Re: Determining what should be blocked in and out?

From: Lance Delacroix (lance_delacroix@fastmail.fm)
Date: 12/19/01 

From: Lance Delacroix <lance_delacroix@fastmail.fm>
Date: Wed, 19 Dec 2001 16:57:34 +0200

On 19 Dec 2001 10:23:01 GMT, eirik@peter.mi.uib.no (Eirik Seim) wrote:

>On Wed, 19 Dec 2001 09:46:51 +0200, Lance Delacroix
> <lance_delacroix@fastmail.fm> wrote:
>>Great post -- thanks! I need some clarification, though, on a couple
>>of points.
>>
>>
>>On Wed, 19 Dec 2001 04:29:22 GMT, mtubi@python.net (sponge) wrote:
>>
>>>208.184.172.0 (the /24 means the first three dotted numbers must be
>>>entered as shown; you add a dot and a zero. If it says /16, only the
>>>first two dotted numbers should be added (you add a .0 and again a .0)
>>
>>I'm confused by this /24 and /16. You simply mean that you
>>substitute .0 for /24 and you substitute .0.0 for /16?
>
>Sort of, yes. But I think it is somewhat important to know _why_, making
>it easier to block certain IP ranges yourself. Read on.
>
>>>Note: Alexa may use all of 209.247/16. Play it safe and block the
>>>whole thing (209.247.0.0-209.247.255.255)
>>
>>Here you have a range shown. Do you enter the range exactly as
>>shown, or does each individual IP address need its own rule?
>
>I don't know about the product you're using, but it should be able to
>understand simply 209.247/16.

Tiny Personal Firewall, and it doesn't like that format at all.

>Check out http://public.pacbell.net/dedicated/cidr.html if I don't make any
>sense. I've not even finished my first coffe yet :)

You do make sense, and you also show me my own ignorance. One more
question: Does using an address that ends in 0. or 0.0. automatically
specify a range?

Thanks!

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