer C4000 v3.0

Firmware: 1.0.3 Build 20191026 rel.13901(5553)
Hardware version: Archer C4000 v3.0

Internet Interface
    MAC: 84-D8-1B-81-EA-3F
    IP: 32.141.97.114
    Subnet: 255.255.255.252
    Gateway: 32.141.97.113
    Primary DNS: 68.94.156.1
    Secondary DNS: 8.8.8.8

WiFi
    (Below is 2.4. There is also 5.1 and 5.2)
    SSID: TP-Link_EA3E
    Mode: 802.11b/g/n mixed
    Channel width: Auto
    Channel: N/A
    MAC: 84-D8-1B-81-EA-3D
    WDS: Disabled

LAN
    MAC: 84-D8-1B-81-EA-3E
    IP: 127.0.0.1
    Subnet: 255.255.255.0
    DHCP Srv: On

Guest Network
    SSID: TP-Link_Guest_EA3E
    Hide SSID: off
    Wireless: off
    Allow Guests: off