Fix Ubuntu arp settings#38
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The default ARP config in Ubuntu is to reply for MAC requests on any interface for any IP configured on the local interfaces. This breaks networking scenarios (tested with RoCE) where more than one interface with an IP is connected to a network.
The proposed change amends the default behaviour to act as expected - i.e. to reply only if the target IP address is local address configured on the incoming interface. However, the arp role can also be used to amend behaviour as required.