If Mahathma's problem is try to conserve the IP space and/or the air time for legitimate Corporate Guest users, then I totlly agree with Tim and Colin.
On the other hand, I have come across a situation whereby the Guest Wi-Fi provider denies any more clients to associate to it. I guess there can be many reasons - e.g. run out of DHCP addresses, the internet pipe is getting congested, etc.
"We are currently experiencing a high level of activity on our network and are unable to connect you to the free public Wi-Fi at this time. We apologise for any inconvenience and ask you to try and connect again shortly."
I'm just wondering how we can achieve this design approach?
Sometimes I *think* that this is better than having a huge IP space and just try to faciliate as many people as possible.
Thanks in advance.