From: Martin Pirker <crf@...>
Date: 2004-10-23T08:59:13+09:00
Subject: UDP socket receive question

Hello...

Copying the minimalistic UDP receive example from the online Pickaxe I

require 'socket'
port = 12000
server = UDPSocket.open
server.bind(nil, port)
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