[Xorp-users] Click configuration generator on XORP

[Rafael Paoliello Guimaraes]

Hello,

I was taking a look at the configuration file generated by XORP to be 
used in Click and there is a point that I didn't really understand.

Whenever an interface receives an ARP Reply, makes n+1 copies of it 
(through the Tee element) and send one copy for each of the n interfaces 
(in fact to their ARPQuerier element) and 1 copy to the host (in the 
case that click is running in user-level, this last ARP reply is 
discarded).

Why does an ARP reply need to be sent to the ARPQuerier of other 
interfaces? Is there any case where a packet may be waiting an ARP reply 
to be sent through an interface and this ARP reply comes from another 
interface? Am I missing something?

Best regards,

-- 

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  Rafael Paoliello Guimaraes
  PhD Student - Computer Networking Group
  Department of Computer Architecture (DAC)
  Polytechnic University of Catalonia (UPC)
  Phone: +34-934017187   Fax: +34-934017055
  URL: http://people.ac.upc.es/rpaoliel
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