I'll get it done after finals and before my doctor's appointment later this week. I have a good feeling it is my managed switch.
Edit: It is my managed switch. Brought Node #3 online that has NIC-teaming. Node #1 still isn't working. So during the weekend i'm going to restore to default network interfaces and put together NIC-teaming from scratch. The Zyxel switch is buggy, because the first time I implemented NIC-Teaming, I didn't need to use a LAG group, it just causes a DoS, but now putting together LAG groups for Node #3 works.
Fixed. My Zyxel Managed Switch dislikes my Dell R710 Rackserver with three bonded NICs and one sniffer NIC for SecurityOnion. Apparently I can't give it a LAG group for that. But it has taken a liking for my Dell Precision's bonded NICs.
I'm going to toss this Zyxel away for my Cisco Catalyst during winter break.