ifconfig mystery card

[Live-Wire]

Hi,

I'm configuring an old network card in a 5.4 install, and I have no idea 
what it is (got it from a friend, no documentation or labels, etc.)

running ifconfig I see (besides my localhost lo0 entry):

x10: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
    options=9<RXCSUM,VLAN_MTU>
    ether 00:01:03:20:d5:fd
    media: Ethernet autoselect (none)
    status: no carrier

and yet, running ifconfig x10 i get

"ifconfig: interface x10 does not exist"

Hmm ... what am I missing?

- JK