MAC addresses are resolved to IP addresses/host names in ARP packets, even if "Use an external network name resolver" is disabled until Wireshark is restarted.
This issue was migrated from bug 15468 in our old bug tracker.
Original bug information:
Reporter: Christopher Maynard
Status: UNCONFIRMED
Product: Wireshark
Component: Dissection engine (libwireshark)
OS: Windows 10
Platform: x86-64
Version: 2.6.6