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Я тестирую Iperf не удалось

На моем сервере (CentOS7.2, адрес 103.193.202.2), Я запускаю iperf сервер:

# iperf -u -s
------------------------------------------------------------
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------

На моем Mac я использую следующую команду для тестирования моего сервера.

$ iperf -u -c  103.193.202.2 -b 100M -P 5 
------------------------------------------------------------
Client connecting to 103.193.242.2, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------
[  7] local 192.168.1.3 port 58906 connected with 103.193.242.2 port 5001
[  6] local 192.168.1.3 port 63984 connected with 103.193.242.2 port 5001
[  4] local 192.168.1.3 port 62739 connected with 103.193.242.2 port 5001
[  5] local 192.168.1.3 port 62128 connected with 103.193.242.2 port 5001
[  8] local 192.168.1.3 port 59654 connected with 103.193.242.2 port 5001
[ ID] Interval       Transfer     Bandwidth
[  7]  0.0-10.0 sec  4.42 MBytes  3.70 Mbits/sec
[  7] Sent 85471 datagrams
[  6]  0.0-10.0 sec  7.36 MBytes  6.17 Mbits/sec
[  6] Sent 85470 datagrams
[  4]  0.0-10.0 sec  4.41 MBytes  3.70 Mbits/sec
[  4] Sent 85470 datagrams
[  5]  0.0-10.0 sec  7.46 MBytes  6.25 Mbits/sec
[  5] Sent 85468 datagrams
[  8]  0.0-10.0 sec  8.22 MBytes  6.89 Mbits/sec
[  8] Sent 85469 datagrams
[SUM]  0.0-10.0 sec  31.9 MBytes  26.7 Mbits/sec
[  4] WARNING: did not receive ack of last datagram after 10 tries.
[  8] WARNING: did not receive ack of last datagram after 10 tries.
[  6] WARNING: did not receive ack of last datagram after 10 tries.
[  7] WARNING: did not receive ack of last datagram after 10 tries.
[  5] WARNING: did not receive ack of last datagram after 10 tries.

Вы видите, что в моем Mac идет WARNING: did not receive ack of last datagram after 10 tries. И на моем Сервере у меня тоже не было распечаток. Почему я провалил тест?