howto share inet usb howto

Sharing internet using Network-Over-USB

https://elementztechblog.wordpress.com/2014/12/22/sharing-internet-using-network-over-usb-in-beaglebone-black/

SSH to BB

sudo ip addr add 192.168.7.1/30 dev eth4
ssh [email protected]

On BB

# add default route to the host
ip route add default via 192.168.7.1

On host (desktop)

• find using ip addr name of interface with address 192.168.7.1. It is eth6 in my case
• find interface providing the internet access. It is wlan0 in my case, can be ppp0 or different, if one is using VPN.

make-nat.sh eth6 wlan0

make-nat.sh

#!/bin/sh

help_exit()
{
	echo $0 "LAN_interface WAN_interface"
	echo "Example: " $0 " eth6 wlan0"
	exit 1
}

IF_IN=$1
if [ -z $IF_IN ]; then 
	help_exit
fi

IF_OUT=$2
if [ -z $IF_OUT ]; then 
	help_exit
fi

# forward NAT packets to the interface wlan0
sudo iptables --table nat --append POSTROUTING --out-interface $IF_OUT -j MASQUERADE
# accept packet forwarding from interface eth6
sudo iptables --append FORWARD --in-interface $IF_IN -j ACCEPT
# enable packet forwarding in system
echo "1" | sudo tee /proc/sys/net/ipv4/ip_forward 1>/dev/null

Now you are able to test internet connection on BB

ping 8.8.8.8
ping google.com

You might have to add DNS addres to resolv.conf

echo "nameserver 8.8.8.8" >> /etc/resolv.conf

echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf 1>/dev/null