Thanks Scott! I forgot about the vlan part. So I added that policy to be
loaded, restarted bro, and it appears to be working. woo hoo!
I also had to make a couple additional mods to tunable kernel params:
# in /boot/loader.conf:
# in /etc/sysctl.conf:
## Increase packet capture buffer sizes
## Increase socket buffer limits
Which got rid of the "igb0: Could not setup receive structures" errors
at boot time (dmesg output). But I still have the "pcap bufsize = 0" in
each of the stderr.log log files.
I appreciate all the assistance folks!