如何实现开发板和虚拟机的互ping啊? 还有就是怎么修改开发板的IP[TANG2440]# ping 10.100.2.2
dm9000 i/o: 0x20000000, id: 0x90000a46
MAC: 10:23:45:67:89:ab
## Warning: gatewayip needed but not set
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
## Warning: gatewayip needed but not set
ping failed; host 10.100.2.2 is not alive