FAQ（ECL2.0）

Logical Network - FAQ

• All(29)
• Operation(2)
• Specification(17)
• Construction(10)

• When I create a logical network after creating a new tenant, the status becomes an error and creation fails.ECL2.0, Logical Network

  In some cases, you may receive an error for certain configuration changes, such as Network creation, directly following the creation of a new Tenant. If this occurs, simply retry the configuration change after 5 minutes.

  Reference: Tutorials - How to Create & Connect Network

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• After creating a new tenant, an error occurred when creating a logical network.ECL2.0, Logical Network

  In some cases, you may receive an error for certain configuration changes, such as Network creation, directly following the creation of a new Tenant. If this occurs, simply retry the configuration change after 5 minutes.

  Reference：Tutorial - How to Create & Connect Networks

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• In order to connect the logical network to the bare metal server, an IP created which named "Fixed IP" when creating the port. What is Fixed IP?ECL2.0, Logical Network

  "Fixed IP" represents the IP address assigned from the logical network.

  If you did not manually specify the address when creating the bare metal server, automatically sets the lowest number of unused addresses within the IP address allocation range.

  * Service Descriptions
  https://ecl.ntt.com/en/documents/service-descriptions/rsts/network/logicalnw.html#id12

  https://ecl.ntt.com/en/documents/service-descriptions/rsts/server/Baremetal-server/features.html#id10

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• Is it possible to use asymmetric communication (communication in which traffic go and return are separate routes)?ECL2.0, Logical Network

  In Enterprise Cloud 2.0, asymmetric communication may not be able to communicate.

  Please design so that traffic going and returning are symmetric communication with the same route.

  Target menu

  · Virtual server

  · Firewall

  · Load balancer

  · Network type security  

   

  Asymmetric communication example 1

  When multiple interfaces are used, partial communication may be asymmetric communication.

  Please add individual static routes and design to be symmetric communication.

   

  Asymmetric communication example 2

  When VRRP redundancy is performed with multiple interfaces if the VRRP state (Master / Backup) is different Transit communication is asymmetric communication.

  Make VRRP statuses consistent and design to be symmetric.

  Please refer to the tutorial for detailed configuration example of firewall/load balancer.

   

  Asymmetric communication example 3

  If you use the DSR (Direct Server Return) function on the load balancer, the return communication will cause the load balancer Since it does not pass through, it becomes asymmetric communication.

  Please do not use the DSR function and design it as target communication.

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• I want to use one virtual NIC to set two or more IP addresses (a primary IP, a secondary IP, and so forth). Can I do this?ECL2.0, Logical Network, Virtual Server

  You may be able to assign two or more IP addresses to one NIC on a virtual server if you use a fixed IP address (fixed IP) on a logical network to set two or more IP addresses to one port and set the added IP addresses on the OS. We are sorry for your inconvenience, but this function is not supported on virtual servers. The customers can implement it on their own responsibility.
  Note that you can add the registrations of IP addresses as fixed IP addresses (fixed IP) but you cannot delete a specific IP address you have added. Be careful because you need to delete the port if you want to delete registered IP addresses.
  *As shown in the service description about the restriction, one IP address should be assigned to one NIC in principle.

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• Can I set a global IP address given by a provider other than ECL2.0 on the Logical Network?ECL2.0, Logical Network

  The customers can assign a global IP address legitimately acquired by their company on a logical network. The system does not have such limitation.
  In the case of a VPN connection, there is no limitation on the IP addresses you can set to a destination network on a static route. Therefore, the customers can use a global IP given by a third party for a route advertisement on a UNO network.
  In the case of an Internet Connectivity, the IP addresses you can set to a destination network on a static route are limited only to the global IP's acquired in the ECL2.0 service. Therefore, the customers are not allowed to advertise a global IP address acquired from anywhere else on the Internet.

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• Is it possible to allocate IP address manually when DHCP is available?ECL2.0, Logical Network

  Even when DHCP is available, you can allocate IP address manually within IP address assignment pool.

  When DHCP is available and you do not specify IP address, IP address will be allocated from IP address assignment pool automatically.

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• When five logical networks have already been created, will the logical network for the Managed Firewall (the sixth or later) be charged?Billing, ECL2.0, Logical Network, Network-based Security

  It will be charged.

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• Can I change (delete) the Fixed IP already assigned to a port?ECL2.0, Logical Network

  Fixed IP already assigned to the port of the logical network can not be changed (deleted). Only addition is possible.

  Fixed IP can be changed (deleted) by deleting/recreating the port.

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• Do I need to match the IP address displayed on the portal (the fixed IP address specified for the port of the logical network) with the IP address of the guest OS (the virtual server belonging to the logical network)?ECL2.0, Logical Network

  Yes, you need to match the IP addresses(which is displayed on the portal and of the guest OS)

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