OPNsense/pfSense on the HP T730: Use Broadcom NICs, not Intel
I recently picked up an HP T730 as my OPNsense firewall, mainly to repurpose my previous HP ProDesk as a desktop. With that, I also initially tried an Intel NIC primarily because the de-facto NIC choice for OPNsense/pfSense is in fact Intel. To my surprise, the T730 froze with the Intel-based NICs I tried, both igb and em based cards.
Many people have reported on pfSense’s subreddit that certain Intel-based NICs actually do freeze on the T730.
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