yea, there is many ways to secure the pipe. But at the same time you have to do it in such a mannor that is "time period compatible" to the machine your accessing from. Such as VPN software for example. if it cant run on OS7 or etc, then it wont work.
Same for the scripting on the login, if the browser cant render the scripts, then that wont work either. Nice thing about the VPN though is it brings all your network resources behind the router to the connected network your on now. I do it at work, its nice.
Anyway, i know the westell routers for DSL support guest mode, as ive seen open WiFi connections but when you hop on it wont work until you provide a login for the westell.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, Lombard, 160, 165, 180, Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, 5260/100 x2, SE, SE/30, 512k, plus, LCIII, 7100, iMac G5 iSight, 6400/225