WARNING: did not receive ack of last datagram after 10 tries.


WARNING: did not receive ack of last datagram after 10 tries.

Often get this warning on the Client side.

Client
# iperf -c kp2a.vi -u -b 2m -p 5000
------------------------------------------------------------
Client connecting to kp2a.vi, UDP port 5000
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------
[  5] local 172.17.254.20 port 2134 connected with 204.11.154.244 port 5000
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec  2.39 MBytes  2.00 Mbits/sec
[  5] WARNING: did not receive ack of last datagram after 10 tries.
[  5] Sent 1702 datagrams
# iperf -v
iperf version 1.7.0 (13 Mar 2003) pthreads

Server:
iperf -s -u -p 5000
--------------------------------------------------
Server listening on UDP port 5000
Receiving 1470 byte datagrams
UDP buffer size: 64.0 KByte (default)
------------------------------------------------------------
[ 3] local 204.11.154.244 port 5000 connected with 204.11.152.181 port 63736
[ 3] 0.0-10.0 sec 2.38 MBytes 2.00 Mbits/sec 0.859 ms 4/ 1702 (0.24%)
# iperf -v
iperf version 2.0.2 (03 May 2005) pthreads


What is the meaning and cure of this warning?
TIA





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