Beefy Boxes and Bandwidth Generously Provided by pair Networks Frank
laziness, impatience, and hubris
 
PerlMonks  

Re^5: Proving a UDP port is closed

by Anonymous Monk
on Feb 01, 2011 at 15:29 UTC ( #885517=note: print w/ replies, xml ) Need Help??


in reply to Re^4: Proving a UDP port is closed
in thread Proving a UDP port is closed

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.


Comment on Re^5: Proving a UDP port is closed
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

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://885517]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (8)
As of 2014-04-18 07:05 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    April first is:







    Results (462 votes), past polls