Hi group,Maybe someone can help me with this question - as I am usually only looking at L4 and the top side of L3 ;)
In order to validate a peculiar switches behavior, I want to adjust some fields in gracious arps sent out by an interface, after a new IP is assigned or changed.
I believe BPF can effectively filter on arbitrary bit patterns and modify packets on the fly.
However, as ARP doesn't seem to be accessible in the ipfw infrastructure, I was wondering how to go about setting up an BPF to tweak (temporarily) some of these ARPs to validate how the switch will behave.
(I need to validate, if there is some difference when the target hardware address doesn't conform to RFC5227 - which states it SHOULD be zero and is ignored on the receiving side; i have reasons to believe that the switch needs either a target hardware address of ff:ff:ff:ff:ff:ff or the local interface MAC, to properly update it's entries.)
Thanks a lot! Richard
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