Qubes on Hardware Firewall?

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Related discussion

Building a Qubes Router?

Continuing the discussion from Which kinds of sys-* are possible?: Speaking of having more than one sys-net, are there any security benefits to making a Qubes router run on a mini PC with many NICs? Or am I just increasing my attack surface since router firmwares tend to be tiny? Does having multiple independent firewalls increase compartmentalization and offset the increased attack surface? What uses might there be for a Qubes router? Just some random thoughts