Connect to a router by its MAC address (static IP).

connectMAC

#!/bin/bash
DEV="eth0"
ROUTER="192.168.0.1"
MAC="${1:-01:23:45:67:89:ab}"
IP="192.168.0.5/24"

if [[ "${UID}" != 0 ]]; then
	exec sudo "$0" $@
fi

echo -n "Stopping NetworkManager: "
stop network-manager

echo "Bringing up interface '$DEV'"
ip link set "$DEV" up

echo "Setting IP address to $IP"
ip addr add "$IP" dev "$DEV"

echo "Adding ARP entry: $ROUTER -> $MAC"
ip neigh add "$ROUTER" lladdr "$MAC" dev "$DEV"

echo "Adding default route via $ROUTER"
ip route add default via "$ROUTER"

echo "Adding Google nameservers (8.8.8.8 and 8.8.4.4)"
echo "nameserver 8.8.8.8
nameserver 8.8.4.4" > /etc/resolv.conf

echo "Testing internet by pinging Google:"
ping google.com -I "$DEV" -c 6 -i 0.2 -n