webmaster wrote:
> Let me make sure I understand....
>
> The following data entered into the Imail Adminstrator's "Deny Access
> On" window for the following fields would be...
>
> IP address: 211.65.0.0
> Subnet mask: 255.255.0.0
>
> ...and would totally block all mail from IPs 211.65.0.0 through
> 211.65.255.255 ? Is this correct?
Yes.
Think of the submask as a bit mask, take an IP address and 'and' it
with the mask. If the result matches the network address (211.65.0.0)
then its in that subnet.
Note that the rightmost nonzero octet can be 255, 254, 252, 248, 240,
224, 192, or 128. The submask should be a string of 1's followed by a
string of 0's.
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