[erlang-questions] clarify: gen_udp Set outbound ip address

mog mogorman@REDACTED
Wed Nov 14 15:52:16 CET 2007

Thanks for all the advice, however, clustering is secondary to fault
tolerance to me.  I really am trying to build a system with 9 9s of
reliability.  So I really need a way to have a cloud of computers
running under one ip.  I imagine i could use a mirrored switch and then
forge the udp packets, but I was trying to do this without any custom
hardware.  Has anyone developed a system like this? and If not how did
you reach such high levels of reliability.

On Wed, 2007-11-14 at 09:19 +0100, Fredrik Thulin wrote:
> mog wrote:
> > It seems you are correct, which sucks, multicast seems to be a one way
> > street.  You are correct my goal was to have a cloud of machines hidden
> > behind multicast ip, i found a nifty program called packeth that allowed
> > me to forge the packets and all my linux boxes do drop packets that come
> > from a multicast ip although ethereal can see them.  Is there anyway to
> > achieve my goal of having a cloud of machines hidden behind one ip?  I
> > wanted to be able to have cluster of machines all dealing with this
> > data, i guess i can fall back to my second idea having a fast failover
> > system like carp, but then im back to a 1-1 failover model instead of a
> > cluster.  Is anyone doing anything like this
> To jump right into this thread without reading back through it...
> Other alternatives is using DNS for load sharing (won't help much with 
> failing nodes though), using a load balancer or use some kind of anycast 
> setup (heavily used for example by the DNS root servers).
> The last one is where you use routing to get traffic destined for a 
> certain IP address to end up at different destination hosts based on for 
> example the region the traffic is sourced from, but discussing that 
> would be quite off topic for this mailing list - use google to search 
> for example "dns anycast" to learn more.
> /Fredrik
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