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#!/bin/sh
# 6 seconds maximum wait time
attempts=${IF_DAD_ATTEMPTS:-60}
delay=${IF_DAD_INTERVAL:-0.1}
[ $attempts -eq 0 ] && exit 0
echo -n "Waiting for DAD... "
for attempt in $(seq 1 $attempts); do
tentative=$(ip -o -6 address list dev "$IFACE" to "${IF_ADDRESS}/${IF_NETMASK}" tentative | wc -l)
if [ $tentative -eq 0 ]; then
attempt=0 # This might have been our last attempt, but successful
break
fi
sleep $delay
done
if [ $attempt -eq $attempts ]; then
echo "Timed out"
exit 1
fi
dadfailed=$(ip -o -6 address list dev "$IFACE" to "${IF_ADDRESS}/${IF_NETMASK}" dadfailed | wc -l)
if [ $dadfailed -ge 1 ]; then
echo "Failed"
exit 1
fi
echo Done