請問ifconfig -a

只出現

lo0: flags=1000654<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
eri0: flags=1000612<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 146.21.14.101 netmask ffffff00 broadcast 146.21.14.255

沒出現mac address如xx:xx:xx:xx:xx:xx
是怎麼了?
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