Oh...yeah...adding a free software firewall is going to help ?? The issue is now not with voucher system or not already....nobody really plugs in the public access WiFi to their LAN and give out same IP address range as their LAN also...
OP is not even inclined on getting AP for his requirement which is very cheap which tells us that management will not be spending a single dime on what they want to achieve. They want to get as much income as possible by having hospital guest pay for internet access.
If OPcan learn through setting up and configuring pfsense then he would be able to put some level of protection compared to the current setup that he has.
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