stephanie wrote on Jan 31st, 2010 at 7:19am:Is mesh access point stronger than the normal one ?
It seems to me that you are not qualified to deploy WiFi for a city. If you really are doing this project, I highly suggest you save your city a bunch of money and start by hiring a contractor who is qualified to consider these issues.
If you aren't really doing this project, and it is something hypothetical, then it would be best if you start doing some basic research and come back to us with any specific questions you have.
stephanie wrote on Jan 31st, 2010 at 7:19am:i don't know what software is need
-network OS ,firewall and ??
There is no software suitable for 60K users that can do this. You need dedicated hardware. There are a few open source options, but they are difficult to maintain on such a large scale.
stephanie wrote on Jan 31st, 2010 at 7:19am:Is mesh access point stronger than the normal one ?
The difference is not in strength. The difference is in how users communicate between each other. Infrastructure mode ("normal mode" as you call it) uses a central control point for network communication. Mesh networks allow hosts to get information from the network by talking directly to each other and even passing information on to hosts that are further from the source.
stephanie wrote on Jan 31st, 2010 at 7:19am:for security i think it does not need to be highly security but it cannot being attacked easily
There are many factors here and you'll have to have a few layers of security. Again, if this is a real project, I hope you will take my advice and hire a contractor to make decisions like this. If you don't, you will waste a ton of your city's money and expose all your users to significant risk. You can contact me directly if you'd like some references.
If this is not a real project, you are going to want to do more reading. We can't possibly cover all the things you need to think about in a simple forum thread like this.