Architecting Citywide Ubiquitous Wi-Fi Access
Nishanth Sastry (University of Cambridge, MIT), Jon Crowcroft (University of
Cambridge), and Karen Sollins (MIT)

• Q: Does your approach envisions that each access point can limit how much bandwidth guest can eat up?
• A: Sure!

• Q: In this solution we push legitimacy issues to the home agent. If we can identify the host then we can get rid of this architecture, right?
• A: Right but host identity is not here yet!

• Q: Why don’t we just put the users in the separate VLANs?
• A: The guest is untrusted, we must tunnel it.

• Q: VV: How is it different from FON?
• Ans: it is not secure and a lot of trust issues arise.

• Q: JW: You have eliminated some trust dependencies, but also created a centralized authority, right? One should think how to remove this dependency as well.
• A: True.

• Q: HB: A system called wibiki, apparently used MAC address based authentication. Is your approach comparable to it?
• A: Wibiki seems to be gone... What happened to Wibiki required reflashing the APs, which voided the warranty.