Security Incidents mailing list archives

Re: Spider with improbable IP address


From: Ric Messier <kilroy () WasHere COM>
Date: Fri, 15 Oct 2004 16:19:46 -0600 (MDT)


On Fri, 15 Oct 2004, Bennett Todd wrote:


The .0 address is routinely the network number, not a usable IP
address --- but this is only because CIDR blocks used as IP nets are
routinely /24 and smaller. Consider the perfectly legitimate IP
network (in RFC 1918 space, for illustration purposes)

        10.0.0.0/23

Here are the relevent details:

        255.255.255.128 netmask

I suspect you really are going for 255.255.254.0 as the netmask here. :-)

Ric


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