nobodynowhere.com
Date: Sun Aug 21 2005 - 17:43:28 CDT

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Nope. According to your example, you have defined two networks:

10.0.0.0/23
10.0.1.0/23

10.0.{0,1}.255 would be the broadcast address for each one
10.0.{0,1}.0 would <still> be the network address itself - not a host address

There's only one valid application/use of .0 as a host address - check http://www.ietf.org/rfc/rfc3021.txt?number=3021 - which also includes a lot if interesting pointers to other RFCs and addressing rules for IPv4.

Considering the answers Hannibal got, I tend to think the packet to .0 got translated by a route connected to that network to an L2 broadcast - and more than one host received it and replied to it. So actually those open ports could come from one, two, or three different hosts.

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