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Re: Traffic Engineering (fwd)
Avi Freedman <[email protected]> writes: > The cyclic stuff in News recently has hammered home that the search > for elegance pays off. I "initially" solved the problem of having > multiple machines with the same IP by postulating IP-stack hackery > involving forwarding any packets that come in for sockets that > don't exist to a central database-forwarder machine that keeps track > of all open tcp sessions on all replicated machines, but it turns > out that there are some much easier non-stack-hackery-mandatory > solutions. Your approach also is not a neat solution for two further reasons. Firstly, it requires maintaining connection state for all connections on a central repository, and secondly, it requires that your network be stable at the point when a connection needs to migrate. You should be able to deal with the case that during the lifetime of a TCP session something causes traffic that was hitting site A suddenly arrive at similarly-numbered site B at a time when connectivity within your network is unstable. (This likely can be done with tunnels, following the NAT approach, if synchronization is between things located at the edges of your network, rather than in a star pattern from something inside your network). You should also avoid scaling limits inherent in dumping lots of traffic at some central host rather than doing content-driven fail-over checkpointing for bulk data transfers from "static" content. Sean. P.S.: do you go about guaranteeing that you have unique connection "names" across all your simliarly-numbered hosts?