2 or more domains point to same ip is ok, but no-ip might control and let you only connect to 1 domain unless you pay for extra services; however, I'm not quite sure about this so you might want to check w/ them to verify
if your isp don't block port 80, then you don't need to use no-ip, just sign up for free account at zoneedit and follow my guide here, just replace the name of domain, sub1, sub2 to your real domain names
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