Associate
Netgear DG834N.
The thing is, airport will say I've got full connection and then a page will tell me I'm not connected to a network. If I refresh the page, or go to another page, it works again. Maybe it's a safari issue.
Panzer
Try this
Open terminal and type:
(for leopard): dscacheutil -flushcache
(for tiger): lookupd -flushcache
The dns cache is getting corrupted (allegedly) and this will clear it out.
I personally use open DNS for my DNS needs and have not seent his issue.