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Shortly after upgrading to the recent kernel 3.2.0-36-generic I started to notice that my wireless connection got seriously jammed:

  • Anything over the web (SSH, HTTP(S)) appears to be a bit slow.
  • Pinging my access point produces a rather high packet loss rate and even if there is no traffic from other machines in the network the response time ranges from 0.5ms to 300ms.
  • Quite commonly the ping says "destination host unreachable".
  • Dis- and reconnecting to the AP (WPA2-PSK) is working well, but ping is still complaining about "destination host unreachable".
  • Other machines (laptops and smartphones) show no such behavior.
  • syslog, dmesg and iw show no suspicious messages.
  • Wireshark tells me that -- among some erroneous or lost packets -- my machine is constantly sending LLC, BACnet-APDU and X.25 protocol packets to the MAC address belonging to the laptop of my wife.

You can find output of "wireshark" (48 LLC packets) here.

I have tried netstat and ntop in order to find the process responsible for sending those packets, but I was not able to do so.

Could this be my wireless driver (ath5k for Atheros Communications Inc. AR5212/AR5213 Wireless Network Adapter) or kernel running wild? Or is this simply my wireless card telling me that it is gone???

Some other details on my machine:

  • AMD Phenom 9500
  • 4GB RAM
  • NVIDIA GeForce 8600GT
  • Xubuntu 12.04 (64bit)
  • Atheros Communications Inc. AR5212/AR5213 Wireless Network Adapter
  • Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller
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closed as off topic by Eliah Kagan, Eric Carvalho, hhlp, Mik, gertvdijk Feb 9 '13 at 23:39

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

Just booted an older kernel (3.2.0-35). - LLC flood still present. - but "ping" shows acceptable statistics: 200 packets transmitted, 188 received, 6% packet loss, time 199036ms rtt min/avg/max/mdev = 0.468/2.747/145.535/14.417 ms – Crazy PhD Jan 30 '13 at 21:52
Filed bug at – Crazy PhD Jan 31 '13 at 16:45
Disruptions in data connection seems to be an issue specific to kernel 3.2.0-36. – Crazy PhD Jan 31 '13 at 18:32
Doing some extended testing it appears the other device broadcasts one LLC packet, which causes my machine to constantly send replies in the same protocol. – Crazy PhD Jan 31 '13 at 18:33
As this appears to be a bug, this will probably be closed as off-topic, in accordance with the FAQ and this policy. – Eliah Kagan Feb 8 '13 at 22:49