[Spread-users] Re: Re: Re: Multicast help

[Yair Amir]

Hi Mark,

So that means that there is a problem in your operating system setup - it does not
allow to join the multicast address, so you cannot receive these messages.
The code discovers it and lets you know.

You can either use the broadcast address or set the OS to allow to join
IP multicast groups (which I have no good suggestion on how to do this in
your system). Once the spsend - sprecv programs show that it is possible
to use such IP multicast groups on your network / operating system then
I am pretty sure Spread will also work using multicast.

Cheers,

	:) Yair.

Mark Snelling wrote:
> Using the multicast address 239.0.1.3, spsend seems to send ok. sprecv 
> however returns the following error...
> 
> DL_init_channel: problem in setsockopt to multicast address -285212413
> Exit caused by Alarm(EXIT)
> 
> It seems any valid class D multicast address produces the same error.
> 
> Cheers,
> 
> Mark.
> 
> "Yair Amir" <yairamir at cs.jhu.edu> wrote in message 
> news:443E43EE.3040207 at cs.jhu.edu...
>> Hi,
>>
>> When there is only one daemon in the segment, the segment
>> multicast/broadcast address is never used (of course).
>>
>> I think there is a problem in your network setup. To verify
>> it has nothing to do with Spread, just use the spsend and sprecv programs
>> that are provided with Spread and see if the multicast addresses
>> you are using actually work as expected in your network. These
>> are very simple programs that help (without Spread) see if the
>> network behave as you tell Spread it should - i.e. that the unicast
>> addresses and the multicast addresses really work on your network
>> as expected.
>>
>> Cheers,
>>
>>   :) Yair.
>>
>>
>> Mark Snelling wrote:
>>> In answer to your questions, all daemons are using Windows XP SP2. I've 
>>> successfully got it working on our networks broadcast address. It seems 
>>> to work with that multicast address if there are no other nodes specified 
>>> in the segment. ie simply
>>>
>>>
>>> Spread_Segment 239.0.1.3 {
>>>
>>>       wcc014 192.168.147.54
>>> }
>>>
>>>
>>> Thanks,
>>> Mark.
>>>
>>>
>>> "Ryan Caudy" <rcaudy at gmail.com> wrote in message 
>>> news:e46e06eb0604130325x22ed7053s47dce01bb91c157e at mail.gmail.com...
>>> To the best of my knowledge, this problems is a new one.
>>>
>>> It sounds to me like there may be a windows-specific bug or
>>> incompatibility.  Can you fill in a bit more information about which
>>> versions of Windows you're using?
>>>
>>> The multicast address you're using appears valid, but can you try with
>>> a different multicast address or with the correct broadcast address
>>> for your network, to see if it's still a problem?
>>>
>>> Cheers,
>>> Ryan
>>>
>>> On 4/13/06, Mark Snelling <mark at bakedbeans.com> wrote:
>>>> Is anybody able to help me with this?
>>>>
>>>> "Mark Snelling" <mark at bakedbeans.com> wrote in message
>>>> news:e15v06$ar4$1 at sea.gmane.org...
>>>>> Hi
>>>>>
>>>>> I'm trying to set up a simple multicast segment with three Windows
>>>>> machines. My spread.conf simply has the lines below:
>>>>>
>>>>> Spread_Segment 239.0.1.3 {
>>>>> wcc013 192.168.147.187
>>>>> wcc014 192.168.147.54
>>>>> wcc035 192.168.147.43
>>>>> }
>>>>>
>>>>> However when I try and run spread, I get the following messages and the
>>>>> daemon terminates:
>>>>>
>>>>> Successfully configured Segment 0 [239.0.1.3:4803] with 3 procs:
>>>>>                      wcc013: 192.168.147.187
>>>>>                      wcc014: 192.168.147.54
>>>>>                      wcc035: 192.168.147.43
>>>>> Finished configuration file.
>>>>> Hash value for this configuration is: 432108239
>>>>> Conf_load_conf_file: My name: wcc014, id: 192.168.147.54, port: 4803
>>>>> DL_init_channel: problem in setsockopt to multicast address -285212413
>>>>> Exit caused by Alarm(EXIT)
>>>>>
>>>>> I've read the user guide but it sheds no light on this.
>>>>>
>>>>> Any help appreciated.
>>>>>
>>>>> Mark.
>>>>
>>>>
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>>>>
>>>
>>>
>>>
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> 
> 
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