Validating user IP and form IP: Should I use ip2long?
<p>Actually this is a two parts question:</p>

<p>First, is ip2long a good IP validator? Suppose someone inserts an IP in a form, and I want to validate that it is correct. Is it OK to just check that ip2long doesn't return FALSE ?</p>

<p>Second: What do you think about checking the IP of the visitors, and denying access if it's not a valid IP? Looking at my visitor's ips, sometimes I find things like "1.1 TIBURON".. Wtf is that? I heard the expression 'spoofed ip', is that what it is? Is it related to spam bots?</p>
