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Date Posted: 20:27:59 05/28/00 Sun
Author: N. Lyne
Subject: Re: Ban Lists - how to stop banning others accidentally
In reply to: Just Me 's message, "Ban Lists - how to stop banning others accidentally" on 05:30:34 05/25/00 Thu

Well the main problem is that most major or large ISPs (and even now smaller ones as well) are using what are called caching proxy servers, they are invisible to the people using the ISP, but not to places running servers. AOL is a great example of this, they have 14 million+ users but all of them will show up from a few dozen servers, probably with webcache in the name somewhere. So if one user from this ISP is giving you problems you are not really blocking that user, but EVERYONE using that ISP because they all share maybe 1, 2 or dozens of servers. I have a 1mbps bi-directional connection with US West with static IP addresses. Incoming traffic TO my IP addresses works just like it should, and I run web, dns, email and ftp servers on these addresses, BUT when I visit web pages you will see me coming from only a few server IP addresses with webcache also in the name. ISPs do this of course to speed up your time on the net by caching unchanging web pages that a lot of people maybe visiting.

but the short of it is, if you have a person you are trying to ban from these servers, you will end up banning everyone that uses that ISP, there really is no way around that, because it does not matter if the ISP has 10 or 10 million users they will all be coming here looking like the same few IP addresses as the caching proxy servers.

Best of luck on this one.


> Hi,
>
> I have problems regards my ban lists which works but
> it also stops others who aren't causing a problem from
> posting. For example if the IP's (?) look like this:
>
> webcacheh05a.cache.pol.co.uk 195.92.67.38
> webcacheh07a.cache.pol.co.uk 195.92.67.40
> 195.92.67.36
> 195.92.67.37
>
> Do I ban the whole thing ie:
> webcacheh05a.cache.pol.co.uk 195.92.67.38
>
> or just the last bit:
> 195.92.67.38
>
> It then seems that that same person's IP keeps
> changing each time they log on.
>
> The above is one person's ID. However someone else
> who is okay, has an IP of
> webcache06a.cache.po1.co.uk 195.92.67.39
>
> and she has been having problems accessing to post at
> my site. I've temporarily taken away the first bit of
> ban ie webcache etc and she's been able to post;
> though she says she still occasionally has problems.
> I assume that each time she logs on her IP is
> different??

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