Configure WatchGuard for ISP Switch from Spectrum to Verizon

draft · network static-ipisp-switchmodem-connection

Generated by docuprocessor (prompt article/v3) · 2026-04-22 09:46

Source thread

thread_id: spaces/AAAA05BdS6s/threads/PD2wZ7DnkqE · 14 msgs · first 2024-08-07 · participants: Tech ATech BTech C

Tech A 2024-08-07 14:18

Dr Castillo has a new ISP and they sent us this, I'm not sure what to do. Should I change something on the wg?

image/jpeg noname.jpeg

This is a Verizon router setup card with handwritten network credentials. The card shows ESSID: **Verizon-74XLZ6**, WiFi password: **iambic7-zap-has**, and Admin Password: **BYNZZR33F**. Network configuration details include Static IP **100.12.7.231**, Primary DNS **68.237.161.12**, Secondary DNS **71.250.0.12**, Subnet Mask **255.255.255.0**, and Gateway **100.12.7.1**; a phone number **516 2749222** is handwritten at the top.

Tech B 2024-08-07 15:44

Was this installed already? What is the info in WG now?

Tech C 2024-08-07 15:48

she is switching from spectrum to verizon, so verizon modem is already there, just need to find a time to make all the changes, WG currently has a static IP from spectrum modem

Tech B 2024-08-07 15:52

- Login to the WG, write down the current setup - Change it to Verizon, apply changes - Lose Internet - Spend 100500 hours asking them to disconnect the Spectrum from the WG and connect the one Verizon one instead to the same port as Spectrum was connected - Send someone onsite

Tech B 2024-08-07 15:52

Tech B 2024-08-07 15:53

connect Verizon to another port on the WG, configure it as the failover, disconnect Spectrum, see if that works.

Tech C 2024-08-07 16:00

thats the current info, so new should be i guess: ip: 100.12.1.231 / 24 gw: 100.12.1.1 also need to check if verizon modem is on bridge mode, and never done the failover thing, but I can check and try o.o

image/png image.png

The image shows a network interface configuration panel with four tabs: IPv4, IPv6, Secondary, and Advanced (IPv4 tab is active). Configuration Mode is set to **Static IP**, with IP Address **172.254.105.198 / 30** (subnet mask /30) and Gateway **172.254.105.197**.

Tech B 2024-08-07 16:01

You ask them to connect the Verizon modem to any empty port on the WG and let you know that port #. The rest we can do on our end

Tech B 2024-08-07 16:01

i will gladly help yo with that by appointing Albert to this project 🙂

Tech C 2024-08-07 18:26

So verizon modem was plugged into a Verizon router, I bypassed it and put the verizon modem on port #3 on WG

image/png image.png

**Router/Firewall Back Panel — Cable and Port Configuration** The device has a red and black chassis with labeled Ethernet ports: **0/WAN**, **1/LAN**, **2**, **3**, and **4**; a yellow cable is seated in port **0/WAN**, and three white cables occupy ports **1/LAN**, **2**, and **3**, with port **4** empty. A **Reset** button and a power rocker switch (currently in the **I/ON** position) are visible, along with a **12VDC** barrel connector with power cable attached. A Dell QR code sticker reads **dell.com/QRL/Workstation/5620T**, suggesting this device is mounted to or co-located with Dell Workstation 5620T equipment; no indicator lights, error codes, or visible physical damage are present in the frame.

Tech C 2024-08-07 18:26

what now 👀

Tech B 2024-08-07 18:27

sos

Tech C 2024-08-07 18:28

358422204

Tech C 2024-08-08 14:04

@Sergey Starodub the static IP was 100.12.7.231, so we were mistaken the 7 with a 1 lol

image/png image.png

**Verizon (eth3) Interface Dashboard** The network interface "eth3" is assigned to the **External zone** with IP Address **100.12.7.231**, Gateway **100.12.7.1**, Netmask **255.255.255.0**, and MAC **00:01:21:65:63:DD**. Cumulative traffic shows **Sent: 1,764 KB** and **Received: 237 KB**, with a 20-minute bandwidth graph scaled to 16 Kbps showing near-baseline activity for both sent (pink) and received (teal) traffic. No error messages or alerts are visible.

---
title: "Configure WatchGuard for ISP Switch from Spectrum to Verizon"
category: network
tags: ["static-ip", "isp-switch", "modem-connection"]
source_thread_id: "spaces/AAAA05BdS6s/threads/PD2wZ7DnkqE"
source_space: "spaces/AAAA05BdS6s"
generated_at: "2026-04-22T09:46:36"
participants: ["Tech A", "Tech B", "Tech C"]
---

# Configure WatchGuard for ISP Switch from Spectrum to Verizon

## Problem
A client office was switching from Spectrum to Verizon ISP service and needed their WatchGuard firewall reconfigured for the new static IP assignment. The Verizon modem was already installed but connected through a Verizon router instead of directly to the WatchGuard. The existing WatchGuard configuration used Spectrum's static IP (172.254.105.198/30 with gateway 172.254.105.197) and needed to be updated to Verizon's static IP assignment (100.12.7.231 with gateway 100.12.7.1).

## Resolution
1. Document the current WatchGuard network interface configuration before making changes
2. Bypass the Verizon router by connecting the Verizon modem directly to an available port on the WatchGuard (port #3 was used in this case)
3. Configure the new interface in WatchGuard with the Verizon static IP settings:
   - IP Address: 100.12.7.231
   - Gateway: 100.12.7.1
   - Netmask: 255.255.255.0
   - Assign to External zone
4. Apply the configuration changes
5. Verify connectivity by checking the interface dashboard shows active traffic

Note: The initial IP address was misread as 100.12.1.231 but was corrected to 100.12.7.231 based on the Verizon setup card.

## References
- Source discussion: `spaces/AAAA05BdS6s/threads/PD2wZ7DnkqE`
- Attachments:
  - ![image.png](../attachments/PD2wZ7DnkqE.1jeaEY0j1FQ/image.png) — **Verizon (eth3) Interface Dashboard**
  - ![noname.jpeg](../attachments/PD2wZ7DnkqE.PD2wZ7DnkqE/noname.jpeg) — This is a Verizon router setup card with handwritten network credentials. The card shows ESSID: **Verizon-74XLZ6**, WiFi password: **iambic7-zap-has**, and Admin Password: **BYNZZR33F**. Network configuration details include Static IP **100.12.7.231**, Primary DNS **68.237.161.12**, Secondary DNS **71.250.0.12**, Subnet Mask **255.255.255.0**, and Gateway **100.12.7.1**; a phone number **516 2749222** is handwritten at the top.
  - ![image.png](../attachments/PD2wZ7DnkqE.XZhgzOGgXX4/image.png) — The image shows a network interface configuration panel with four tabs: IPv4, IPv6, Secondary, and Advanced (IPv4 tab is active). Configuration Mode is set to **Static IP**, with IP Address **172.254.105.198 / 30** (subnet mask /30) and Gateway **172.254.105.197**.
  - ![image.png](../attachments/PD2wZ7DnkqE.r8xAP8fX7_k/image.png) — **Router/Firewall Back Panel — Cable and Port Configuration**

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