USB Ethernet Configuration Script for Raspberry Pi Zero. Source: http://www.circuitbasics.com/raspberry-pi-zero-ethernet-gadget/

install.sh

#!/bin/bash
# Installation Script for usb_ethserv
set -eo pipefail

CONF_URL="https://gist.github.com/sr229/6950ab77a7fb5a6b6fc0891a2a398229/raw/2578e785ab9617f6909799f757e0a9014db45f7a/usb_ethserv"

if [ -z $(command -v wget) ]; then
  echo "Setup requires wget"
  exit 0
fi

if [ -f "/usr/bin/usb_ethserv"]; then
  echo "Already installed. Not continuing."
  exit 0
fi

echo "Running preinstall. Please be patient"

if [ -z $(cat /boot/config.txt | cat dtoverlay=dwc2) ];  then
  echo "dtoverlay=dwc2" | sudo tee -a /boot/config.txt
  echo "dwc2" | sudo tee -a /etc/modules
fi

sudo echo "libcomposite" | sudo tee -a /etc/modules

echo "Installing script to /usr/bin"

wget -qO - $CONF_URL > /usr/bin/usb_ethserv && chmod -R 755 /usr/bin/usb_ethserv

echo "Adding Script to rc.local (Required so it starts everytime you plug your Raspberry)"

# Remove exit from its line first
sed -e "s/exit//\usr/bin/usb_ethserv/g" > /etc/rc.local
# Then add it back
echo "exit" >> /etc/rc.local

echo "Configuration installed."
exit 0

usb_ethserv

#!/bin/bash
cd /sys/kernel/config/usb_gadget/
mkdir -p rpi-usb
cd rpi-usb
echo 0x1d6b > idVendor # Linux Foundation
echo 0x0104 > idProduct # Multifunction Composite Gadget
echo 0x0100 > bcdDevice # v1.0.0
echo 0x0200 > bcdUSB # USB2
mkdir -p strings/0x409
echo "fedcba9876543210" > strings/0x409/serialnumber
echo "Ayane Satomi" > strings/0x409/manufacturer
echo "Raspberry Pi Zero W Ethernet over USB" > strings/0x409/product
mkdir -p configs/c.1/strings/0x409
echo "Config 1: ECM network" > configs/c.1/strings/0x409/configuration
echo 250 > configs/c.1/MaxPower
# Add functions here

mkdir -p functions/ecm.usb0
# first byte of address must be even
HOST="48:6f:73:74:50:43" # "HostPC"
SELF="42:61:64:55:53:42" # "BadUSB"
echo $HOST > functions/ecm.usb0/host_addr
echo $SELF > functions/ecm.usb0/dev_addr
ln -s functions/ecm.usb0 configs/c.1/

# End functions
ls /sys/class/udc > UDC

ifconfig usb0 10.0.0.1 netmask 255.255.255.252 up
route add -net default gw 10.0.0.2