Many home internet users are familiar with the situation where the standard four LAN ports on a router are no longer sufficient. You buy a smart TV, connect a gaming console, add a network printer, and suddenly you're running out of ports, and the Wi-Fi signal in distant rooms leaves much to be desired. This is where a network switch comes in, allowing you to instantly increase the number of available wired connections without losing connection quality.
Connecting a router via a switch isn't just a way to add ports, but also an opportunity to intelligently segment the network, separating multimedia devices from work computers. Many users mistakenly believe that expanding the network requires a second router, but in most cases, a simple unmanaged switch, which operates transparently for all devices. Properly organized cabling infrastructure will ensure stable data transmission and reduce the load on the main router's processor.
In this article, we'll take a detailed look at the physical aspects of connecting equipment, the logic behind network layers, and the configuration details that will ensure your local network functions as a cohesive, seamless system. You'll learn why cable connection order matters and how to avoid common IP address conflicts that can paralyze the entire home office.
Choosing Hardware: Switch vs. Router
Before starting installation, it is necessary to clearly understand the differences between the devices, as their functional purposes are fundamentally different. Router A switch is an intelligent device that distributes traffic between networks (for example, between your ISP and your home network), assigns IP addresses, and provides security. A switch operates at a lower level, simply forwarding data packets between devices connected to it within the same network without any routing.
Unmanaged Gigabit Ethernet switches are ideal for expanding the number of ports on a home network. They require no complex configuration: simply connect a cable from the router, and the device is up and running. Managed switches, which allow you to configure VLANs and prioritize traffic, are usually overkill for home use and require extensive network administration expertise.
When choosing a switch, pay attention to the port throughput. If your internet connection exceeds 100 Mbps, using older Fast Ethernet (10/100 Mbps) equipment will become a bottleneck, cutting the speed to a minimum. The modern standard is Gigabit Ethernet, which supports speeds of up to 1000 Mbps and higher, which is critical for watching 4K video and online gaming.
⚠️ Caution: Do not attempt to use an old ADSL modem or discarded ISP router as a simple switch without first reconfiguring it. This may cause a DHCP server conflict, preventing devices on the network from receiving IP addresses and losing internet access.
Physical connection and network diagram
The process of connecting the equipment is physically quite simple, but it requires following a specific sequence of steps to guarantee results. The basic rule is: the switch is connected to the router's LAN port, not the WAN (Internet) port, unless we're creating a complex cascade structure. A twisted pair cable (usually a Cat5e or Cat6 patch cord) is inserted into any available port on the switch, and the other end is inserted into an available LAN port on the main router.
It's important to use properly functioning cables, as damage to even one core within an eight-wire twisted pair cable can reduce connection speed by a factor of ten or even completely disrupt the connection. If you're installing the cable yourself, ensure the termination complies with the T568B standard, which is the most common in home use.
After a physical connection, the LEDs on the switch should light or flash, indicating the presence of a link and data transfer activity. If the router or switch port is unlit, this indicates a broken cable, a faulty port, or a power outage.
Below is a table showing the connection differences for different use cases:
| Scenario | Where do we insert the PC cable? | Where do we insert the router cable? | Result |
|---|---|---|---|
| LAN expansion | To any Switch port | To any Switch port (Uplink is not required) | All devices on one network |
| Connecting a second router | To the LAN port of the second router | In the WAN port of the second router | Creating a subnet (NAT) |
| Direct connection | In the LAN port of the router | No (directly) | Standard work |
⚠️ Note: Interfaces and port locations may vary depending on your equipment model. Always check the manufacturer's official documentation, as manufacturers sometimes change the location of WAN and LAN ports in new device revisions.
Configuring DHCP and Avoiding Conflicts
The most critical step when expanding a network is configuring the DHCP (Dynamic Host Configuration Protocol) service. In the standard "Router -> Switch" setup, the switch itself isn't involved in distributing IP addresses; this function is performed by the main router. However, if you're using an older router in switch mode, you must disable its DHCP server. Otherwise, a conflict will arise, and devices will randomly switch between servers, losing network connectivity.
If you're using a classic unmanaged switch, no software configuration is required—it operates at the hardware level. Your main router will continue to assign addresses to all devices connected to the switch, as if they were connected directly to it. The address pool should be sufficient to cover all devices in the home.
You can check if the system is working correctly using the command line on the connected computer. Enter the command ipconfig (for Windows) or ifconfig (for Linux/Mac) and look at the "Default Gateway" field. The gateway address should match the IP address of your main router, not the switch (which may not have an IP address at all).
What is a Broadcast Storm?
A broadcast storm occurs when broadcast data packets begin to circulate in a loop within the network, consuming all available bandwidth. This often occurs when cables are improperly connected (a loop occurs when two switch ports are connected to each other). Modern switches have STP protection, but older models may fail in such a situation.
Setting up a wired network for a smart home
A modern smart home requires stability, which Wi-Fi can't always guarantee due to interference and congestion. By connecting stationary smart home devices, such as Zigbee gateways, IP surveillance cameras, and media players, via a switch, you free up the wireless bandwidth for mobile devices. This significantly improves the responsiveness of the entire automation system.
For video surveillance systems (NVR), a switch is essential, as high-resolution video streams from multiple cameras can overwhelm a standard router's processor. A switch handles video stream switching within the local network, allowing the recorder and cameras to communicate directly without overloading the main router.
When planning a smart home network, we recommend using switches that support PoE (Power over Ethernet) if your devices (cameras, access points) support this technology. This allows for the transmission of both data and power over a single cable, eliminating the need to run separate wires to 220V outlets.
The logical structure of the network should be hierarchical:
- 🌐 Main router (gateway to the Internet and IP distributor).
- 🔌 Switch (port expander for stationary devices).
- 📡 Wi-Fi access points (connected to a switch for zone coverage).
- 📺 Media clients and TV set-top boxes (for stable streaming).
Diagnosing speed and connection issues
Even with proper installation, speed issues may still occur. First, check the negotiated link speed between the router and switch. If the LEDs are orange instead of green (on some models, this indicates 100 Mbps instead of 1 Gbps), the problem may be with the cable. For gigabit speed, all eight strands of the cable must be intact and properly terminated.
Use speed testing utilities such as iperf3To test traffic between a computer connected to the router and a computer connected via a switch, this will show the actual throughput of the local network segment, eliminating the influence of the ISP's bandwidth.
Overheating is a common problem. Switches, especially those made of metal and without fans, can become very hot under load. Place the device in a location with good air circulation; do not cover it with paper or place it in enclosed spaces.
Network optimization and future improvements
A properly configured switch-based network is the foundation for the future. With free ports, you can add a new computer, network-attached storage (NAS), or gaming console at any time without having to buy new equipment. A switch scales almost linearly: if you need more ports, add another switch and interconnect them.
For advanced users, switching to managed switches opens up the possibility of creating VLANs (virtual networks). For example, you can isolate a guest network or IoT device network from the main network containing private data, increasing security even using the same physical hardware.
Don't forget to back up your router configuration once your network is stable. If a configuration error occurs or hardware is replaced, you can quickly restore the entire system to working order by simply restoring the saved configuration file.
☑️ Network check after installation
Frequently Asked Questions (FAQ)
Do I need to configure the switch before using it for the first time?
In 99% of cases, unmanaged home switches require no configuration. They operate on a plug-and-play principle: simply plug them into a power outlet, connect the router cable and the computer cable, and the network works automatically.
Will a switch reduce internet speed?
A modern gigabit switch doesn't reduce speed because it has sufficient bandwidth. A speed reduction is only possible if you're using older equipment (Fast Ethernet 100 Mbps) or a faulty cable.
Is it possible to connect two switches together?
Yes, this is called cascading. You can connect the ports of two or more switches with a regular patch cord to increase the number of available ports. The main thing is that the primary router is at the beginning of the chain.
Does the length of the cable from the router to the switch affect the signal?
The Ethernet standard allows cable lengths of up to 100 meters without loss of signal quality. In an apartment or house (usually up to 20-30 meters), cable length is irrelevant as long as the cable is high-quality.