Github user romain-dartigues commented on the issue:
https://github.com/apache/cloudstack/pull/1604
@syed
> there could be a possibility of having an ipv6 gateway
Right, but IPv6 does not use ARP but
[NDP](https://en.wikipedia.org/wiki/Neighbor_Discovery_Protocol) ([RFC
4861](https://tools.ietf.org/html/rfc4861)).
> do we know why the arping is failing?
Apparently because the file "/etc/cloudstack/ips.json" is generated with a
gateway at "None" even when the gateway is present in the input "cmd_line.json"
(but my memory could fail me at this time of the day).
One month ago we found the "problem" and wanted a fix; trying to understand
*why* it did happen made me start #1575 (now #1603).
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