so here it is InuoMicro G4305L8-S2 fanless industrial PC box offers eight 2.5GbE ports for $203 - CNX Software (cnx-software.com)
available on amazon
Not sure a 1700 CPU mark processor would be able to route @ 2.5g, I hope I'm wrong.
https://www.cpubenchmark.net/cpu.php?cpu=Intel+Celeron+4305UE+%40+2.00GHz&id=3628
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I hope you meant NAT as routing is a lot less cpu intensive 
yeah, I did 