Up until today all has been going fairly well. I am running Debian Squeeze on my Pi, recompiled the Kernel to add UVC support for my Logitech C910, got motion working and FTPing videos to my web server, all good....
Today I took delivery of a ZyXEL NWD2105 wifi dongle and installed the driver as per another forum post:
aptitude -t squeeze-backports install firmware-realtek
apt-get install firmware-ralink
Configured /etc/network/interfaces to connect wlan0 to my wifi network and ran ifup wlan0. This all seems to work ok but on both my networks (one WEP and one WPA) pings to the Pi and SSH to the Pi are spotty at best, pings either time out or get a reply seemingly random. SSH commands take ages to get through if they do at all, sometimes putty disconnects. From the Pi though I can ping http://www.google.com
and everything is fine, no timeouts.
I'm running the ZyXEL direct from the Pi at the moment but have had the same result with it running on a powered Belkin hub (F4U018-BLK) with the exact same results so I don't *think* it's power related. I'm running the Pi from my kindle charger which is rated 5V at 0.85A.
Has anyone heard of anything like this before?