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priority: 290 # Must be run before any interfaces are configured
help: Disable IPv6 operation on interface when DAD fails on LL addr
# Enable strict DAD behavior. Disable IPv6 operation on an interface
# if DAD fails on the EUI-64 based link-local address.
#
create:
sudo sh -c "echo 2 > /proc/sys/net/ipv6/conf/all/accept_dad"
sudo sh -c "echo 2 > /proc/sys/net/ipv6/conf/default/accept_dad"
for ifname in /sys/class/net/eth* ; do
if [ -d $ifname ]; then
ifname=${ifname#/sys/class/net/}
sudo sh -c "echo 2 > /proc/sys/net/ipv6/conf/$ifname/accept_dad"
fi
done
# Revert back to liberal DAD behavior
delete:
sudo sh -c "echo 1 > /proc/sys/net/ipv6/conf/all/accept_dad"
sudo sh -c "echo 1 > /proc/sys/net/ipv6/conf/default/accept_dad"
for ifname in /sys/class/net/eth* /sys/class/net/en* ; do
if [ -d $ifname ]; then
ifname=${ifname#/sys/class/net/}
sudo sh -c "echo 1 > /proc/sys/net/ipv6/conf/$ifname/accept_dad"
fi
done
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