This file is indexed.

/etc/default/isc-dhcp-relay6 is in isc-dhcp-relay 4.1.ESV-R4-0ubuntu5.

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# Defaults for isc-dhcp-relay6 initscript
# sourced by /etc/init/isc-dhcp-relay6.conf

#
# This is a POSIX shell fragment
#

# What interfaces should the DHCP relay forward requests to?
UPPER_INTERFACES=""

# On what interfaces should the DHCP relay (dhrelay) serve DHCP requests?
LOWER_INTERFACES=""

# Additional options that are passed to the DHCP relay daemon?
OPTIONS=""