first ping fails

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Sometimes when someone starts a ping, it will fail the first packet. What usually causes that?
trojan81Asked:
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epichero22Connect With a Mentor Commented:
It's not the first packet that failed, it's that the request was never sent out. Whenever a router has to send a packet to the next-hop (or directly attached destination) that has no entry in the ARP table, the ARP request is sent out, but the original packet is unconditionally dropped.
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