I have changed the arp timers with no noticeable effects. I have also cleard arp cahces on all devices attached to the OpenFlow instance with no change, with the exception of mininet as noted in my previous post.
I also note that I never get arp response (json structure) from a "real" switch (HP 3800 with Nashville release).
However, functionally the OpenFlow instance performs as expected with end points able to arp neighbors within the broadcast domain. I have a pyhsical gateway router attached to the OpenFlow instance and it shows correct arp bindings for the neighbors that are active.
If someone can suggest a log that I can view to determine if there is an issue with my controller runtime environment or other test, that would be appreciated.