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TCP question.

Using latest RTEMS snapshot I've noticed that when my board running RTEMS
boots, it sends arp request of the form ('tcpdump' output, 'rcv' is board
name): 

20:03:42.041796 8:f3:3e:c2:7e:38 Broadcast arp 60: arp who-has rcv tell rcv

As far as I understand, it asks outside world for its own Ethernet address
(and probably is waiting for reply then?). This seems strange as Ethernet
address is specified in the rtems_bsdnet_ifconfig structure. Is it a bug or
feature?

Thanks in advance,
Sergei.