How to identify unrefered IP address

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Hi guys,

We have set up a Firewall based on Linux. Since several days there are 
some IP address trying to enter
using telnet.

One of them was found using nslookup. We sent a warning message to the 
ISP manager and they stopped.

But the other is trying like crazy requesting telnet who are rejected by 
the security rules.

This address in unknowed by nslookup.

Any idea about how to catch this #@]|]]!! unfair person ?

Thanks

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