This file is indexed.

/etc/ppp/ip-down.d/isatapd is in isatapd 0.9.6-2.

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 -e

if [ -f /etc/default/isatapd ]; then
	. /etc/default/isatapd
fi

if [ "$RELOAD_ON_IFUPDOWN" = "yes" ]; then
	if invoke-rc.d isatapd status > /dev/null; then
		if [ "$RELOAD_ON_IFUPDOWN_DELAY" ]; then
			sleep $RELOAD_ON_IFUPDOWN_DELAY
		fi
		invoke-rc.d isatapd reload
	fi
fi