Local Area Network via Wi-Fi: How to Connect Devices Without Internet Access

Find the "Local Area Network" or "LAN" section

Make sure the DHCP server is enabled

Check the range of IP addresses being distributed (usually 192.168.x.100-200)

Save settings and reboot the router-->

If after connecting the devices do not see each other, check the firewall settings (Firewall) on each of them. Antiviruses and built-in protections often block local traffic.

3. Creating an ad-hoc network (direct connection)

This method allows you to connect two devices directly, without a router. It is suitable for laptops, PCs with Wi-Fi adapters, and some Android-smartphones. On Windows the setup looks like this:

Open Command line as administrator and run:

netsh wlan set hostednetwork mode=allow ssid="MyAdHoc" key="12345678" keyUsage=persistent

Then start the network with the command:

netsh wlan start hostednetwork

On the second device, connect to the created network MyAdHoc with a password 12345678Please note: in ad-hoc In networks, data transfer speeds are usually lower than through a router due to the lack of traffic optimization.

For macOS And Linux creation process ad-hoc networks are more complex and require the use of a terminal. Android This functionality is often missing without root rights.

4. Setting up file sharing

Even if the devices are connected to the same network, they will not be able to exchange files without additional settings. Windows follow these steps:

• 📁 Open Control Panel → Network and Internet → Network and Sharing Center.
• 🔧 Select "Change advanced sharing settings."
• 🔄 Turn on network discovery and file sharing for the current profile.
• 🔐 Disable password protection if all devices are trusted.

On macOS go to System Preferences → Sharing and turn on the "File Sharing" option. Android For file sharing, it is easier to use specialized applications, for example, Feem or LocalSend.

To check the network functionality, open Conductor (on Windows) or Finder (on Mac) and go to the "Network" section. All devices connected to the local network should be displayed there.

5. Checking and troubleshooting

If your local network is not working, first check the basic settings:

For diagnostics use the command ping in the command line. For example, to check the connection with the device via IP 192.168.1.100, execute:

ping 192.168.1.100 -t

If pings don't work (The specified node is unavailable), the problem is at the network level. If there are pings but no access to folders, the problem is in the sharing settings.

6. Local Wi-Fi network security

A local Wi-Fi network is vulnerable to external attacks unless precautions are taken:

• 🔒 Use WPA3 (or at least WPA2) to encrypt traffic. WEP and open networks are not allowed.
• 🛡️ Turn it off WPS in the router settings - this protocol has critical vulnerabilities.
• 📡 Hide SSID network if only your devices connect to it.
• 🔄 Update your router firmware regularly (every 3-6 months).

Important: If you transfer sensitive data (documents, passwords, financial information) over your local network, use additional encryption. For example, zip password-protected files before transferring them or set up a VPN server on one of your devices.

To restrict access to shared folders, set up separate accounts with passwords. Windows this is done through Control Panel → Computer Management → Local Users and Groups.

⚠️ Warning: Do not use simple passwords like 12345678 or qwerty For Wi-Fi networks. Attackers can connect to your local network and intercept traffic even if they don't have internet access.

7. Optimizing data transfer speed

The speed of file exchange in a local Wi-Fi network depends on several factors:

• 📶 Wi-Fi standard: 802.11ac (Wi-Fi 5) provides up to 1.3 Gbps, 802.11ax (Wi-Fi 6) - up to 9.6 Gbps under ideal conditions.
• 📡 Frequency: 5 GHz is faster than 2.4 GHz, but has a smaller coverage area.
• 💻 Hardware limitations: Hard drives (HDD) slow down the transmission more than SSD.
• 🔧 Protocol: SMB 3.0 faster SMB 1.0, but requires device support.

For maximum speed:

1. Connect both devices to the 5 GHz network (if the router is dual-band).
2. Use gigabit ports if you transfer files between PCs via cable.
3. Disable power saving mode for your Wi-Fi adapter in Device Manager.

Actual file transfer speeds over Wi-Fi rarely exceed 30-50 MB/s (240-400 Mbps) due to protocol overhead. For comparison: over a cable Gigabit Ethernet You can get up to 110-120 MB/s.

8. Alternative ways to share files

If you are unable to set up a local network, consider alternative options:

• 📱 File transfer apps: LocalSend, Snapdrop, Feem (work via local network or direct connection).
• 🔌 Cable connection: For Android and PC can be used USB-OTG cable with mode MTP.
• ☁️ Cloud services: Google Drive, Dropbox or Yandex Disk (suitable if there is internet, but synchronization is required).
• 💿 Flash drives: An old but reliable method for large files (videos, disk images).

Apps like LocalSend are often easier to set up than manually configuring network access. They automatically detect devices on the same network and allow file transfers without any additional configuration.

⚠️ Please note: When using cloud services to transfer files, please remember that data is temporarily stored on third-party servers. For sensitive information, it is better to use local methods.

For regular exchange of large amounts of data (for example, backups), it's better to set up a full-fledged local network. Alternative methods are convenient for one-time tasks.

FAQ: Frequently Asked Questions