This file is indexed.

/etc/freeradius/3.0/sites-available/dhcp.relay is in freeradius-config 3.0.16+dfsg-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# -*- text -*-
######################################################################
#
#	This is a virtual server that handles DHCP relaying
#
#	Only one server can listen on a socket, so you cannot
#	do DHCP relaying && run a DHCP server at the same time.
#
######################################################################

server dhcp.eth1 {
	listen {
		ipaddr = *
		port = 67
		type = dhcp
		interface = eth1
	}

	#  Packets received on the socket will be processed through one
	#  of the following sections, named after the DHCP packet type.
	#  See dictionary.dhcp for the packet types.
	dhcp DHCP-Discover {
		update config {
			# IP Address of the DHCP server
			&DHCP-Relay-To-IP-Address := 192.0.2.2
		}
		update request {
			# IP Address of the DHCP relay (ourselves)
			&DHCP-Gateway-IP-Address := 192.0.2.1
		}
		ok
	}

	dhcp DHCP-Request {
		update config {
			# IP Address of the DHCP server
			&DHCP-Relay-To-IP-Address := 192.0.2.2
		}
		update request {
			&DHCP-Gateway-IP-Address := 192.0.2.2
		}
		ok
	}
}