Double, double packet trouble: too many NICs, too many problems in three Acts

Act 1 - The Problem Here be known our Complicating Incident. Look at that fancy new server just installed in the rack with 8x HDR 200Gb InfiniBand HCAs on it. WOW. That is going to make your data scientist stakeholders very happy. Linux is installed and it's just dying to consume input. This particular node [...]