I am building my personal private cloud. I am considering using second hand dell optiplexes as worker nodes, but they only have 1 NIC and I'd need a contraption like this for my redundant network.
Then this wish came to my mind. Theoretically, such a one box solution could be faster than gigabit too.
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There would be some quality-of-life improvements like being able to replace a switch without pulling down entire cluster, but it is mostly for a challenge.
A good answer to a "why?" question is "why not?" This can be a great learning or practice opportunity for redundant network links and other interface challenges.
Absolutely this. I learned so much on my homelab that at this point has more resiliency than some medium businesses (n+1 switching, vSAN for critical VMs, n+0.5 UPS for 15 minutes)