From: James Britt <jamesUNDERBARb@...>
Date: 2004-05-22T00:55:55+09:00
Subject: Re: Multicasting with Ruby?

Daemon Le wrote:

> Thanks Dan!  It worked beautifully.  Changing "host" to "addr" (OK, that 
> was dumb on my part), getting rid of the connect, and doing 
> IP_ADD_MEMBERSHIP after bind fixed all my current woes.  Here's with your 
> corrections as it runs on the Redhat Linux box...
> 
> --- begin ----------------------------------------
> require 'socket'
> 
> port  = 1212
> addr  = '228.5.6.8'

Pardon my networking ignorance, but in this example, where does the 
address 228.5.6.8 come from?  Or does it matter much?

I'm trying learn more about multicasting, but when I run the example on 
my Red Hat box I get

   mcast.rb:13:in `setsockopt': No such device (Errno::ENODEV)

where line 13 is
  sock.setsockopt(Socket::IPPROTO_IP, Socket::IP_ADD_MEMBERSHIP, mreq)

ruby -v gives:
   ruby 1.8.1 (2003-12-25) [i586-linux]


Thanks,


James