This file is indexed.

/etc/ppp/ip-up.d/netscript is in netscript-2.4 5.3.0ubuntu1.

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
[ ! -x /sbin/tc ] && exit 0
. /etc/netscript/network.conf
. /etc/netscript/qos.conf

ip_QoSppp $PPP_IFACE
ip_QoS $PPP_IFACE

eval TXQLEN=\${"$PPP_IFACE"_TXQLEN:-""}
[ -z "$TXQLEN" ] && eval TXQLEN=\${ppp_TXQLEN:-""}
[ -n "$TXQLEN" ] \
	&& ip link set dev $PPP_IFACE txqlen $TXQLEN