[Sugar-devel] Fwd: [Bug 419240] [NEW] Need instructions on how to set up a cluster of computers so they collaborate.

[Benjamin M. Schwartz]

W. Scott Meeks wrote:
> Hi folks,
> 
>>From reading about Collaboration on the Wiki at:
> http://wiki.sugarlabs.org/go/Collaboration the key appears to be:
> 
> You can collaborate "locally" without a server. If you remove the name of
>> the Jabber server from your settings, or it fails to connect for some
>> reason, then Sugar tries to connect locally. Sugar machines will be able to
>> collaborate if they are connected to the same wireless network or wired
>> port. It will not work over your entire LAN, you have to be on the same
>> segment.
>>
> 
> Can someone explain what it means to be "on the same segment" vs. "over your
> entire LAN"?

In general, being "on the same segment" as another user means that you can
communicate directly with that user.  "Directly" is used here in the
Internet Protocol sense: A and B are on the same segment if the total
number of hops between them is 1.

In this specific case, "on the same segment" is used to mean "can
communicate via IP multicast".  On most LANs, routers are not configured
to propagate multicast messages between segments, so the local
collaboration (which uses multicast) can only work within one segment.  If
you configure your routers to propagate multicast messages between
segments, then link-local collaboration will work over the whole LAN...
until you have so many users that the required bandwidth exceeds the
network capacity.

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