incusd/network/ovn: Limit MAC_Binding explosion

This configures OVN so it doesn't fill the MAC_Binding table with every
single MAC address it sees through ARP.

Instead MAC_Binding entries will be generated for the default gateway
only, leading to two entries per network.

Signed-off-by: Stéphane Graber <stgraber@stgraber.org>
Sponsored-by: Buddy (https://buddy.works)

internal/server/network/ovn/ovn_nb_actions.go

@@ -215,6 +215,12 @@ func (o *NB) CreateLogicalRouter(ctx context.Context, routerName OVNRouter, mayE
 		return ErrExists
 	}
 
+	// Set some options.
+	logicalRouter.Options = map[string]string{
+		"always_learn_from_arp_request": "false",
+		"dynamic_neigh_routers":         "true",
+	}
+
 	// Create the record.
 	operations, err := o.client.Create(&logicalRouter)
 	if err != nil {