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