Quote:
Originally Posted by catback
You'd think but some isp's have multiple classes that they allot in and a certain block may end up too narrow. It also doesn't address the wide availability of access to the net unless he's living in historical times where he can ONLY access the net at work or home. Personally I can access the net at home, work, any mcdonalds, any coffee shop, at the book store, at other peoples unsecured wi-fi, and other places without even resorting to friends and the IP will be different at all of them, on different blocks as well. IF and this is a BIG IF I was blocked by IP I can always proxy my way through.
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Actually, nobody has any classes for anything. That's the whole point of CIDR.
Regarding the rest, any security measure can be circumvented by someone who has the necessary knowledge and determination. Doesn't make such measures useless. Security could more properly be deemed to be the practice of making access too difficult to be worth the reward.
Barring a creepy stalker scenario, I can't imagine his wife's ex is so determined to see a bunch of wedding photos that he'd go through the effort of accessing the site via a random wireless AP. Aside from that, there's no practical way to prevent that while keeping the site easy for the intended userbase to access.
Ultimately, the only foolproof security measure on the internet is to not put anything you don't want anyone to have access to online. However, that doesn't negate the usefulness of simple tricks like this one.