A universal serial bus (USB) network adapter is a computer accessory that enables a wireless or standard internet connection on the computer into which it is plugged. This type of adapter is connected to the computer through a normal USB port, and it very rarely requires more than a few clicks to install. USB network adapters occasionally are required for gaming consoles as well.

Use this application to backup and restore presentation, pictures, songs and applications from and to USB Flash Drive devices and take them with you. Use USB Flash Drives to store personal data, to keep your network configuration and to share information with your friends. Microsoft USB Flash Drive. A USB port is a standard cable connection interface for personal computers and consumer electronics devices. USB stands for Universal Serial Bus, an industry standard for short-distance digital data communications. USB ports allow USB devices to be connected to each other with and transfer digital data over USB cables.

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Download The USB/IP Project for free. The USB/IP Project aims to develop a general USB device sharing system over IP network. To share USB devices between computers with their full functionality, USB/IP encapsulates USB I/O requests into IP packets and transmits them between computers. A universal serial bus (USB) network adapter is a computer accessory that enables a wireless or standard internet connection on the computer into which it is plugged. This type of adapter is connected to the computer through a normal USB port, and it very rarely requires more than a few clicks to install.

A wireless network adapter is used mainly for older computers and occasionally laptops that lack built-in wireless, or Wi-Fi, capabilities. By adding Wi-Fi abilities to a computer, the user can connect to a network from anywhere within the range of that network. Though most laptops already have wireless functionality, some older models are without it. Installing a USB adapter on a laptop will enable the user to connect to wireless networks in places that offer Wi-Fi.

The wired USB network adapter is another option. It mainly is used in buildings that lack wireless internet, but it also is an option for people who prefer to be connected via a cable at all times. A wired USB network adapter essentially is a cord with a USB connection on one end and a networking cable connection on the other. It's particularly useful for computers that do not have a networking cable port.

There are quite a few different adapters created by various companies, but they all serve the same purpose. One of the main differences in the adapters lies in the operating system for which they are formatted. Most require a simple driver download before they are ready, but others work only with specific operating systems.

After the USB network adapter is plugged into the computer, there typically is little more required than simply to leave it plugged in. There normally will be a disc that comes with it that will run a quick installation of the adapter's required software. At this point, the adapter must remain plugged in at all times in order for the computer to maintain a connection to the wireless network.

The USB network adapter does not require a power cable, because it draws power from the computer to which it is connected. Some adapters come with separate antennas, and it's important to place them where they can pick up the strongest wireless signal. The antenna must be near the computer, but it should be placed away from walls and not in a place where the monitor or computer will block or interrupt the wireless signal.


The Linux USB gadget sub-system supports USB device functionality, including USB networking.

  • 10Debugging and resolving common errors

Configure hardware for USB OTG or USB device support

Depending on your hardware, you can use either USB OTG or USB device to enable support for USB networking.

  • DM365 - How to configure DM365 for USB host, device and OTG support

Build USB Ethernet network gadget driver

The USB Ethernet network gadget driver caused the device to appear to be a USB network dongle when connected to a host computer. Generally it is best to build USB gadget drivers as modules instead of building them into the kernel so you can unload one and load another.

If you want the target to mount a host PC directory using NFS, then also enable NFS mount support in busybox:

Build the SDK and install the new images to the target hardware.

Load USB Ethernet network gadget driver

After booting the target hardware to a shell prompt, run:

and you should see output similar to:

You can then verify the usb0 network interface exists:

with output similar to:

Connect device to host PC

Before connecting the target device to the host PC, watch the syslog, by running the following command on the host PC:

Connect the USB cable between the target device and the host PC. The messages file on the host PC should indicate the new USB device was detected.

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On the host you can verify the new usb0 interface exists by running:

with the output being similar to:

When you connect the cable, in the target device console, you should see:

Assigning IP addresses

For this simple example, fixed IP addresses are assigned to the both the host PC USB network interface and the target device USB network interface.

On the host

with an entry from the route output that looks like

On the target device

with the route showing the default gateway is using usb0

Verifying network connectivity

On the target device, ping the host PC:

On the host PC, verify the number of packet sent and received is not zero

Look at the values of RX packets: and TX packets:.

Bridging host PC to allow device to reach the Internet

If your host PC is connected to the Internet (through WiFi or Ethernet), then you can allow the target device to share the host PC's Internet connection. The following shows how to enable, test, and disable. It only works if your host PC doesn't have a firewall enable. There is a lot of information on how the Internet giving more detailed explanation.

On the host PC:

And then for reasons I don't fully undestand, I had to configure usb0 on the host again:

On the target device:

To disable forwarding network packets on your host PC:

Configuring a DNS name server

If you need to resolve DNS names, you can configure your target hardware to use Google's DNS server via:

and you can test that names get resolved by pinging some computer on the Internet:

Mounting NFS file system

If you have already enabled NFS share of your development directory target file system, $DEVDIR/fs/fs, then you can easily mount the file system on the target. This is different than a root NFS mount. With a root NFS mount, networking has to be available when the kernel is booting. With a normal (non root file system) NFS mount, you are simply mounting a shared directory somewhere in the target device's file system.

First verify you build the target file system kernel with NFS enabled:

with expected output

Mount host file system on target:

Debugging and resolving common errors

Wireshark

Wireshark is your friend. Run wireshark on your host PC monitoring the usb0 interface and you don't need any packet filters. If something isn't working, you will see the last packet that was sent and not responded to. That will give you a big hint as to where to start looking for the problem.

NFS mount failed reason given by server: Permission denied

If you see a message like

and you know you have root NFS working, the cause is due to a different sub-LAN address being used. On your host PC, you need to make sure the 10.0.1.* sub-LAN is exported. Run the following commands to export you home directory to all computers on this sub-LAN:

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