too long mac address

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I am running DHCP version 1.17.  From my logs sometimes intermittently I
receive very long mac addresses.
 
Jan 29 09:19:07 skye dhcpd: DHCPDISCOVER from
52:41:53:20:90:41:f4:13:47:3e:c2:01:01:00:00:00 via 193.x.y.2: network
MOORE6: no free leases
 
Does anyone know what causes this: I'm running a Windows relay agent.
 
Thanks
 
 
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Bernadette Boyle
Glasgow G4 OBA
0141 331 8822
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