detecting multihomed host

[alexander lind <malte () webstay org>]

Hi List

Assume I have a network, connected to the internet but shielded with  
an OpenBSD PF firewall with default settings (scrub all packets), that  
is a bridge so all machines can bind outside IP addresses directly.

Inside this network I have a multihomed machine with 20 different IP  
addresses bound to its one NIC.
All IP addresses are ping:able from the outside.

Now for the question:
Say that someone on the outside knows all of my 20 IP addresses. Is  
there any way that this person could detect that all 20 of these IP  
addresses are bound to my one machine inside my network?

Thanks
Alec
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