ARP (and ND in v6) can affect RTT, which can create jitter.

First set of graphs is just a normal configuration.

Second set of graphs has a ping running in parallel with a 10 second interval between the machines to keep the ARP entry from going stale.

https://dan.drown.org/bbb/arp-impact/ tries to show the impact of ARP on the request latency. Response isn't impacted because the peer learns the ARP entry on the request.

Just thought people would find this interesting.
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