Ce que tu peux tenter :
Connecter la prise RJ45 à la box puis dans le terminal passer la commande :
et donner les résultats.
Last login: Sat Jul 25 18:31:02 on ttys000
imac-de-philippe:~ philippe$ ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
nd6 options=1<PERFORMNUD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=27<RXCSUM,TXCSUM,VLAN_MTU,TSO4>
ether 34:15:9e:26:4e:62
nd6 options=1<PERFORMNUD>
media: autoselect
status: inactive
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether d8:30:62:49:dc:41
inet6 fe80::da30:62ff:fe49:dc41%en1 prefixlen 64 scopeid 0x5
inet 192.168.1.11 netmask 0xffffff00 broadcast 192.168.1.255
nd6 options=1<PERFORMNUD>
media: autoselect
status: active
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
lladdr 34:15:9e:ff:fe:26:4e:62
nd6 options=1<PERFORMNUD>
media: autoselect <full-duplex>
status: inactive
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
ether 0a:30:62:49:dc:41
media: autoselect
status: active
imac-de-philippe:~ philippe$