This file is indexed.

/etc/ppp/ipv6-down is in ppp 2.4.5-5.1ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# These variables are for the use of the scripts run by run-parts.
PPP_IFACE="$1"
PPP_TTY="$2"
PPP_SPEED="$3"
PPP_LOCAL="$4"
PPP_REMOTE="$5"
PPP_IPPARAM="$6"
export PPP_IFACE PPP_TTY PPP_SPEED PPP_LOCAL PPP_REMOTE PPP_IPPARAM

# The environment is cleared before executing this script.
PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin
export PATH

# If /var/log/ppp-ipupdown.log exists use it for logging.
if [ -e /var/log/ppp-ipupdown.log ]; then
  exec >> /var/log/ppp-ipupdown.log 2>&1
fi

# This script can be used to override the .d files supplied by other packages.
if [ -x /etc/ppp/ipv6-down.local ]; then
  exec /etc/ppp/ipv6-down.local "$@"
fi

run-parts /etc/ppp/ipv6-down.d \
  --arg="$1" --arg="$2" --arg="$3" --arg="$4" --arg="$5" --arg="$6"