Help finding a compatible NIC

I'd go for an Intel PRO/1000 card. They're not super expensive and really good, em(4).
 
The FreeBSD hardware list for Ethernet interfaces is about 10 years old and doesn’t help https://www.freebsd.org/releases/13.0R/hardware/#support
That is the Hardware Notes of FreeBSD 13.0-RELEASE, which is End of Life. Try 13.1-RELEASE .

I bought a tp-link tg3468 ...
The TP-Link TG-3468 (version 2) should be supported:

sys/dev/re/if_re.c
Code:
191         { NCUBE_VENDORID, RT_DEVICEID_8168, 0,
192             "TP-Link TG-3468 v2 (RTL8168) Gigabit Ethernet" },
Maybe your card is another version and missing its device ID in the driver source. Without the correct device ID the driver won't attach.

If you want to try to check the support of that card before buying another card, please post pciconf -lv | grep -B3 network. If the case is the missing device ID, it would be necessary to build a custom kernel from source (don't worry, it's easy).

FreeBSD didn’t see the Nic.
Which FreeBSD version are you running? Post uname -a .
 
I good general rule of thumb is that any nic with a intel chip-set will probably give you the fewest instances of incompatibility. Used or Refurbished intel nics can be had for between $10 to $25.
 
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