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...private network (and the firewall) to access the private IPs of computers behind the NAT/firewall. ie. ALPHA BETA 10.0.0.0/8 - CentOS4 - internet - CentOS4 - X.Y.Z.0/24 Private IPs Firewall Firewall Public IPs and NAT now the internet is intracity, within one provider and decently safe (6 hops), but still some sort of encryption would be nice... (otherwise I'd just use ip tunnel). How do I allow both BETA and X.Y.Z.0/24 to connect to the private IPs? Should I use CIPE? IPSEC? something else? any good howtos? Preferably something fa...

...r those of you who don't know anything about MPI, this is a relatively unexplored area, mainly because of the lack of thread-safe MPI implementations (including mine. Oops!). But the more that I thought about it, the more interesting it got, because there's actually a lot of deliciously intracate real-world issues involved. So in between real work (i.e., while waiting for long compiles and the like), I devoted a fair number of cycles to thinking about this. On and off, I've spent the past few weeks writing down many of my thoughts on the topic in a white paper, complete with oodle...