RE: Bug in IP Parsing

["Brandon Enright" <bmenrigh () ucsd edu>]

  Juan Perez wrote:
> There seems to be a bug in the IP parsing mechanism.
>
> Example:
>
> input file: test
>
> test is only two lines:
>
> 10.10.0.0/24
> 10.10.0.80/24
>
> The bug is that the second line is an invalid combination and
> therefore should be rejected.Instead, nmap ignores the last
> octet(80) and proceeds to parse it as 10.10.0.0/24 .

This is not a bug.  The /24 specifies that only the first 24 bits of
10.10.0.80 are significant.  A simple AND with the bitmask results in
10.10.0.0.

See RFCs 1517, 1518, 1519, and 1520 for more information.


Regards,

Brandon


--
Brandon Enright
UCSD ACS/Network Operations
bmenrigh () ucsd edu



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