Airport allows access to only one computer at a time

Is there a setting which prevents internet access by more than 1 computer at a time via airport? I cannot get laptops to connect simultaneously (via airport) to the internet

If both NAT & DHCP are both enabled (the default) on the AirPort, and each of the computers are configured as DHCP clients, then they should all be able to access the Internet through the AirPort simultaneously.
To verify that both NAT & DHCP are enabled, check that Connection Sharing = Share a public IP address. (ref: AirPort Utility > Manual Setup > Internet > Internet Connection > Connection Sharing)

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