Dropped udp packets on the wireless N connected to airport extreme ver 7.5.2

[blwegrzyn]

I have a aiport extreme ver 7.5.2 AP and Imac Leopard 10.6.6.
When I watch videos on you tube or I use skype or any other voip software the video freezes every 10sec or so. I performed some test with iperf to see if I have packets dropped on wired compared to wireless. It looks like only on wireless network according to iperf there is lost every 10sec or so like i experience on youtube or skype. If I switch to wired everything is perfect.
See below for the results of the test.
Anyone experiences something like that on the wireless on mac?
I tried different AP - Asus (wireless N) and I experienced same issue.
But wired is perfect.
Is it the issue of Wireless card in Mac?


below are test result showing packet lost on server listening for iperf traffic:

through wirless N:
root@lexoncom ~# iperf -s -u -i 1
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size: 108 KByte (default)

3 local 192.168.1.253 port 5001 connected with 192.168.1.244 port 61102
ID Interval Transfer Bandwidth Jitter Lost/Total Datagrams
3 0.0- 1.0 sec 1.27 MBytes 10.6 Mbits/sec 0.328 ms 749/ 1653 (45%)
3 1.0- 2.0 sec 1.19 MBytes 10.0 Mbits/sec 0.017 ms 0/ 851 (0%)
3 2.0- 3.0 sec 1.19 MBytes 10.0 Mbits/sec 0.202 ms 0/ 851 (0%)
3 3.0- 4.0 sec 1.19 MBytes 10.0 Mbits/sec 0.029 ms 0/ 850 (0%)
3 4.0- 5.0 sec 1.19 MBytes 10.0 Mbits/sec 0.089 ms 0/ 851 (0%)
3 5.0- 6.0 sec 1.19 MBytes 10.0 Mbits/sec 0.010 ms 0/ 850 (0%)
3 6.0- 7.0 sec 1.19 MBytes 10.0 Mbits/sec 0.014 ms 0/ 851 (0%)
3 7.0- 8.0 sec 1.19 MBytes 10.0 Mbits/sec 0.021 ms 0/ 851 (0%)
3 8.0- 9.0 sec 1.19 MBytes 10.0 Mbits/sec 0.033 ms 0/ 850 (0%)
3 0.0- 9.1 sec 10.9 MBytes 10.1 Mbits/sec 0.015 ms 748/ 8504 (8.8%)
3 0.0- 9.1 sec 1 datagrams received out-of-order
4 local 192.168.1.253 port 5001 connected with 192.168.1.244 port 61032
4 0.0- 1.0 sec 1.26 MBytes 10.6 Mbits/sec 0.029 ms 249/ 1151 (22%)
4 1.0- 2.0 sec 1.19 MBytes 10.0 Mbits/sec 0.072 ms 0/ 850 (0%)
4 2.0- 3.0 sec 1.19 MBytes 10.0 Mbits/sec 0.122 ms 0/ 851 (0%)
4 3.0- 4.0 sec 1.19 MBytes 10.0 Mbits/sec 0.119 ms 0/ 850 (0%)
4 4.0- 5.0 sec 1.19 MBytes 10.0 Mbits/sec 0.032 ms 0/ 850 (0%)
4 5.0- 6.0 sec 1.19 MBytes 10.0 Mbits/sec 0.017 ms 0/ 852 (0%)
4 6.0- 7.0 sec 1.19 MBytes 10.0 Mbits/sec 0.032 ms 0/ 850 (0%)
4 7.0- 8.0 sec 1.19 MBytes 10.0 Mbits/sec 0.111 ms 0/ 851 (0%)
4 8.0- 9.0 sec 1.19 MBytes 10.0 Mbits/sec 0.180 ms 0/ 850 (0%)
4 9.0-10.0 sec 1.19 MBytes 10.0 Mbits/sec 0.041 ms 0/ 851 (0%)
4 10.0-11.0 sec 1.44 KBytes 11.8 Kbits/sec 0.040 ms 0/ 1 (0%)
4 11.0-12.0 sec 0.00 Bytes 0.00 bits/sec 0.040 ms 0/ 0 (nan%)
4 12.0-13.0 sec 0.00 Bytes 0.00 bits/sec 0.040 ms 0/ 0 (nan%)
4 13.0-14.0 sec 1.17 MBytes 9.80 Mbits/sec 0.114 ms 2569/ 3402 (76%)
4 14.0-15.0 sec 1.19 MBytes 10.0 Mbits/sec 0.017 ms 0/ 850 (0%)
4 15.0-16.0 sec 1.19 MBytes 10.0 Mbits/sec 0.035 ms 0/ 851 (0%)
4 16.0-17.0 sec 1.19 MBytes 10.0 Mbits/sec 0.107 ms 0/ 850 (0%)
4 17.0-18.0 sec 1.19 MBytes 10.0 Mbits/sec 0.089 ms 0/ 851 (0%)
4 18.0-19.0 sec 1.19 MBytes 10.0 Mbits/sec 0.029 ms 0/ 851 (0%)
4 19.0-20.0 sec 1.19 MBytes 10.0 Mbits/sec 0.073 ms 0/ 850 (0%)
4 20.0-21.0 sec 1.19 MBytes 10.0 Mbits/sec 0.235 ms 0/ 851 (0%)
4 21.0-22.0 sec 1.19 MBytes 9.98 Mbits/sec 0.176 ms 0/ 849 (0%)
4 22.0-23.0 sec 1.19 MBytes 10.0 Mbits/sec 0.042 ms 0/ 852 (0%)
4 23.0-24.0 sec 109 KBytes 894 Kbits/sec 0.014 ms 0/ 76 (0%)
4 24.0-25.0 sec 0.00 Bytes 0.00 bits/sec 0.014 ms 0/ 0 (nan%)
4 25.0-26.0 sec 0.00 Bytes 0.00 bits/sec 0.014 ms 0/ 0 (nan%)
4 26.0-27.0 sec 1.05 MBytes 8.84 Mbits/sec 0.063 ms 2575/ 3327 (77%)
4 27.0-28.0 sec 1.19 MBytes 10.0 Mbits/sec 0.021 ms 0/ 850 (0%)
4 28.0-29.0 sec 1.19 MBytes 10.0 Mbits/sec 0.133 ms 0/ 851 (0%)
4 29.0-30.0 sec 1.19 MBytes 10.0 Mbits/sec 0.186 ms 0/ 851 (0%)
4 30.0-31.0 sec 1.19 MBytes 10.0 Mbits/sec 0.019 ms 0/ 850 (0%)
4 31.0-32.0 sec 1.19 MBytes 10.0 Mbits/sec 0.052 ms 0/ 851 (0%)
4 32.0-33.0 sec 1.19 MBytes 10.0 Mbits/sec 0.071 ms 0/ 850 (0%)
4 33.0-34.0 sec 1.19 MBytes 10.0 Mbits/sec 0.150 ms 0/ 851 (0%)
4 34.0-35.0 sec 1.19 MBytes 10.0 Mbits/sec 0.019 ms 0/ 851 (0%)
4 35.0-36.0 sec 1.19 MBytes 10.0 Mbits/sec 0.020 ms 0/ 850 (0%)
4 36.0-37.0 sec 225 KBytes 1.85 Mbits/sec 0.319 ms 0/ 157 (0%)
4 37.0-38.0 sec 0.00 Bytes 0.00 bits/sec 0.319 ms 0/ 0 (nan%)
4 38.0-39.0 sec 0.00 Bytes 0.00 bits/sec 0.319 ms 0/ 0 (nan%)
4 39.0-40.0 sec 972 KBytes 7.96 Mbits/sec 0.200 ms 2569/ 3246 (79%)
4 40.0-41.0 sec 1.19 MBytes 10.0 Mbits/sec 0.064 ms 0/ 850 (0%)
4 41.0-42.0 sec 1.19 MBytes 10.0 Mbits/sec 0.062 ms 0/ 851 (0%)
4 42.0-43.0 sec 1.19 MBytes 10.0 Mbits/sec 0.131 ms 0/ 850 (0%)
4 43.0-44.0 sec 1.19 MBytes 10.0 Mbits/sec 0.023 ms 0/ 851 (0%)
4 44.0-45.0 sec 1.19 MBytes 10.0 Mbits/sec 0.039 ms 0/ 851 (0%)
4 45.0-46.0 sec 1.19 MBytes 10.0 Mbits/sec 0.032 ms 0/ 850 (0%)
4 46.0-47.0 sec 1.19 MBytes 10.0 Mbits/sec 0.123 ms 0/ 851 (0%)
4 47.0-48.0 sec 1.19 MBytes 10.0 Mbits/sec 0.013 ms 0/ 851 (0%)
4 48.0-49.0 sec 1.19 MBytes 10.0 Mbits/sec 0.080 ms 0/ 850 (0%)
4 49.0-50.0 sec 333 KBytes 2.73 Mbits/sec 0.076 ms 0/ 232 (0%)
4 50.0-51.0 sec 0.00 Bytes 0.00 bits/sec 0.076 ms 0/ 0 (nan%)
4 51.0-52.0 sec 0.00 Bytes 0.00 bits/sec 0.076 ms 0/ 0 (nan%)
4 52.0-53.0 sec 857 KBytes 7.02 Mbits/sec 0.022 ms 2574/ 3171 (81%)
4 53.0-54.0 sec 1.19 MBytes 10.0 Mbits/sec 0.095 ms 0/ 850 (0%)
4 54.0-55.0 sec 1.19 MBytes 10.0 Mbits/sec 0.063 ms 0/ 851 (0%)
4 55.0-56.0 sec 1.19 MBytes 10.0 Mbits/sec 0.261 ms 0/ 851 (0%)
4 56.0-57.0 sec 1.19 MBytes 10.0 Mbits/sec 0.019 ms 0/ 850 (0%)
4 57.0-58.0 sec 1.19 MBytes 10.0 Mbits/sec 0.024 ms 0/ 851 (0%)
4 58.0-59.0 sec 1.19 MBytes 10.0 Mbits/sec 0.035 ms 0/ 850 (0%)
4 0.0-59.6 sec 56.8 MBytes 7.98 Mbits/sec 0.055 ms 10536/51022 (21%)

through wiredconnected to airport extreme port)
4 local 192.168.1.253 port 5001 connected with 192.168.1.142 port 55626
4 0.0- 1.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 850 (0%)
4 1.0- 2.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 2.0- 3.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 3.0- 4.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 4.0- 5.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 851 (0%)
4 5.0- 6.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 850 (0%)
4 6.0- 7.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 7.0- 8.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 8.0- 9.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 9.0-10.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 10.0-11.0 sec 1.19 MBytes 10.0 Mbits/sec 0.002 ms 0/ 851 (0%)
4 11.0-12.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 850 (0%)
4 12.0-13.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 13.0-14.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 850 (0%)
4 14.0-15.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 851 (0%)
4 15.0-16.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 16.0-17.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 850 (0%)
4 17.0-18.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 18.0-19.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 19.0-20.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 851 (0%)
4 20.0-21.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 21.0-22.0 sec 1.19 MBytes 10.0 Mbits/sec 0.007 ms 0/ 850 (0%)
4 22.0-23.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 23.0-24.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 24.0-25.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 850 (0%)
4 25.0-26.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 26.0-27.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 850 (0%)
4 27.0-28.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 28.0-29.0 sec 1.19 MBytes 10.0 Mbits/sec 0.007 ms 0/ 851 (0%)
4 29.0-30.0 sec 1.19 MBytes 10.0 Mbits/sec 0.009 ms 0/ 850 (0%)
4 30.0-31.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 851 (0%)
4 31.0-32.0 sec 1.19 MBytes 10.0 Mbits/sec 0.002 ms 0/ 851 (0%)
4 32.0-33.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 33.0-34.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 851 (0%)
4 34.0-35.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 35.0-36.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 36.0-37.0 sec 1.19 MBytes 10.0 Mbits/sec 0.007 ms 0/ 851 (0%)
4 37.0-38.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 38.0-39.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 851 (0%)
4 39.0-40.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 851 (0%)
4 40.0-41.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 850 (0%)
4 41.0-42.0 sec 1.19 MBytes 10.0 Mbits/sec 0.009 ms 0/ 851 (0%)
4 42.0-43.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 850 (0%)
4 43.0-44.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 44.0-45.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 45.0-46.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 850 (0%)
4 46.0-47.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 47.0-48.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 48.0-49.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 850 (0%)
4 49.0-50.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 50.0-51.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 850 (0%)
4 51.0-52.0 sec 1.19 MBytes 10.0 Mbits/sec 0.005 ms 0/ 851 (0%)
4 52.0-53.0 sec 1.19 MBytes 10.0 Mbits/sec 0.004 ms 0/ 851 (0%)
4 53.0-54.0 sec 1.19 MBytes 10.0 Mbits/sec 0.006 ms 0/ 850 (0%)
4 54.0-55.0 sec 1.19 MBytes 10.0 Mbits/sec 0.003 ms 0/ 851 (0%)
4 0.0-55.8 sec 66.5 MBytes 10.0 Mbits/sec 0.010 ms 0/47467 (0%)

 

[Satcomer]

Please post the wireless N frequency and any security settings in that Airport Extreme.

 

[blwegrzyn]

802.11n
channel 149.1
wpa2 personal
signal/noise -53dbm / -96dbm
transmit rate 300
msc index 15

 

[Satcomer]

Try a different channel. Your Rates are way lower than mine on my Mac Pro. This Mac doesn't have even an eternal antenna.

 

[blwegrzyn]

as far as i know 300 is pretty good
the 10M rate was set manually just for the test

 

[Satcomer]

The point I was trying to make is first try to Reset the SMC to see if it helps. Plus try a different channel on the wireless signal because someone of a new cordless 5G phone might be causing interference.

 

[blwegrzyn]

downgrading the firmware to 7.5.1
fixed the issue:

[root@lexoncom ~]# iperf -s -u -i 1
------------------------------------------------------------
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size: 108 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.1.253 port 5001 connected with 192.168.1.244 port 49553
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 3] 0.0- 1.0 sec 1.19 MBytes 10.0 Mbits/sec 0.098 ms 0/ 850 (0%)
[ 3] 1.0- 2.0 sec 1.19 MBytes 10.0 Mbits/sec 0.090 ms 0/ 850 (0%)
[ 3] 2.0- 3.0 sec 1.19 MBytes 10.0 Mbits/sec 0.356 ms 0/ 851 (0%)
[ 3] 3.0- 4.0 sec 1.19 MBytes 10.0 Mbits/sec 0.045 ms 0/ 851 (0%)
[ 3] 4.0- 5.0 sec 1.19 MBytes 10.0 Mbits/sec 0.109 ms 0/ 851 (0%)
[ 3] 5.0- 6.0 sec 1.19 MBytes 10.0 Mbits/sec 0.224 ms 0/ 850 (0%)
[ 3] 6.0- 7.0 sec 1.19 MBytes 10.0 Mbits/sec 0.180 ms 0/ 851 (0%)
[ 3] 7.0- 8.0 sec 1.19 MBytes 9.98 Mbits/sec 0.022 ms 0/ 849 (0%)
[ 3] 8.0- 9.0 sec 1.19 MBytes 10.0 Mbits/sec 0.068 ms 0/ 852 (0%)
[ 3] 9.0-10.0 sec 1.19 MBytes 10.0 Mbits/sec 0.075 ms 0/ 851 (0%)
[ 3] 10.0-11.0 sec 1.19 MBytes 10.0 Mbits/sec 0.114 ms 0/ 850 (0%)
[ 3] 11.0-12.0 sec 1.19 MBytes 10.0 Mbits/sec 0.210 ms 0/ 850 (0%)
[ 3] 12.0-13.0 sec 1.19 MBytes 10.0 Mbits/sec 0.060 ms 0/ 852 (0%)
[ 3] 13.0-14.0 sec 1.19 MBytes 10.0 Mbits/sec 0.137 ms 0/ 850 (0%)
[ 3] 14.0-15.0 sec 1.19 MBytes 10.0 Mbits/sec 0.112 ms 0/ 851 (0%)
[ 3] 15.0-16.0 sec 1.19 MBytes 10.0 Mbits/sec 0.385 ms 0/ 850 (0%)
[ 3] 16.0-17.0 sec 1.19 MBytes 10.0 Mbits/sec 0.071 ms 0/ 851 (0%)
[ 3] 17.0-18.0 sec 1.19 MBytes 10.0 Mbits/sec 0.098 ms 0/ 851 (0%)
[ 3] 18.0-19.0 sec 1.19 MBytes 10.0 Mbits/sec 0.265 ms 0/ 850 (0%)
[ 3] 19.0-20.0 sec 1.19 MBytes 10.0 Mbits/sec 0.264 ms 0/ 851 (0%)
[ 3] 20.0-21.0 sec 1.19 MBytes 10.0 Mbits/sec 0.049 ms 0/ 851 (0%)
[ 3] 21.0-22.0 sec 1.19 MBytes 10.0 Mbits/sec 0.154 ms 0/ 850 (0%)
[ 3] 22.0-23.0 sec 1.19 MBytes 10.0 Mbits/sec 0.206 ms 0/ 851 (0%)
[ 3] 23.0-24.0 sec 1.19 MBytes 10.0 Mbits/sec 0.229 ms 0/ 850 (0%)
[ 3] 24.0-25.0 sec 1.19 MBytes 10.0 Mbits/sec 0.124 ms 0/ 850 (0%)
[ 3] 25.0-26.0 sec 1.19 MBytes 10.0 Mbits/sec 0.085 ms 0/ 852 (0%)
[ 3] 26.0-27.0 sec 1.19 MBytes 10.0 Mbits/sec 0.174 ms 0/ 850 (0%)
[ 3] 27.0-28.0 sec 1.19 MBytes 10.0 Mbits/sec 0.086 ms 0/ 851 (0%)
[ 3] 28.0-29.0 sec 1.19 MBytes 9.98 Mbits/sec 0.588 ms 0/ 849 (0%)