What is 'oui Unknown' message seen in tcpdump ?

Solution Unverified - Updated -

Issue

  • oui Unknown is seen in tcpdump logs like show below:
# tcpdump -vvv  arp -i eth0
10:37:06.660718 arp who-has HOSTNAMEAA tell HOSTNAMEBB
10:37:06.661012 arp reply HOSTNAMEAA is-at 00:50:56:xx:xx:xx (oui Unknown)
  • What is its meaning ?

Environment

  • Red Hat Enterprise Linux (All versions )
  • tcpdump

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