1. 海思开发板默认状态下自己不能ping通自己，需要 ifconfig lo up，之后就可以自己ping通自己了。如下所示：
/app/komod # ping 192.168.1.21
PING 192.168.1.21 (192.168.1.21): 56 data bytes
^C
--- 192.168.1.21 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss
/app/komod # ifconfig lo up
/app/komod # ping 192.168.1.21
PING 192.168.1.21 (192.168.1.21): 56 data bytes
64 bytes from 192.168.1.21: seq=0 ttl=64 time=0.102 ms
64 bytes from 192.168.1.21: seq=1 ttl=64 time=0.088 ms
^C
--- 192.168.1.21 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.088/0.095/0.102 ms