There are several techniques for using TCP to determine the status of a host.

Advanced methods (see nmap and hping) require inspection of TCP headers and handshaking. Net::Ping relies on connect() only. I believe a revamp (maybe with Net::RawIP) would definitely be a good thing.

In reply to Re: Re: Re: A proposal for improvements to Net::Ping by rpc
in thread A proposal for improvements to Net::Ping by Falkkin

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