[Bug 220449] NetFlow v9 exports are without MAC addresses (ng_netflow)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220449

            Bug ID: 220449
           Summary: NetFlow v9 exports are without MAC addresses
                    (ng_netflow)
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: marian.hercek at gmail.com

MAC addresses (IN_SRC_MAC and OUT_DST_MAC fields) are omitted in NetFlow v9
exports.

Packet capture of sent Netflow template:

Cisco NetFlow/IPFIX
Version: 9
Count: 23
SysUptime: 1117945.000000000 seconds
Timestamp: Jun 28, 2017 09:12:41.000000000 Central Europe Daylight Time
FlowSequence: 11272
SourceId: 0
FlowSet 1 [id=0] (Data Template): 256,259
FlowSet Id: Data Template (V9) (0)
FlowSet Length: 172
Template (Id = 256, Count = 20)
Template Id: 256
Field Count: 20
Field (1/20): IP_SRC_ADDR
Field (2/20): IP_DST_ADDR
Field (3/20): IP_NEXT_HOP
Field (4/20): INPUT_SNMP
Field (5/20): OUTPUT_SNMP
Field (6/20): PKTS
Field (7/20): BYTES
Field (8/20): OUT_PKTS
Field (9/20): OUT_BYTES
Field (10/20): FIRST_SWITCHED
Field (11/20): LAST_SWITCHED
Field (12/20): L4_SRC_PORT
Field (13/20): L4_DST_PORT
Field (14/20): TCP_FLAGS
Field (15/20): PROTOCOL
Field (16/20): IP_TOS
Field (17/20): SRC_AS
Field (18/20): DST_AS
Field (19/20): SRC_MASK
Field (20/20): DST_MASK

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