Re^4: Proving a UDP port is closed


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Re^4: Proving a UDP port is closed

by davis (Vicar)

on Feb 01, 2011 at 15:11 UTC ( [id://885512]=note: print w/replies, xml )

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in reply to Re^3: Proving a UDP port is closed
in thread Proving a UDP port is closed

Sorry, I realised the stupidity of what I'd said (the implied magic) fairly quickly! Yeah, grokking the "netstat -af inet" output would almost certainly work for me for both TCP and UDP listeners, but there's still something somehow... cleaner about the attempted connection method, at least in my head.

davis

Comment on Re^4: Proving a UDP port is closed

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Re^5: Proving a UDP port is closed by Anonymous Monk on Feb 01, 2011 at 15:29 UTC
Is it possible for a listener to black-hole the port, and soak up messages (possibly acting on them) with no replies or indication that it has happened to the outside world? Such a case would require checking for listener processes rather than just shouting at the computer and waiting for echoes.	[reply]
Re^6: Proving a UDP port is closed by davis (Vicar) on Feb 01, 2011 at 15:52 UTC
Another good point. I suppose I could have "nc -lu 111" or similar running, and that might appear to be the same as "unreachable". I think this is nudging me down the netstat/lsof route... davis	[reply]

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