As you know, ping operation actually generates two packets, one is ICMP echo request and one is ICMP echo reply.
Let's say on a P2P link, A end's IP is 10.1.1.1 and B end's IP is 10.1.1.2. When you ping B from A, the source IP is 10.1.1.1 and destination IP is 10.1.1.2. A sends ICMP echo request to B (one way trip delay). B responds back to A with ICMP echo reply (round trip delay).
When you ping from A's IP to A's IP, the source IP is 10.1.1.1 and destination IP is also 10.1.1.1. So A sends out ICMP echo request out of its interface (one way trip delay). B receives it and sees the destination IP is 10.1.1.1 and sends this ICMP echo request back to A (round trip delay). When A receives this ICMP echo request, A generates ICMP echo reply back to 10.1.1.1 and sends it out of its interface. B receives this echo reply and sends it back to A (round trip delay X 2).
This is the reason why when you ping the same IP as the source, the delay is round trip times 2.
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