NIC detected in setup but not after install

[JdeFalconr]

Thanks in advance for your help.

Not quite sure what to make of this; when I went through the setup process and the live installer (19.7 VGA image) it had no problem detecting a PCIE NIC I have (based on the Intel 82576 chipset; yes it's on the HCL). However once I installed OPNSense it lost track of the NIC and no longer detects it at all. Based on https://www.freebsd.org/cgi/man.cgi?query=igb&sektion=4&manpath=freebsd-release-ports I'm not sure if this driver is auto-loaded or if I have to load it myself somehow. If the latter I have no idea whatsoever how and I don't see anything about it in documentation. I can see some lines about the devices in logfiles so I know they're being detected, I just don't understand why they don't show up. If I get into shell as root and do an ifconfig this NIC isn't listed (unsurprisingly).

I'll freely admit now that I know next to nothing about Linux, in case you couldn't tell already. Also in case it helps I have an Intel J3455 board (ASRock J3455B-ITX).

After some Google searching I tried editing my /boot/loader.conf/local file to add the line "if_igb_load="YES"" per the above website but that didn't help. I've since removed that file (as it didn't exist before I created it).

A few lines of logfile I find when I search for the interface name ("igb"):

Sep 13 05:02:16   kernel: Module pci/igb failed to register: 17
Sep 13 05:02:16   kernel: module_register: cannot register pci/igb from kernel; already loaded from if_igb.ko
Sep 13 04:59:38   kernel: Module pci/igb failed to register: 17
Sep 13 04:59:38   kernel: module_register: cannot register pci/igb from kernel; already loaded from if_igb.ko
Sep 13 10:23:19   opnsense: /usr/local/etc/rc.bootup: Warning! dhcpd_radvd_configure(auto) found no suitable IPv6 address on igb1
Sep 13 10:23:13   opnsense: /usr/local/etc/rc.bootup: Accept router advertisements on interface igb0
Sep 13 10:23:13   opnsense: /usr/local/etc/rc.bootup: The command '/sbin/dhclient -c '/var/etc/dhclient_wan.conf' -p '/var/run/dhclient.igb0.pid' 'igb0'' returned exit code '1', the output was 'igb0: no link .............. giving up'
Sep 13 10:23:00   kernel: igb1: netmap queues/slots: TX 4/1024, RX 4/1024
Sep 13 10:23:00   kernel: igb1: Bound queue 3 to cpu 3
Sep 13 10:23:00   kernel: igb1: Bound queue 2 to cpu 2
Sep 13 10:23:00   kernel: igb1: Bound queue 1 to cpu 1
Sep 13 10:23:00   kernel: igb1: Bound queue 0 to cpu 0
Sep 13 10:23:00   kernel: igb1: Ethernet address: <MAC ADDR>
Sep 13 10:23:00   kernel: igb1: Using MSIX interrupts with 5 vectors
Sep 13 10:23:00   kernel: igb1: <Intel(R) PRO/1000 Network Connection, Version - 2.5.3-k> port 0xe000-0xe01f mem 0x92000000-0x9201ffff,0x91400000-0x917fffff,0x92040000-0x92043fff at device 0.1 on pci1
Sep 13 10:23:00   kernel: igb0: netmap queues/slots: TX 4/1024, RX 4/1024
Sep 13 10:23:00   kernel: igb0: Bound queue 3 to cpu 3
Sep 13 10:23:00   kernel: igb0: Bound queue 2 to cpu 2
Sep 13 10:23:00   kernel: igb0: Bound queue 1 to cpu 1
Sep 13 10:23:00   kernel: igb0: Bound queue 0 to cpu 0
Sep 13 10:23:00   kernel: igb0: Ethernet address: <MAC ADDR>
Sep 13 10:23:00   kernel: igb0: Using MSIX interrupts with 5 vectors
Sep 13 10:23:00   kernel: igb0: <Intel(R) PRO/1000 Network Connection, Version - 2.5.3-k> port 0xe020-0xe03f mem 0x92020000-0x9203ffff,0x91c00000-0x91ffffff,0x92044000-0x92047fff at device 0.0 on pci1