AT&T Fiber Internet 600

Overview

Residential fiber internet service providing symmetric 600 Mbps connectivity. Primary WAN for home enterprise infrastructure.

  • Provider: AT&T Fiber

  • Plan: Internet 600

  • Type: GPON Fiber

Service Specifications

Specification Value

Download Speed

600 Mbps

Upload Speed

600 Mbps

Connection Type

GPON (Gigabit Passive Optical Network)

Public IP

Dynamic (currently 23.118.154.158)

Protocol

PPPoE (handled by gateway)

SLA

Residential (best effort)

Gateway: BGW320-505

AT&T-provided combination ONT + router device.

Specifications

Component Specification

Model

BGW320-505

Manufacturer

Nokia (Alcatel-Lucent)

WAN Port

Integrated GPON SFP

LAN Ports

4x 1GbE RJ45

WiFi

802.11ax (WiFi 6) - Disabled

USB

1x USB 3.0 (for UPS signaling)

Management

192.168.1.254 (web GUI)

Network Configuration

Interface IP Address Purpose

LAN

192.168.1.254

Gateway for 192.168.1.0/24

WAN

23.118.154.158 (DHCP)

Public internet

VyOS WAN

192.168.1.2

Firewall uplink

Mode: IP Passthrough

The BGW320 operates in IP Passthrough mode, assigning the public IP directly to VyOS.

Setting Value

Passthrough Mode

DHCPS-fixed

Passthrough Fixed MAC

VyOS eth0 MAC address

Firewall

Disabled (VyOS handles all filtering)

NAT

Disabled (passthrough mode)

WiFi

Disabled (using C9130AX AP)

Performance Validation

Speedtest Results (2026-03-10)

Tested using Ookla Speedtest CLI (multi-threaded):

Server: Nitel - Los Angeles, CA (id: 12191)
   ISP: AT&T Internet
Idle Latency:     3.99 ms   (jitter: 0.56ms)
    Download:   551.04 Mbps
      Upload:   622.76 Mbps
 Packet Loss:     0.0%

Test Commands

# Ookla official CLI (accurate, multi-threaded)
~/.local/bin/speedtest

# List nearby servers
speedtest --servers

# Test specific server
speedtest --server-id 12191
The Python speedtest-cli package is single-threaded and cannot saturate high-bandwidth connections. Use Ookla’s official binary for accurate results.

Network Topology

Internet
    │
    ▼
[AT&T GPON]
    │
    ▼
┌─────────────────────┐
│  BGW320-505         │
│  192.168.1.254      │
│  (IP Passthrough)   │
└─────────┬───────────┘
          │ 192.168.1.0/24
          ▼
┌─────────────────────┐
│  VyOS HA Cluster    │
│  192.168.1.2 (WAN)  │
│  10.50.1.1 (LAN)    │
└─────────┬───────────┘
          │
          ▼
    [Internal Network]

Upgrade Options

AT&T Fiber tiers available in Los Angeles area:

Plan Download Upload Price (approx)

Internet 300

300 Mbps

300 Mbps

$55/mo

Internet 600 (Current)

600 Mbps

600 Mbps

$70/mo

Internet 1000

1 Gbps

1 Gbps

$80/mo

Internet 2000

2 Gbps

2 Gbps

$150/mo

Internet 5000

5 Gbps

5 Gbps

$180/mo
2 Gbps and 5 Gbps plans require BGW320-500 with 2.5GbE/10GbE port or XGS-PON ONT upgrade.

Troubleshooting

Check WAN IP

# From VyOS
ssh vyos-01 "show interfaces ethernet eth0"

# From workstation
curl -s ifconfig.me

Gateway Access

URL: http://192.168.1.254
Username: (on device sticker)
Password: (on device sticker)

Common Issues

Issue Resolution

No internet after modem reboot

VyOS WAN interface may need DHCP renew: renew dhcp interface eth0

Slow speeds

Check with Ookla CLI, not Python speedtest-cli

Double NAT

Verify IP Passthrough mode is enabled on BGW320

Public IP changed

Normal for residential service. Update DNS if hosting services.

References

Related