Re: One group across LAN's

Hi Bela,

I do have another question related to the topic now that I am trying to 
implement it. How do I best set up the TCP group 
between the two separate locations? I mean, with the TCP protocol layers, you 
have to have well know hosts on either 
side so that they can connect to each other. I have two locations, each has for 
example 10 servers using a internal LAN 
address. The firewalls do the NAT so that each location has only one external 
"official" IP address. How would I have to 
set it up so that the two coordinators as discussed of the local LAN UDP 
multicast groups (using view[0] as you 
explained below) can join a TCP group across the internet without them knowing 
each other really?

I assume, a gossip server outside the firewall may help, but then we are back 
to the single point of failure scenario. I 
am confused as how to achieve this?

I assume this is along the G2G project question you have been asked just 
recently.

Thanks and best regards,
Lars


Lars George wrote:
> Thanks Bela, that is what I need to get me started.
> 
> Bela Ban wrote:
>>
>> Lars George wrote:
>>> Hi Bela,
>>>
>>> Thank you for the explanation. One question I have though, I do
>>> understand it that way that I have to configure a server in each
>>> location to relay the messages, ie. when it receives a multicast message
>>> the listener replicates the message and sends it out through the TCP
>>> channel so that the other location gets the message.
>>>
>>> So when you say "doing it manually" that is what you refer to?
>> yes
>>
>>> And how
>>> could I avoid having a single point of failure in this case? Since one
>>> server is handling the TCP group in either location, what does that mean
>>> if one of them fails? Is there a way to dynamically negotiate in each
>>> location which server is doing the relaying?
>> Simply handle the viewChange(): if local_addr equals view[0], then do 
>> the relaying, otherwise not. So this means only the coordinator does the 
>> relaying.
>>
> 
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