From: Dan Janowski <danj@3skel.com>
Date: 2004-05-22T03:30:37+09:00
Subject: Re: Multicasting with Ruby?

This particular address is:

  $ host 228.5.6.8
8.6.5.228.in-addr.arpa domain name pointer 
reserved-multicast-range-NOT-delegated.example.com.

An official mcast test address. Find out more about multicast 
addressing here:

http://rfc3171.x42.com/

I'm not sure why Your instance of Red Hat would fail to run. Do you 
have to compile multicast into the Kernel?

Dan

On May 21, 2004, at 11:55, James Britt wrote:

> 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
>
>