????ARP???
???????????Э?饗ARP??????????IP??????????????????????????????????MAC????????ip?????neigh????neighbour????????????????????????????豸??MAC?????
????$ ip neighbour

???????netlink???
????????????ip?????netlink?????monitor???????????????豸?????????磬????????????????????????????????????REACHABLE????STALE??????????????
????$ ip monitor all

?????????????????
????????????ip?????up??down????????????????????ifconfig???÷??????
??????????????У???ppp0?????????????????????μ???????????????????·???????????????????wlan0????eth0????ppp0???????????????????ɡ?
????$ sudo ip link set ppp0 down
????$ sudo ip link set ppp0 up

???????????
????????????????????????????????????????????????????help??man??沢??????????????????ip??????????????????????????????
???????磬?????????route????????????
????$ ip route help

????С??
??????????????????????е?Linux????????ip??????????????????????ifconfig???????????????д??????