21.3.1. Reverse Lookup Settings for Global IP Address Used on Enterprise Cloud 2.0

With the reverse DNS lookup function, this section
explains how to made the reverse lookup settings with the global IP address that was added on Enterprise Cloud 2.0.

21.3.1.1. [Example] Reverse lookup settings

With the items given below, the example here shows how to make the reverse lookup settings for a Virtual Server.

  • IP address of an instance

    192.0.2.5

  • Default IP address reverse lookup record of an instance

    192-0-2-5.compute.jp-e1.cloudn-service.com.

  • Host name to be set to an instance

    reverslookup.example.com.

21.3.1.2. Creating a host zone

Create the host zone of the host name to be set to the instance of a virtual server. This procedure can be skipped if the host zone has already been created.

Refer to Creating Zone and create the host zone with the value below.

  • Domain Name: Enter your domain name.

    In this scenario, enter “example.com” to create the host zone.

21.3.1.3. Creating a recordset for Address record (A record).

Register an A record in the virtual server of Compue.

If the relevant A record has been created or an A record can be resolved by another DNS service, this step can be skipped.

Note

For reverse lookup settings, an A record which allows name solution for the host name set to the instance must be registered. For example, if reverselookup.example.com. is to be set to 192.0.2.5 like this scenario, the A record of 192.0.2.5 must be returned when name solution of reverselookup.example.com. is executed. Whereas this A record does not necessarily need to be registered in the DNS of this service, the procedure using the DNS of this service is presented below.

The procedure using the A record creation function of DNS of this service is described below.

Refer to Creating Zone and register the A record with the value below.

  • Name: Enter the record name.

    In this scenario, enter “reverselookup.example.com”.

  • Type: A record

    To register the A record first, select “A record”.

  • Value: Enter the Virtual Server’s IP address.

    In this scenario, enter “192.0.2.5”.

Check that the registration above has been performed properly. In the example below, the “dig” command is used to check A record registration of “reverselookup.example.com”.

*Command example

Note

“When the IP address expected above is not returned or when no record responses are made, check the following. - * Checking that the linked procedure has been completed properly - dig Using reverselookup.example.com a +trace, check that the zone has been assigned properly.”

21.3.1.4. Creating a recordset for reverse lookup

Refer to ./setting/create-recordset, open the record set creation screen with the target host zone, and enter the following information.

  • Value: Enter the Virtual Server’s IP address.

    In this scenario, enter “reverselookup.example.com”.

  • Type: PTR record

    To set a reverse lookup record, select PTR record.

  • Value: Enter the Virtual Server’s IP address.

    In this scenario, enter “192.0.2.5”.

Reverse lookup of the IP address of the instance is set by setting the IP address currently used.

ECLIPの逆引き

After a few minutes, verify the reverse lookup settings has been made clearly with the command below.

$ dig 192.0.2.5 -x

;; QUESTION SECTION:
;5.2.0.192.in-addr.arpa.  IN  PTR

;; ANSWER SECTION:
5.2.0.192.in-addr.arpa. 60  IN  PTR reverselookup.example.com.

All tasks for the settings are completed by now.

Note

1.A zone must have been created.
2.”It is allowed to set only the IP address of the virtual server currently used (or suspended) with the customer account. * The subaccount of a customer is treated as another account. Be careful with them.”
Reverse lookup configuration cannot be set for global IP addresses used in other contracts or unused global IP addresses.
3.For the record name of a reverse lookup result, be sure to set the IP address above through forward lookup (A record) settings.
4.Reverse lookup settings cannot be made for 30 minutes just after a virtual server is added.
5.When a global IP address having reverse lookup settings made is canceled (returned), the default value is restored for reverse lookup response regarding the global IP address.
The reverse lookup settings, however, are not deleted automatically. When the settings are not needed, delete the settings.
(In the case where a zone regarding reverse lookup settings remains, be careful that the charge for the zone is continued.)