/usr/share/doc/ppp/examples/scripts/ipv6-down.sample is in ppp 2.4.5-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #!/bin/sh
#
# This script is called with the following parameters:
# interface tty speed local-address remote-address ipparam
#
# Kill the router advertisement daemon on this interface.
# The killing procedure is copied from RedHat 6.0 initscripts.
DEVICE="$1"
PIDFILE="/var/run/radvd-$DEVICE.pid"
[ -f "$PIDFILE" ] || exit 0
PID="$(cat "$PIDFILE")"
if [ "$PID" != "" ]; then
if ps h "$PID" >/dev/null 2>&1; then
kill -TERM "$PID"
usleep 10000
if ps h "$PID" >/dev/null 2>&1; then
sleep 1
if ps h "$PID" >/dev/null 2>&1; then
kill -KILL "$PID"
fi
fi
fi
fi
rm -f "$PIDFILE"
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