I just checked my Netgear WGR614 control panel and discovered that for some reason I had left NAT in "open" mode rather than "secure." The description the control panel gives is vague, I'm worried ...

I scanned my router and didn’t like what I saw.

I know very little about networking so was hoping that some here who do can help me out a bit... So I am in the unfortunate situation of living in a nice, older part of a (now) large suburban area ...