On Fri, 31 Jul 1998, Steve Lamb wrote:
> >sender_net_accept_relay = 192.168.0.0/16
Instead of 192.168.0.0/0
>
> <DUNCE>
> OK, what is the difference?
> </DUNCE>
The number after the slash tells you the number of significant bits of the
ip address. The parts between dots correspond to 8 bits each (numbers
between 0-255).
So 192.168.0.0/16
is sort of like
192.168.*.*
while
192.168.0.0/0
is like
*.*.*.*
since 0 bits are significant.
A reason for the / notation is that it allows easier masking of groups of
addresses that don't always fall into blocks of 8 bits. So one could have
192.168.1.128/25
(I think I've got that right).
-j
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