Re: [gentoo-user] iptables: block full ip-range

[Ralph Slooten]

Thanks Chris ... it's not all 100% clear now, but slowly understanding 
more. When I eventually "get it" I'll create a php script to do it for 
me *g*.

Thanks again for your time.
I did find this though: http://logi.cc/nw/NetBitCalc.html (using the 
netaddr option).

Maybe it'll interest others too.
Ralph
Chris Boot wrote:
Hi,
I used the "IP Address Converter" section.
I got the binary for the first IP (218.144.0.0), which is:
11011010 10010000 00000000 00000000
Then for the second (218.159.255.255), which is
11011010 10011111 11111111 11111111
Notice how the first 12 bits stay the same, and the last 12 change? 12 
is the magic number in this case. :-)

There should be an easier tool for this, but it does the trick.
Chris
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