You're largely correct, pfSense has - sometimes - issues with Broadcom NICs.
If you search the mailing list archives and the bug tracker you'll see a number
of reports/complaints.
Many of these issues have been fixed since the 1.x era, but there are still
occasional compatibility issues.
The NIC troubleshooting steps often resolve the issue (at least well enough for
daily use), but not always. IIRC, there are a couple modern Dell PowerEdge
servers (R700, maybe?) that essentially can't be used with pfSense's NIC
drivers at all. It's possible your IBM is going to be another problematic
platform until the project releases a FreeBSD-9-based version.
I've only ever heard of these problems affecting LOMs (onboard ports) but that
could be coincidence...
I know I've done two similar Dell servers where one works great and the other
now has a dual-port Intel NIC card in it, as that works much more reliably.
Good luck,
-Adam
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