From: Joel VanderWerf <vjoel@...>
Date: 2004-10-23T13:34:05+09:00
Subject: Re: UDP socket receive question

Martin Pirker wrote:
> Hello...
> 
> Copying the minimalistic UDP receive example from the online Pickaxe I
> 
> require 'socket'
> port = 12000
> server = UDPSocket.open
> server.bind(nil, port)
               ^^^
Try a hostname here? You can use the string '<any>'. I guess that means 
any interface.

> loop do
>   text,sender = server.recvfrom(1024)
>   puts text
> end
> 
> 
> localhost --> localhost UDP connections work fine
> 
> 
> so I tried connecting 2 different boxes
> check network connection by netcat:
> 
>   sender: echo "whatever" |netcat -u 192.168.x.y 12000
> receiver: netcat -u -l -p 12000
> connection is ok
> 
> receiver netcat and sender Ruby script work ok, too
> 
> 
> but, with receiver Ruby (like above) neither sender netcat nor Ruby
> script are able to make a transfer -> Ruby receiver drops pakets?!?
> 
> lsof shows a "UDP localhost:12000" binding, so everything should be ok
> on the receiving side
> 
> 
> Question:
> I simply want a Ruby script collecting all UDP pakets arriving at a 
> specific port, above script only works for me localhost-->localhost
> why?
> 
> 
> ruby 1.8.2 (2004-07-16) [i686-linux]   (aka pre1)
> 
> 
> thanks for any hint, I'm out of ideas
> Martin