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AM1808的网络问题

Other Parts Discussed in Thread: AM1808

大家好:

           我用的是AM1808的板子,自己公司做的。目前linux系统已经起来了.

          问题如下:

                           第一种情况,当linux系统起来之后,我用主机ping开发板,ping不通.

                            第二种情况,当linux系统起来之后,我用开发板ping主机,可以ping通;然后,再用主机ping开发板的时候,也通了.

           求教,为什么主机ping通开发板,需要先用板子先ping一下主机,然后才能实现主机ping开发板.

           谁能帮帮我啊....项目好急啊...

           万分感谢....