Commits on May 28, 2021

1. remove ARP entries left from previous Cilium run …

   In certain configurations, when node neighbor discovery is enabled [1],
   the neighbor table is populated with PERMANENT entries. If the agent is
   then configured to not use neighbor discovery, those entries are left
   behind, without being garbage collected. This can cause connectivity
   issues across nodes, where it's more likely to happen in the same L2
   network, if a new node reuses an IP address from a previous node and its
   MAC address changes. In a L3 network it is unlikely to happen since the
   ARP entry will be associated with a L3 router and it is less likely to
   change its MAC address.
   
   [1]
   ```
   n.enableNeighDiscovery = n.nodeConfig.EnableIPv4 &&
   	(option.Config.EnableNodePort ||
   		(n.nodeConfig.EnableIPSec && option.Config.Tunnel == option.TunnelDisabled))
   ```
   
   Signed-off-by: André Martins <andre@cilium.io>

   

   aanm committed May 28, 2021
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