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I have a business with an open Wifi router for my customers, I was wondering if I put the wifi router on a different subnet would help protect my wired network?

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If the subnet is logically separated from your business network using a firewall, then it will make your network more secure.

If it's just a separate IP subnet with full access into your business network, then it will no really make things any more secure.

This question has more details: Sharing wifi at a business - Bad Policy?

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Some Wifi nodes may provide an "isolated" Guest network, but I probably wouldn't trust one of those to keep my network secure, I'd use a separate node in a separate firewalled network (or even outside of my network entirely, on the "WAN" side of my firewall) to provide an open guest network. This is just a personal opinion so I've left it as a comment rather than part of my answer. –  Johnny Jun 20 '13 at 13:57
    
These are very good suggestions, but what if it's just a cable modem hooked up with a wifi router? It seems like just the Guest network maybe the only solution for that setup. My business has 10 employees and only the 3 people use computers. –  user27455 Jun 20 '13 at 14:17
    
It depends on your tolerance for risk -- using your Wifi node's built-in Guest network is likely better than doing nothing at all, but if it were me, I'd want a separate Wifi node for the guest users that's isolated from my business network with a separate firewall. Of course, that's easy for me to say since I wouldn't have to hire anyone to configure it, so you may value the simplicity of not having additional hardware to purchase and configure. –  Johnny Jun 20 '13 at 16:01
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