VNC, in particular, has an alternative mode of operation that avoids the
loopback issues altogether; maybe you were using that when you tested.
More importantly, most client-server applications -- like VNC for
example -- use only TCP connections. OpenSim uses both TCP and UDP.
Additionally, the Linden viewer receives capability URLs from the
servers. These are opaque URLs generated from the configuration
variables in the regions' ini file that must literally match certain
comparisons that the viewer performs, and if those comparisons fail, the
viewer refuses to connect.
UDP and capability URLs are the two things that make OpenSim networking
more complicated than most C/S apps.
I'm yet to encounter a network that I can't configure to run OpenSim,
but that is not to say that there aren't some out there, especially if
the routers don't do good on UDP.
Mike Loveridge wrote:
Hi to anyone that works on the network communications between client &
server,
I worked for months trying to get my pfSense router to work with
opensim. I worked with pfSense to have them verify that loopback was
indeed enabled and that loopback rules were being created. We verified
that other client/server applications were now working, for example,
VNC. I went though many things with the OSGrid people as well and got
feedback from both the opensim users and developers, and yet, nothing
worked.
I finally resorted to buying a Linksys router that runs DD-WRT and got
it to work. This proves that it was the router all along as I had
suspected. However, the router was doing its job. I really regret
having to leave the pfSense router solution since it provides more
services that a consumer router. Fortunately, pfSense and DD-WRT are
very similar.
My point, question, or statement here is, was this really necessary?
What makes opensim so much more complicated that normal loopback won't
work? Why do other client/server apps work when they are both behind
the same router? It's hard for me to think that opensim is a far more
"special case" of a client/server setup that is using the same router.
It seems opensim must be doing something more complicated than is
necessary. In fact, to the point that NAT loopback working for others
doesn't work for opensim.
Does anyone have an explanation that would help me understand what the
difference is or is this something that eventually needs to get
addressed in opensim network communications?
Thanks,
Mike
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