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It preserves source ip, so that suggests something like a kernel module, or like Intel's DPDK. Either (practically) rules out anything but C, doesn't it?

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Or they could just encapsulate the packet to preserve the IP...

Happy to be educated. There's some easy way to alter the destination IP that way?

Like mention above IPVS: http://www.linuxvirtualserver.org/VS-IPTunneling.html

This is heavily used by Facebook for their loadblancer on their racks.

Ah, ok. A kernel module, as I mentioned :)

There was a talk about this in SREcon Europe 2015: https://www.usenix.org/conference/srecon15europe/program/pre...

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