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I’m trying to turn a Pi-Zero W into a USB WiFi dongle but have not found any instructions or much about the possibility. What I have tried hasn’t worked. Now I wonder if it is even possible to route packets to the usb port. Am I wasting my time? Can anyone clear this up?

  • Do you realise you can but a USB WiFi dongle for less than the price of a Pi? – Milliways Dec 8 '19 at 3:05
  • This is not about cost, it is about size and capability. – Gnarlodious Dec 8 '19 at 3:41
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    Dongles are smaller and more capable – Milliways Dec 8 '19 at 5:14
  • Could you explain in more detail what you try to achieve. You want that your raspberry behaves like a USB network device on the USB side? And on the Wifi side shall it act like a WLAN access point or like a Wifi client connecting to a predefined access point? – gelonida Dec 8 '19 at 12:03
  • Yes, that is exactly right. I have the Pi-Zero configured as a USB “RNDIS gadget” and also connected to my WiFi AP, and figure I might as well add WiFi packet routing to usb0. – Gnarlodious Dec 9 '19 at 2:37
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I do not have a Raspberry Pi Zero W available but you can use ethernet gadget mode. Then the usb0 interface behaves like a normal network interface and you can enable ip forwarding. This will forward network traffic between the available network interfaces, in your case wlan0 and usb0. You can enable it with:

rpi ~$ echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward
# check with:
rpi ~$ cat /proc/sys/net/ipv4/ip_forward

but this setting is lost on next bootup. To have it persistent you can set it in /etc/sysctl.conf. There you have to uncomment the line:

#net.ipv4.ip_forward=1

It is possible that you also have to add/modify the routing table for your configuration to get traffic routed between the networks that the interfaces are connected to.

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