Happens sporadically, in 5-20 minute intervals; as soon as I reconnect to my school's network (sometimes requires re-authentication), it works fine until the next failure.
When plugged into ethernet, there are no connection problems.
We use Cisco Clean Access servers. The authentication takes place in the web browser and requires username and password. I don't believe there is any authentication (WPA, etc.) on the connection itself.
I have run updates, and have not experienced any problems like this on other wireless networks. I run Ubuntu 11.04.
sudo lshw -class network:
*-network description: Ethernet interface product: 82566MM Gigabit Network Connection vendor: Intel Corporation physical id: 19 bus info: pci@0000:00:19.0 logical name: eth0 version: 03 serial: 00:1f:e2:12:3c:8b capacity: 1Gbit/s width: 32 bits clock: 33MHz capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.2.20-k2 firmware=0.3-0 latency=0 link=no multicast=yes port=twisted pair resources: irq:46 memory:fe200000-fe21ffff memory:fe225000-fe225fff ioport:1840(size=32) *-network description: Wireless interface product: AR5001 Wireless Network Adapter vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:03:00.0 logical name: wlan0 version: 01 serial: 00:23:4d:dc:69:3e width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=ath5k driverversion=2.6.38-11-generic firmware=N/A ip=220.127.116.11 latency=0 link=yes multicast=yes wireless=IEEE 802.11bg resources: irq:17 memory:df2f0000-df2fffff