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I added a second ethernet port for $10—and it solved 5 networking problems I didn't know I had

I bought a second ethernet port, and I'm shocked I didn't do it sooner ...
CNBC

San Francisco BART trains go dark systemwide due to ‘computer networking problem'

San Francisco's BART trains went dark systemwide Friday morning due to a computer networking problem, the transit agency said on social media. "Due to a train control system problem BART service is ...