When I check connectivity between two neighbour Cisco devices (routers and switches) using standart ping command with default parameters, I frequently see, what first ping probe is timeout and next four are successfull
I suppose what on Ethernet links this is due ARP mechanism. But default ping timeout 2s, ARP Requst/Reply roundtrip on 100 Mbit/s Ethernet is ~ 100 us (I have observed with analyzer).
The same situation on serial point-to-point links, where no ARP exists.
Any Idea, why first ping probe is timeout?
Also I have found this question in Cisco BCMSN Course LAB Guide
On some pings, there was one lost packet (.) and then four good packets. You should know why that occurred.
To understand this behavior I suggest that you start with show arp and look for the destination that you will ping. Then run debug arp and debug ip icmp. Then try the ping. This should help to clarify what the router does if the destination is not in the arp table and how that impacts the first ping.
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