Why Is Your Network Getting an IP Address from Another ISP? Here’s How to Fix the Broadcast Problem

hi kids, this is your dad, huahuanjayy wkwkwk, Nuenomaru the handsome is back in action.
Okay, this tutorial article is very useful as a basic guide to handling common network issues that occur when your provider covers an apartment area where there is more than one broadband internet service provider. The most basic network problem usually happens during activation, when a provider’s technician plugs in all the available LAN cables inside the customer’s unit. Meanwhile, one of those LAN cables is still connected on the panel side to an active switch port. As a result, the switch in the panel indirectly receives broadcast traffic from the newly installed device of another provider.
Ideally, when a customer is no longer subscribed, the corresponding switch port in the panel should be shut down. However, if this situation has already occurred, let’s continue using the most basic troubleshooting approach so we can build a clear logical process in resolving the network issue.

The customer in Unit XXX, West Wing, is no longer subscribed. However, the UTP cable going to the panel has not been dismantled.
This is to make it easier in case the customer decides to subscribe again in the future, so there will be no need to pull a new UTP cable from the panel to the customer’s unit (which also helps reduce installation costs charged by the apartment management).

** before we continue, I would like to remind you that this is one of the most basic methods, but it is not efficient. I am writing this method solely for the purpose of building a smoother analytical process such as performing MAC tracing, executing switch commands, and manually handling broadcast traffic within the network.

First, the user may complain that the internet package they subscribed to does not match the expected performance. After checking via Speedtest and WhatsMyIP, it is detected that the device is obtaining a DHCP IP address from a different broadband provider, not from the ISP the user subscribed to just like a typical retail customer who would immediately file a hard complaint with customer service. Then a technician is dispatched to visit the unit. Here are several steps you can take:

1 Check the Gateway
When the technician is on site, connect a laptop or smartphone to the customer’s unit network, either via Wi-Fi or LAN cable.
Once connected, immediately open the IP gateway address in a browser to access the login page of the provider’s device that is broadcasting the signal. If you are able to log in to the device (most broadband ISP default usernames and passwords can usually be found on Google), check the MAC address of that device.
In this case, the customer subscribes to broadband internet from an ISP called Nue. However, when the technician checks on site, the customer is receiving a DHCP broadband IP address from a different provider.

Once the MAC address has been identified, you can proceed to shut down the corresponding port or blacklist the MAC address at Layer 2 within your network infrastructure.

 

2 arp -a
If you are unable to access the gateway of the device that is broadcasting, open Command Prompt (CMD) on the technician’s laptop at the site. Type arp -a to view the MAC addresses of devices on the connected network. Once the list of MAC addresses appears, copy and identify the MAC address by checking it on https://macvendors.com/
If it is identified as a device brand that is not part of your infrastructure, immediately trace it and shut down the corresponding port. However, keep in mind that the arp -a command only displays devices on the network that have previously communicated with your laptop.

 

3 Trace the Full Layer 2 Network Infrastructure
If all previous methods fail, we move to the most fundamental approach. The technician should perform a direct bypass test to the Layer 2 switch in the panel (the ISP internet source), connecting the switch directly to the laptop. Then, the Layer 2 team will run the `show mac` command and check whether any switch port is carrying more than two MAC addresses on a single port. If such a port is found, proceed to shut it down. Meanwhile, the field technician should verify whether the laptop is still obtaining a DHCP IP address from a different provider.
This method focuses on identifying MAC addresses and shutting down ports one by one to ensure that there is no more than one broadcast source and that the unwanted broadcast is completely eliminated from the network.

4 Default Native VLAN 1
This step is an initial mitigation to prevent looping and unwanted broadcast traffic. Let’s go into the explanation. Using Native VLAN 1 in a network that employs VLANs can create potential looping and broadcast issues if not managed properly. The Native VLAN is an untagged VLAN used to carry untagged traffic. On many networking devices, VLAN 1 is set as the default Native VLAN.

Looping and broadcast issues can occur in the following situations:

- Native VLAN Mismatch: If there is a configuration mismatch between connected devices ex; one device has Native VLAN 1 while the other uses a different Native VLAN—the untagged traffic may be misinterpreted, potentially causing loops.
- Double Tagging (Q-in-Q): If a device sends a tagged packet (with a VLAN ID) to a port configured with Native VLAN 1 and adds VLAN 1 tagging again before sending it out, double tagging occurs. This can create network issues and loops on other devices.
- Unintentional Inclusion in Trunk Links: VLAN 1 can sometimes be accidentally included in trunk links (paths that carry multiple VLANs across the network). If Native VLAN 1 traffic enters a trunk and is misinterpreted by the receiving device, it can cause looping.

To avoid these problems, careful VLAN configuration is essential. Best practices to prevent looping caused by Native VLAN 1 include:

- Change the Native VLAN: Change the Native VLAN from the default value (1) to a VLAN ID that is not used by other VLANs, reducing the risk of loops.
- Separate Data and Management Traffic: Use different VLANs for user data and management traffic. Avoid using VLAN 1 for user data.
- Monitoring and Understanding: Monitor VLAN configurations on all network devices and understand how VLANs and Native VLANs operate to identify and fix potential issues before loops occur.

Therefore, to prevent looping and broadcast, the Native VLAN must be redefined and changed from the default VLAN 1. In this setup, I use Native VLAN 800, and on the opposite side, Native VLAN 975 is configured. Only the required VLANs are allowed. When properly configured, VLAN 1 traffic will no longer pass through, making this method effective in preventing network loops and broadcast. The MAC addresses carried by VLAN 1 need to be analyzed.

ex, before:
pop_nue6969#show mac address-table vlan 1
          Mac Address Table
-------------------------------------------
Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    xxxx.314c.51cb    DYNAMIC     Gi0/1
   1    xxxx.314c.51cc    DYNAMIC     Gi0/1
   1    xxxx.31d2.edfb    DYNAMIC     Gi0/1
   1    xxxx.5ab9.5c89    DYNAMIC     Gi0/1
   1    xxxx.5afa.6138    DYNAMIC     Gi0/1
   1    xxxx.f461.9be2    DYNAMIC     Gi0/1
   1    xxxx.f461.9be3    DYNAMIC     Gi0/1
   1    xxxx.xxxx.4c98    DYNAMIC     Gi0/1

after party ^_^:
pop_nue6969#show mac address-table interface fastEthernet 0/4
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
  800     xxxx.6938.3c40    DYNAMIC     Fa0/4
  800     xxxx.3216.6c37    DYNAMIC     Fa0/4
  800     xxxx.aeb4.8be7    DYNAMIC     Fa0/4
  95     xxxx.a11c.8c20    DYNAMIC     Fa0/4
  95     xxxx.f988.69eb    DYNAMIC     Fa0/4
  95     xxxx. xxxx.abf7    DYNAMIC     Fa0/4 

 

Based on this case study of basic network issues with an ISP covering an apartment area, this is one of the recurring problems. Understand the concepts of handling both Layer 1 and Layer 2 network issues.
Hahaha alright, that’s a wrap for today’s article—my coffee’s gone, so that’s my cue to stop typing.

Let’s end this with a Bismillah at the start and an Alhamdulillah at the finish. Catch you next time, tech gembelers!.

 

 

./Nuenomaru

 

Read More

Upgrade Your Fiber Network with FTTR Infrastructure Technology - Switching Mode ONT FTTR ZTE

hi kids, this is your dad, huahuanjayy wkwkwk, Nuenomaru the handsome is back in action.
Because I just came down from the mountain and we’re about to enter the month of Ramadan. today I’m going to invite you all to briefly review and level up our skills, from GPON FTTH to GPON FTTR.

Perhaps we can briefly discuss what FTTR is:

FTTR (Fiber To The Room) is an advanced fiber optic networking technology that extends optical cables directly into every room, rather than stopping at the home as with FTTH. This technology delivers stable gigabit internet speeds, low latency, and seamless Wi-Fi coverage throughout every corner of the house making it ideal for 4K streaming, gaming, and smart home applications.
Key Advantages and Features of FTTR:
1 Stable & High-Speed Connection: Uses ultra-thin, transparent fiber optic cables (millimeter-sized) installed in every room, delivering more stable speeds compared to conventional Wi-Fi.
2 Wide Coverage: Eliminates weak or “dead” Wi-Fi zones caused by concrete walls or multi-story and large home layouts.
3 Main Components: Consists of a Master Unit (acting as a central hub/mini OLT) and Slave Units (Wi-Fi 6/7 access points) installed in each room.
4 Aesthetic Installation: The fiber optic cables used are extremely thin and flexible, ensuring they do not disrupt interior aesthetics.

Here, I am using GPON ONT devices from ZTE, specifically the ZXHN G8605 (ONT Master) and ZXHN G1611 (ONT Slave).
Next, here is a simple topology for testing Wi-Fi roaming on this FTTR ONT setup.

1 Go to IP ONT and Login ONT Master with superadmin account: admin | Web@0063

2 Create dial-up accounts using either IPOE or PPPoE (here, I am using the PPPoE method).
Go to Internet > WAN > WAN Connection, then fill in the settings according to the DHCP/internet configuration you have prepared.

After that, make sure the WAN status shows Connected.

Internet > Status > WAN
 

3 Switching Mode
In this method, the OPTICAL port on the ONT Master will be assigned to forward the fiber cable connection to the ONT Slave in each room (via a fiber optic splitter/roset). The uplink of the ONT Master will then be switched to a LAN port.

Go to Management & Diagnosis > Uplink Mode Switch > Uplink Mode: LAN > Uplink Port: LAN 1.

 

4 Routing
Next, we need to direct the WAN Connection routing to the WAN profile that we previously created.
Go to Local Network > Routing > IPv4.

5 Speed and Roaming Testing
If the fiber cable connection between the ONT Master and the ONT Slave is functioning properly, the Wi-Fi settings will automatically synchronize from the ONT Master.
To test roaming, walk from the ONT Master area to the room where the ONT Slave is installed. Check whether the signal drops during the transition or if the connection remains stable and seamless.

Click the Home menu.
In the WLAN Device section, you will see the devices connected to the ONT Master’s signal, while in the LAN Device section, you will see the devices connected to the ONT Slave’s signal. sample: device client (infinix) roaming done.

 

Alright, that’s a brief overview of this new technology in GPON infrastructure. Feel free to read this article as well: PPPoE Server–Client Configuration Using MikroTik - Developed further as a reference for building a simple RT-RW Net business
Hopefully, you can also implement this in your RT-RW Net business. For those who are observing, have a blessed fasting month.
Well done, Now you can start by handing out sales brochures to your neighbors or your closest family members. #GGWP

Hahaha alright, that’s a wrap for today’s article—my coffee’s gone, so that’s my cue to stop typing.

 

Let’s end this with a Bismillah at the start and an Alhamdulillah at the finish. Catch you next time, tech gembelers!.

 

./Nuenomaru

 

 

Read More

Wi-Fi Slow? Here’s How to Solve Channel Overload on Ruijie Access Point

hi kids, this is your dad, huahuanjayy wkwkwk, Nuenomaru the handsome is back in action.
Okeii, I’m sharing this tutorial now because tomorrow my friends and I will start another mountain hiking trip. After such a long time of only stepping on the bathroom scale, we’re finally climbing a mountain again. Don’t miss us too much, guys. Please pray that we return home safely.
Alright, this tutorial is simple and made to help beginners like me. This method applies to all Ruijie access point models that are connected to the cloud.

 

Alright, first let’s look at this case. On the monitoring page, the access point shows the channel usage status as overload and busy.
RF Channel 1 is a 2.4 GHz frequency channel. Most likely, the location is experiencing interference from other Wi-Fi access points, mobile phone hotspots, or even radio transmitters operating in the area.

1 As a first step, it is best to scan the frequency/channels at the location using applications such as: inSSIDer, WiFi Explorer, NetSpot, WiFi Analyzer, WiFiman, or Vistumbler, to identify nearby Wi-Fi signals and the channels being used.

2 Click on the access point you want to tune, then go to the configuration menu to adjust the channel to one that is more idle or has less interference in that area.

3 Select a channel with minimal or no interference. Once selected, Adjust the channel power as well > click Save.

you can see that after tuning the access point’s channel and frequency, the monitoring shows it has improved. Next, feel free to test it yourselves start by moving around and testing the Wi-Fi connection.

Hahaha alright, that’s a wrap for today’s article—my coffee’s gone, so that’s my cue to stop typing.

 

Let’s end this with a Bismillah at the start and an Alhamdulillah at the finish. Catch you next time, tech gembelers!.
 

 

 

./Nuenomaru 

Read More

Ruijie Access Point Limitation Based on Connected Devices (Via Cloud)

hi kids, this is your dad, huahuanjayy wkwkwk, Nuenomaru the handsome is back in action.
Okay, this article is super simple. This tutorial is made to help beginners like me. For this tutorial, I’m using a Ruijie AP820 access point. Hopefully, this trick works on your device too.

1 Log in to Ruijie Cloud.
2 Click the Project menu > select your project > Device > AP > choose the access point you want to limit > click eWeb > Create Tunnel > Open with Domain.

3 Log in using your username and password (you can check how to find them using this method: OLD Design > Configuration > Wireless > Basic > eWeb).

4 Click Config > AP > Client Limit. The default is 256 clients, adjust it to your needs, then click Save. 

 

Hahaha alright, that’s a wrap for today’s article—my coffee’s gone, so that’s my cue to stop typing.

 

Let’s end this with a Bismillah at the start and an Alhamdulillah at the finish. Catch you next time, tech gembelers!.

 

./Nuenomaru

 

Read More

Unlock Huawei GPON to XPON - Save on Business Costs!

hi kids, this is your dad, huahuanjayy wkwkwk, Nuenomaru the handsome is back in action.
This article may only be useful for some people, but before we go any further, let’s first talk about XPON.
In short, xPON (Passive Optical Network) is a next-generation fiber optic technology that supports two standards at the same time: GPON (Gigabit PON) and EPON (Ethernet PON). An xPON ONU/ONT device can automatically detect and adapt to the connected OLT, giving network operators high flexibility without the need to replace existing infrastructure.
 

So basically, an xPON ONT can work across different OLT brands, making it a great option if you want to reduce costs on new ONT purchases. You can buy or obtain a used Huawei GPON ONT, unlock it, and then use it on your own network infrastructure. This solution is especially suitable for RT-RW Net business owners and small-scale local ISPs who want to keep expenses low while still maintaining a reliable fiber network.

This article can also be developed further as a reference for building a simple RT/RW Net business zuahahaha #manajanji19jutalapangankerja!!! Wishing you smooth sales! Once you reach 100 homes connected (100 active users), treat me, future young Boush #CI-i-O

Download tools: Grepe aku senpai ;) 

SuperAdmin Login List ONT Huawei:

Username: Support
Password: theworldinyourhand

Username : telecomadmin
password : admintelecom

username : telecomadmin
password : zep2kjzol

username : Support
password : zep2kjzol

username : root
password  : adminHW

Username : telecomadmin
Password  : g1g.4dm1n

Username : Support
Password  : HuaweiHG8245h

Username : user
Password  : user

Username : Admin
Password  : admin 

=============== 

1 Enable the Telnet Client on your Laptop/PC OS
Here, I am using Windows OS. Go to Control Panel → Programs → Programs and Features, then click “Turn Windows features on or off”, and checklist the Telnet Client option.

2 Disable all antivirus and firewall software on your laptop

 

3 Log in to the Huawei ONT web page (HG or EG series, whichever you’re using)
Go to the Device Information menu. If it still says “GPON Terminal”, then it’s time to continue with the tutorial in this article.

 

4 Update the Configuration File
Go to Settings → Maintenance & Diagnosis → Configuration File & Management → Browse, select the file you downloaded earlier (R022.xml), and then click “Update Configuration File”.

After a successful upload, the ONT will usually restart automatically. Wait until the ONT powers back on and the indicator shows Normal.

5 Flash
Open the folder you downloaded earlier and click on the Flasher Tool.
If you’re using an EG series ONT and your laptop doesn’t get a DHCP IP from the ONT, manually set your laptop’s LAN IP to:
IP: 192.168.100.2
Gateway: 192.168.100.1
Subnet: /24
Then, ping the gateway and open the gateway IP in your browser. Once connected, you can proceed to step 5.

 

Previously, my ONT gateway was 192.168.18.1 (EG series), but after flashing, it automatically changed to 192.168.100.1.

Click Tools Flasher → Flash. For the Network, select the IP adapter that is on the same subnet as the ONT. Click Browse and select the second file (R022.bin).
Click Status to show the flashing progress, then click Start. Wait until the process completes successfully.

Once done, click Stop, and then close the Flasher Tool.

After that, all the ONT indicators will light up. Manually restart the ONT and wait until the status indicator shows Normal again.

6 BAT File
Double-click the file named “3-Klik 2x-R022.bat” and wait for the process to finish.

When it’s done, the ONT will restart on its own. Just close everything and wait until the ONT is back on and the indicator shows Normal.

7. Flasher
Open the Flasher Tool again, click Flash, select the laptop IP adapter that is on the same subnet as the ONT, then click Browse and choose file number 4 (permanen-R022.bin).
Click Status, then Start, and wait until the process shows Failed. Once it fails, click Stop.
Finally, manually restart your ONT and wait until it returns to Normal. 

 

8 Preset
Once the ONT is back to Normal, continue flashing with file 5preset-r022.bin and click Start. Wait until the status shows Failed again. After it fails, click Stop and close the Flasher Tool. Then, manually restart your ONT and wait until the ONT indicator returns to Normal.

9. XPON
Once the ONT is back to Normal, double-click the file named “6-xpon klik2x-r022.bat”.
Wait until the process is complete.

Once the process is complete, simply close the application.
Then, log in again to the ONT web page. Keep in mind that the login credentials will automatically change to (telecomadmin:admintelecom).

Go to the Device Information menu. If the flashing process was successful, the status will show GPON/EPON Terminal, and the WAN menu will still be available.

If the WAN menu doesn’t appear, repeat from step 6, but during step 8, flash the file until the status shows Success (the only difference is in step 8).

Well done, Now you can start by handing out sales brochures to your neighbors or your closest family members. #GGWP
I hope this method can help you save on ONT costs, and this article is meant to help beginners like me. stop by for a moment: touch me senpai ;)
Hahaha alright, that’s a wrap for today’s article—my coffee’s gone, so that’s my cue to stop typing.

Let’s end this with a Bismillah at the start and an Alhamdulillah at the finish. Catch you next time, tech gembelers!.
 

./Nuenomaru

 

Read More

PPPoE Server–Client Configuration Using MikroTik - Developed further as a reference for building a simple RT-RW Net business

hi kids, this is your dad, huahuanjayy wkwkwk, Nuenomaru the handsome is back in action.
In this third article of 2026, I will share a simple tutorial aimed at helping beginners like myself.
This article can also be developed further as a reference for building a simple RT/RW Net business zuahahaha #manajanji19jutalapangankerja!!!

Wishing you smooth sales! Once you reach 100 homes connected (100 active users), treat me, future young Boush #CI-i-O 

1. Configure IP Toward ISP / Gateway

Assign the interface to the UPLINK port 

2. Configure NAT
Click the IP menu, choose the Firewall submenu, then click the NAT tab.
In the Rules table that appears, fill in the following settings (yes, sweet kid):
Chain: srcnat
Out. Interface: select the port that leads to the downlink / ISP direction.
Action: masquerade 

3. Create an IP Pool (for PPPoE Clients)
Click the IP menu, select the IP Pool submenu, then click the + button.
After that, fill in the fields as follows:
Name: enter any name you like
Addresses: allocate the IP address range as you prefer

4. Create a PPP Profile
Click the PPP menu, go to the Profiles tab, then click the + button.
Fill in the following fields:
Name: enter any PPPoE profile name you like
Local Address: adjust this according to the IP address pool you created earlier
Remote Address: select the PPPoE IP Pool name that you created earlier
DNS Servers: 8.8.8.8, 1.1.1.1 (example only)

apply~>OK

 

5. Create a PPPoE User Account (Authentication)
Still in the PPP menu, select the Secrets tab, then click the + button.
Fill in the following fields:
Name: enter any name you want to use as the username
Password: enter any password you want to use
Profile: select the PPP profile that you created earlier

6. Enable the PPPoE Server
Click the PPP menu, select the PPPoE Servers tab, then click the + button.
Fill in the following settings:
Interface: select the downlink port (the port connected to an L2 device such as an OLT or switch)
Service Name: enter any name you like
Default Profile: select the PPP profile that you created earlier
✓ One Session Per Host: check this option so that one PPPoE account can only be used by one client
Disabled: X

Well done, Now you can start by handing out sales brochures to your neighbors or your closest family members. #GGWP
Your PPPoE account is all set and ready to be dialed on your customers’ devices.
If you want to set usage limits or tweak it a bit, check out this article too, Pak. Boush: GREPE AKUH!!

Hahaha alright, that’s a wrap for today’s article—my coffee’s gone, so that’s my cue to stop typing.

Let’s end this with a Bismillah at the start and an Alhamdulillah at the finish. Catch you next time, tech gembelers!.
 

./Nuenomaru

Read More