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blufrog

macrumors 6502
Original poster
Dec 19, 2014
254
133
Hi,

Both my rMBP and iMac are both running the latest version of OS X.

I have an SSD connected to the iMac which is shared from the iMac, and accessed by the rMBP.

I'm trying to copy a 30 Gb virtual machine from the MBP to the iMac, but about half way through copying, either the MBP or iMac is dropping the network connection, and the copy is failing.

I've had problems between OS X and Windows, which I have managed to resolve by continuously pinging the Windows machine, but am I really expected to need to do this between two OS X computers?!

Why on earth is OS X dropping/closing an ACTIVE network connection in the first place?

Neither computer is sleeping, and neither computer is dropping its network connection.
[doublepost=1469310254][/doublepost]These are the ping stats from the MBP to the iMac. Both are connected via 5 GHz WiFi.

Code: 
Last login: Sat Jul 23 19:42:17 on ttys000

MacBook-Pro:~ User$ ping 172.16.0.4

PING 172.16.0.4 (172.16.0.4): 56 data bytes

Request timeout for icmp_seq 0

Request timeout for icmp_seq 1

Request timeout for icmp_seq 2

Request timeout for icmp_seq 3

Request timeout for icmp_seq 4

Request timeout for icmp_seq 5

Request timeout for icmp_seq 6

Request timeout for icmp_seq 7

Request timeout for icmp_seq 8

Request timeout for icmp_seq 9

Request timeout for icmp_seq 10

Request timeout for icmp_seq 11

Request timeout for icmp_seq 12

Request timeout for icmp_seq 13

Request timeout for icmp_seq 14

Request timeout for icmp_seq 15

Request timeout for icmp_seq 16

Request timeout for icmp_seq 17

Request timeout for icmp_seq 18

Request timeout for icmp_seq 19

64 bytes from 172.16.0.4: icmp_seq=0 ttl=64 time=20877.422 ms

64 bytes from 172.16.0.4: icmp_seq=1 ttl=64 time=19874.612 ms

64 bytes from 172.16.0.4: icmp_seq=2 ttl=64 time=18869.398 ms

64 bytes from 172.16.0.4: icmp_seq=3 ttl=64 time=17864.163 ms

64 bytes from 172.16.0.4: icmp_seq=4 ttl=64 time=16860.696 ms

64 bytes from 172.16.0.4: icmp_seq=5 ttl=64 time=15855.486 ms

64 bytes from 172.16.0.4: icmp_seq=6 ttl=64 time=14852.136 ms

64 bytes from 172.16.0.4: icmp_seq=7 ttl=64 time=13846.905 ms

64 bytes from 172.16.0.4: icmp_seq=8 ttl=64 time=12841.727 ms

64 bytes from 172.16.0.4: icmp_seq=9 ttl=64 time=11836.498 ms

64 bytes from 172.16.0.4: icmp_seq=10 ttl=64 time=10831.318 ms

64 bytes from 172.16.0.4: icmp_seq=11 ttl=64 time=9826.079 ms

64 bytes from 172.16.0.4: icmp_seq=12 ttl=64 time=8820.894 ms

64 bytes from 172.16.0.4: icmp_seq=13 ttl=64 time=7815.655 ms

64 bytes from 172.16.0.4: icmp_seq=14 ttl=64 time=6810.474 ms

64 bytes from 172.16.0.4: icmp_seq=15 ttl=64 time=5805.234 ms

64 bytes from 172.16.0.4: icmp_seq=16 ttl=64 time=4800.055 ms

64 bytes from 172.16.0.4: icmp_seq=17 ttl=64 time=3794.813 ms

64 bytes from 172.16.0.4: icmp_seq=18 ttl=64 time=2789.628 ms

64 bytes from 172.16.0.4: icmp_seq=19 ttl=64 time=1788.928 ms

64 bytes from 172.16.0.4: icmp_seq=20 ttl=64 time=783.718 ms

64 bytes from 172.16.0.4: icmp_seq=21 ttl=64 time=12.067 ms

^C

--- 172.16.0.4 ping statistics ---

43 packets transmitted, 22 packets received, 48.8% packet loss

round-trip min/avg/max/stddev = 12.067/10338.996/20877.422/6357.748 ms

MacBook-Pro:~ User$ ping 172.16.0.4

PING 172.16.0.4 (172.16.0.4): 56 data bytes

Request timeout for icmp_seq 0

Request timeout for icmp_seq 1

Request timeout for icmp_seq 2

Request timeout for icmp_seq 3

Request timeout for icmp_seq 4

Request timeout for icmp_seq 5

Request timeout for icmp_seq 6

Request timeout for icmp_seq 7

Request timeout for icmp_seq 8

Request timeout for icmp_seq 9

Request timeout for icmp_seq 10

Request timeout for icmp_seq 11

Request timeout for icmp_seq 12

64 bytes from 172.16.0.4: icmp_seq=0 ttl=64 time=13027.631 ms

64 bytes from 172.16.0.4: icmp_seq=1 ttl=64 time=12027.529 ms

64 bytes from 172.16.0.4: icmp_seq=2 ttl=64 time=11027.442 ms

64 bytes from 172.16.0.4: icmp_seq=3 ttl=64 time=10029.982 ms

64 bytes from 172.16.0.4: icmp_seq=4 ttl=64 time=9025.650 ms

64 bytes from 172.16.0.4: icmp_seq=5 ttl=64 time=8023.457 ms

64 bytes from 172.16.0.4: icmp_seq=6 ttl=64 time=7022.405 ms

64 bytes from 172.16.0.4: icmp_seq=7 ttl=64 time=6021.737 ms

64 bytes from 172.16.0.4: icmp_seq=8 ttl=64 time=5021.456 ms

64 bytes from 172.16.0.4: icmp_seq=9 ttl=64 time=4020.193 ms

64 bytes from 172.16.0.4: icmp_seq=10 ttl=64 time=3014.948 ms

64 bytes from 172.16.0.4: icmp_seq=11 ttl=64 time=2014.588 ms

64 bytes from 172.16.0.4: icmp_seq=12 ttl=64 time=1009.312 ms

64 bytes from 172.16.0.4: icmp_seq=13 ttl=64 time=1006.971 ms

64 bytes from 172.16.0.4: icmp_seq=14 ttl=64 time=1003.922 ms

64 bytes from 172.16.0.4: icmp_seq=15 ttl=64 time=1006.938 ms

64 bytes from 172.16.0.4: icmp_seq=16 ttl=64 time=1004.760 ms

64 bytes from 172.16.0.4: icmp_seq=17 ttl=64 time=1005.372 ms

64 bytes from 172.16.0.4: icmp_seq=18 ttl=64 time=1006.903 ms

64 bytes from 172.16.0.4: icmp_seq=19 ttl=64 time=1007.058 ms

64 bytes from 172.16.0.4: icmp_seq=20 ttl=64 time=1005.243 ms

64 bytes from 172.16.0.4: icmp_seq=21 ttl=64 time=1006.627 ms

64 bytes from 172.16.0.4: icmp_seq=22 ttl=64 time=1004.922 ms

64 bytes from 172.16.0.4: icmp_seq=23 ttl=64 time=1007.020 ms

64 bytes from 172.16.0.4: icmp_seq=24 ttl=64 time=1006.933 ms

64 bytes from 172.16.0.4: icmp_seq=25 ttl=64 time=1007.128 ms

64 bytes from 172.16.0.4: icmp_seq=26 ttl=64 time=1006.607 ms

64 bytes from 172.16.0.4: icmp_seq=27 ttl=64 time=1006.961 ms

64 bytes from 172.16.0.4: icmp_seq=28 ttl=64 time=787.090 ms

64 bytes from 172.16.0.4: icmp_seq=29 ttl=64 time=1003.933 ms

64 bytes from 172.16.0.4: icmp_seq=30 ttl=64 time=1006.970 ms

64 bytes from 172.16.0.4: icmp_seq=31 ttl=64 time=1006.496 ms

64 bytes from 172.16.0.4: icmp_seq=32 ttl=64 time=545.807 ms

64 bytes from 172.16.0.4: icmp_seq=33 ttl=64 time=1002.544 ms

64 bytes from 172.16.0.4: icmp_seq=34 ttl=64 time=1007.150 ms

64 bytes from 172.16.0.4: icmp_seq=35 ttl=64 time=1002.118 ms

64 bytes from 172.16.0.4: icmp_seq=36 ttl=64 time=1007.046 ms

64 bytes from 172.16.0.4: icmp_seq=37 ttl=64 time=1002.201 ms

64 bytes from 172.16.0.4: icmp_seq=38 ttl=64 time=1007.067 ms

64 bytes from 172.16.0.4: icmp_seq=39 ttl=64 time=1006.290 ms

64 bytes from 172.16.0.4: icmp_seq=40 ttl=64 time=1006.980 ms

64 bytes from 172.16.0.4: icmp_seq=41 ttl=64 time=1002.614 ms

64 bytes from 172.16.0.4: icmp_seq=42 ttl=64 time=1006.847 ms

64 bytes from 172.16.0.4: icmp_seq=43 ttl=64 time=219.053 ms

64 bytes from 172.16.0.4: icmp_seq=44 ttl=64 time=1006.971 ms

64 bytes from 172.16.0.4: icmp_seq=45 ttl=64 time=1007.018 ms

64 bytes from 172.16.0.4: icmp_seq=46 ttl=64 time=1006.963 ms

64 bytes from 172.16.0.4: icmp_seq=47 ttl=64 time=1006.707 ms

64 bytes from 172.16.0.4: icmp_seq=48 ttl=64 time=1004.571 ms

64 bytes from 172.16.0.4: icmp_seq=49 ttl=64 time=1006.128 ms

64 bytes from 172.16.0.4: icmp_seq=50 ttl=64 time=1005.779 ms

64 bytes from 172.16.0.4: icmp_seq=51 ttl=64 time=1004.791 ms

^C

--- 172.16.0.4 ping statistics ---

53 packets transmitted, 52 packets received, 1.9% packet loss

round-trip min/avg/max/stddev = 219.053/2481.708/13027.631/3224.515 ms

MacBook-Pro:~ User$ ping 172.16.0.4

PING 172.16.0.4 (172.16.0.4): 56 data bytes

64 bytes from 172.16.0.4: icmp_seq=0 ttl=64 time=66.164 ms

64 bytes from 172.16.0.4: icmp_seq=1 ttl=64 time=143.980 ms

64 bytes from 172.16.0.4: icmp_seq=2 ttl=64 time=144.872 ms

64 bytes from 172.16.0.4: icmp_seq=3 ttl=64 time=141.234 ms

64 bytes from 172.16.0.4: icmp_seq=4 ttl=64 time=141.291 ms

64 bytes from 172.16.0.4: icmp_seq=5 ttl=64 time=142.138 ms

64 bytes from 172.16.0.4: icmp_seq=6 ttl=64 time=138.506 ms

64 bytes from 172.16.0.4: icmp_seq=7 ttl=64 time=133.520 ms

64 bytes from 172.16.0.4: icmp_seq=8 ttl=64 time=129.374 ms

64 bytes from 172.16.0.4: icmp_seq=9 ttl=64 time=125.082 ms

^C

--- 172.16.0.4 ping statistics ---

10 packets transmitted, 10 packets received, 0.0% packet loss

round-trip min/avg/max/stddev = 66.164/130.616/144.872/22.357 ms

MacBook-Pro:~ User$ ping 172.16.0.3

PING 172.16.0.3 (172.16.0.3): 56 data bytes

64 bytes from 172.16.0.3: icmp_seq=0 ttl=128 time=8.753 ms

64 bytes from 172.16.0.3: icmp_seq=1 ttl=128 time=3.596 ms

64 bytes from 172.16.0.3: icmp_seq=2 ttl=128 time=8.470 ms

64 bytes from 172.16.0.3: icmp_seq=3 ttl=128 time=2.675 ms

^C

--- 172.16.0.3 ping statistics ---

4 packets transmitted, 4 packets received, 0.0% packet loss

round-trip min/avg/max/stddev = 2.675/5.874/8.753/2.759 ms

MacBook-Pro:~ User$ ping 172.16.0.4

PING 172.16.0.4 (172.16.0.4): 56 data bytes

64 bytes from 172.16.0.4: icmp_seq=0 ttl=64 time=657.174 ms

64 bytes from 172.16.0.4: icmp_seq=1 ttl=64 time=648.823 ms

64 bytes from 172.16.0.4: icmp_seq=2 ttl=64 time=644.471 ms

64 bytes from 172.16.0.4: icmp_seq=3 ttl=64 time=639.030 ms

Request timeout for icmp_seq 4

Request timeout for icmp_seq 5

Request timeout for icmp_seq 6

Request timeout for icmp_seq 7

Request timeout for icmp_seq 8

Request timeout for icmp_seq 9

64 bytes from 172.16.0.4: icmp_seq=4 ttl=64 time=6029.385 ms

64 bytes from 172.16.0.4: icmp_seq=5 ttl=64 time=5024.202 ms

64 bytes from 172.16.0.4: icmp_seq=6 ttl=64 time=4019.025 ms

64 bytes from 172.16.0.4: icmp_seq=7 ttl=64 time=3017.793 ms

64 bytes from 172.16.0.4: icmp_seq=8 ttl=64 time=2012.558 ms

64 bytes from 172.16.0.4: icmp_seq=9 ttl=64 time=1008.445 ms

64 bytes from 172.16.0.4: icmp_seq=10 ttl=64 time=5.456 ms

64 bytes from 172.16.0.4: icmp_seq=11 ttl=64 time=4021.800 ms

64 bytes from 172.16.0.4: icmp_seq=12 ttl=64 time=3016.668 ms

64 bytes from 172.16.0.4: icmp_seq=13 ttl=64 time=2012.379 ms

64 bytes from 172.16.0.4: icmp_seq=14 ttl=64 time=1008.238 ms

64 bytes from 172.16.0.4: icmp_seq=15 ttl=64 time=5.171 ms

64 bytes from 172.16.0.4: icmp_seq=16 ttl=64 time=4016.184 ms

64 bytes from 172.16.0.4: icmp_seq=17 ttl=64 time=3010.968 ms

64 bytes from 172.16.0.4: icmp_seq=18 ttl=64 time=2009.052 ms

64 bytes from 172.16.0.4: icmp_seq=19 ttl=64 time=1004.764 ms

64 bytes from 172.16.0.4: icmp_seq=20 ttl=64 time=5.594 ms

64 bytes from 172.16.0.4: icmp_seq=21 ttl=64 time=4018.787 ms

64 bytes from 172.16.0.4: icmp_seq=22 ttl=64 time=3018.671 ms

64 bytes from 172.16.0.4: icmp_seq=23 ttl=64 time=2013.474 ms

64 bytes from 172.16.0.4: icmp_seq=24 ttl=64 time=1008.294 ms

64 bytes from 172.16.0.4: icmp_seq=25 ttl=64 time=12.125 ms
[doublepost=1469310328][/doublepost]The ping fro the iMac to the base station is normal, as is the ping from the MBP to a Windows desktop (.3 address above).
 
I put both systems onto 2.4 GHz wireless, and the problem has "gone away".

It would seem something related to AirDrop runs over/using 5 GHz WiFi as part of discovery, but that is not in use/active, and BT is disabled on the MBP. Strangely, the iMac when on 5 GHz doesn't exhibit the same problem (at the moment).
 
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