This article describes how to change the D.ROOT-SERVERS.NET address record with the new IPv4 address.

Background

The D-Root is changing the IPv4 address from 128.8.10.90 (known as TERP.UMD.EDU) to 199.7.91.13. NetScaler appliance, which acts as a DNS resolver, uses the default DNS root hints file. This hints file currently has the entry for D-Root pointing to the old IPv4 address. When the old IPv4 address of D-Root is completely withdrawn from operation, the appliance might fail to resolve some domain names which can result in network reachability issues. D-Root is one of the authorities listed for the DNS root zone and the .ARPA TLD. D-Root is administered by the University of Maryland.

---

Instructions

To avoid any networking issues because of the D-Root change, the NetScaler DNS address record for the D.ROOT-SERVERS.NET must  be changed to point to the new IPv4 address.

To change the D.ROOT-SERVERS.NET address record and to point to a new IPv4 address, complete the following procedure:

1. Delete the existing D.ROOT-SERVERS.NET address record, as shown in the following screen shot:

   

2. Add new address record for D.ROOT-SERVERS.NET with the new IPv4 address.

   

3. Save the configuration.

Run the following commands to complete the preceding procedure from the command line interface:

​>rm dns addRec d.root-servers.net

>Done
>
>add dns addRec d.root-servers.net 199.7.91.13 -TTL 3600000
>Done
>
> show dns addRec d.root-servers.net
1) Host Name : d.root-servers.net
Record Type : ADNS TTL : 3600 secs
IP Address : 199.7.91.13
Done
>save config
>Done

Note: The D-Root IPv6 address is not changed. Therefore, there is no impact on IPv6 address.

This article describes how to change the D.ROOT-SERVERS.NET address record with the new IPv4 address.