It represents the netmask (255.248.0.0) for the network. The easiest way
to get from an inverse mask to a regular netmask is like this:
255.255.255.255 fill 'er up
- 000.007.255.255 subtract the inverse mask
---------------
255.248.000.000 real netmask
So, if you have a 0.7.255.255 inverse mask, it equates to 255.248.0.0.
Likewise, if you had 0.0.15.255, the mask would be 255.255.240.0.
You can also take the normal mask and get the inverse mask by doing the
opposite.
255.255.255.255
- 255.248.000.000
---------------
000.007.255.255
-j
On Tue, 24 Oct 2000, Keith Townsend wrote:
> I need help in understanding inverse masks that are used in network & access
> list commands. I understabd what 0 and 255 do but I get confused when there
> is any number other than these two. For example...
>
> network 10.0.0.0 0.7.255.255 area 0
>
> what does the 7 represent or specifiy for the mask.
>
> Thanks
>
> Keith
>
>
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