Beyond the Basics - BeagleBone - page 327

echo "to enable forwarding of packets. Then run the following:"
echo "$ sudo sysctl -p"
exit 1
else
echo "IP forwarding is set on host."
fi
# Set up IP masquerading on the host so the bone can reach the outside
world
sudo iptables - t nat - A POSTROUTING - s $beagleAddr - o $interface - j
MASQUERADE
Then, on your host, run the following commands:
host$ chmod +x ipMasquerade.sh
host$ ./ipMasquerade.sh eth0
This will direct your host to take requests from the Bone and send them to eth0 . If your
host is using a wireless connection, change eth0 to wlan0 .
Now let's set up your host to instruct the Bone what to do. Add the code in Example 5-2
to setDNS.sh on your host computer.
Example 5-2. Code for setting the DNS on the Bone (setDNS.sh)
#!/bin/bash
# These are the commands to run on the host so the Bone
# can access the Internet through the USB connection .
# Run ./ ipMasquerade . sh the first time . It will set up the host .
# Run this script if the host is already set up .
hostAddr = 192.168 . 7.1
beagleAddr = 192.168 . 7.2
# Save the / etc / resolv . conf on the Bone in case we mess things up .
ssh root @ $beagleAddr "mv -n /etc/resolv.conf /etc/resolv.conf.orig"
# Create our own resolv . conf
cat - << EOF > /tmp/resolv.conf
# This is installed by host . setDNS . sh on the host
EOF
# Look up the nameserver of the host and add it to our resolv . conf
nmcli dev list | grep IP4 . DNS | sed 's/IP4.DNS\[.\]:/nameserver/' >>
/tmp/resolv.conf
scp / tmp / resolv . conf root @ $beagleAddr : /etc