I have DSL with dynamic IP address.
Someone behind *IP address removed* flooded my client with more than 50 starting downloads. When I recognized this, I filtered that IP.

Some days later, the same IP again started to download one file after the other from my gnutella client. Again, I filtered this IP.

But then, minutes later, someone using the "neighbour" IP *IP address removed* continued to start many downloads from my client!

Can you explain this? Could this be a danger to me?
(Usually I'm sharing ca 900 files)