Nuno Carvalho <[EMAIL PROTECTED]> writes:
> Hi Anton,
> If both controllers are in the same LAN and you have multicast between the
controllers, you DO NOT need a gossip server. You can use Appia out of the box.
Neil needed something different, with SSL tunnels and different views of the
controller's addresses, and that why we improved Appia a little bit to allow
more configurations.


Hi Nuno,
Please see the comments below:
I don't want to use multicast. Controllers can be on a WAN. So I'd rather use
some form of unicast with gossip/epidemic protocols, while SSH tunnels and so on
aren't all that important to me.


> 
> Appia uses a gossip SERVICE to discover new members and merge concurrent
membership views. This service runs in one of the protocols of all members and
they only need some type of communication for the initial discovery messages.
This can use a multicast address OR a simple server that only forwards discovery
messages to other members that it knows. This server acts just like a proxy and
can be replicated by running several instances in different machines.
> 
Wonderful! That's what I need - an ability to run more that 1 gossip server with
authomatic switch of clients if one of them is down and no multicast.
Anton




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