which is the best routing os for wifi hotspot [closed]

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http://serverfault.com – hello i am looking for a solution which can give me these features captive portal static and dynamic contents caching load balancing and failover high speed routing i have found there and its difficult to decide which one is a good choice help required vyatta (need to now how can it support captive portal) pf-sense mikrotik zeroshell please guide with your suggestions regards (HowTos)