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R: [lwip-users] about PING timeout for first package
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From: |
Ceresoli Luca |
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Subject: |
R: [lwip-users] about PING timeout for first package |
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Date: |
Wed, 15 Apr 2009 15:17:07 +0200 |
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