TCP question.

[Sergei Organov]

Eric Norum <eric.norum at usask.ca> writes:
> Sergei Organov wrote:
> > 
> > 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?
> > 
> 
> Feature.
> 
> If your RTEMS machine has changed its Ethernet or Internet address the
> initial broadcast lets all other hosts on the segment flush any old,
> incorrect, information from their ARP tables.

Thanks, this sounds reasonable.

> This is mentioned in an RFC somewhere, but I don't have the exact reference
> handy. 
> 
> -- 
> Eric Norum                                 eric.norum at usask.ca
> Department of Electrical Engineering       Phone: (306) 966-5394
> University of Saskatchewan                 FAX:   (306) 966-5407
> Saskatoon, Canada.