yueyue papa  wrote:
>       I use lwIP ping implelent. I found a strange thing, the ping always lost
> for first pacakge.

It would be normal for an outgoing PING if ARP_QUEUEING==0, and for an incoming 
PING if ARP_QUEUEING==0 and ETHARP_TRUST_IP_MAC==0.

In those cases, for the first packet sent to an IP address there is no ARP 
cache entry, and the packet would be discarded.

Luca


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