Setting up a LAN can be tricky, but I'm here to assist! What specific issues are you facing?
Setting up a LAN can be tricky, but I'm here to assist! What specific issues are you facing?
Here are five additional IP address examples: 192.168.1.100, 10.0.0.5, 172.16.0.23, 198.51.100.12, and 203.0.113.45. Using the same subnet mask for all devices is common in small networks, but if you add mobile phones or iPads, consider assigning unique ranges to avoid conflicts.
Using a basic switch doesn’t require altering IP addresses or subnet masks. Unique IPs are only necessary when you connect separate network cards via a direct cable between the two devices. A switch handles data packets directly between the computers, avoiding the need to send them through a router or modem.
Your setup involves a router or cable modem provided by your ISP. This device assigns IP addresses using DHCP automatically. In your initial listing, you mentioned an IP like 169.254.x.x, which is a public or internet address—not a local network address. The machine connected to this router should also have its own local IP. If it connects through the ISP's equipment without DHCP, it likely receives just an internet IP and not any private range. For devices on your local network, you need a router instead of a switch. A router manages the internet connection and distributes private IPs via DHCP to each device. If your local network contains fewer than 250 computers, using a subnet mask like 255.255.255.0 is effective. This allows you to assign private addresses such as 10.0.0.x, 172.16.0.x, or 192.168.0.x, ensuring each device gets a unique local address while remaining part of the same network. If you choose a subnet mask of 255.255.0.0, you can support up to around 64,000 devices, giving you flexibility in assigning addresses within that range. For specific ranges like 10.0.99.x or 10.0.100.x, simply pick any valid number and ensure it’s unique per device. Using the correct subnet mask helps maintain network organization and connectivity.
Thanks! I noticed those RJ45 female connectors in a wall outlet setup—do you have a specific name for that?
It's a standard Ethernet connection. You need to determine the path of that cable. It leads to a device provided by your ISP. That device might assign a public IP address to the first device it connects to, or it could manage private IPs and public IPs via DHCP if it has built-in router capabilities. If it's the first scenario, simply assign a public IP to anything connected. Then you require a router with multiple gigabit ports. The router links to that device, receives its public IP from your ISP, and acts like a computer itself. From the ISP’s perspective, the router functions as your network hub. It distributes private IPs to all devices on its Ethernet ports using HDCP, converting between private addresses and the public internet address when needed. When transferring files between local computers, data travels directly through the router’s ports instead of reaching the ISP device. If the ISP device includes smart features, a simple switch suffices—it aggregates packets from all ports and forwards them to the port connected to your cable outlet. This setup allows devices on the switch to recognize multiple connections and assign each a unique IP address via DHCP.
It doesn't work that way. A switch understands which IP address each linked device uses and sends only packets meant for that device to the right connection. It figures this out by examining the packet to determine its destination, then forwards it to the correct port on the switch. The packet stays hidden from other ports (and the PC) during processing. This function operates at layer 2 of the OSI model, commonly called "layer 2 switches." Yes, there are also layer 3 switches, but they're more advanced and come with higher costs.
I was explaining how data flows when multiple devices connect to a single Ethernet port. The switch receives packets from the two connected computers and combines them, sending a blended stream to the third port. On that cable, you’ll notice a mix of both sources, and the switch attempts to distribute the load roughly equally between the two devices. If the computers are quick, they can upload the file at about half the normal speed for each.