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Use this window to create and configure a DNS (Domain Name System) group object. This object represents a DNS client on the 

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capable of communicating with external DNS servers to resolve domain names.

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To View DNS Groups

On the

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main screen, go to Configuration > System ProvisioningCategory: Base Provisioning >DNS > Servers > DNS > DNS Group or 
All > Address Context > DNS GroupThe  DNS Group window is displayed. Select an Address Context to display only the DNS Groups configured within the selected Address Context.

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1DNS Group


To Create a DNS Group

To create a new DNS Group:

  1. In the DNS Group window, select the Address Context within which you want to create the DNS Group.   

  2. Click New DNS Group. The Create New DNS Group window is displayed.

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    1Create New DNS Group Window

     


  3. Use the following table to configure the options and then click Save.
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1DNS Group Parameters


Parameter

Description

Name

Specify the name for the DNS Group of upto 23 characters. This field is mandatory.

Type

Specify the interface type to use for DNS queries. The options are:

  • IP

  • Mgmt

  • None (default)

Based on the type chosen, the additional options open.

Transport

Select the transport protocol to communicate with the DNS servers.

  • UDP (default)

  • TCP 

Mgmt Interface

Select the management interface group for the management interfaces.

Note: This field displays only when the selected Type  is Mgmt.

IP Interface

Select the IP interface group for the packet interfaces.

Note: This field displays when the selected Type is IP.

Use Configured Dns Server

When this flag is disabled,  the 

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stores "Authoritative" NS records received in Domain Name System (DNS) query responses and uses them to locate a closer DNS server for subsequent DNS queries. There are cases where an “Authoritative” server might not be directly reachable from the SBC, or IP ACL rules ( configured on the SBC) blocks its query responses. This block causes the DNS queries to fail and subsequent call failures.

When this flag is enabled, the 

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supports using the configured DNS for external the DNS queries within that DNS group. It sends the DNS queries to the DNS server in the DNS group and ignores Authoritative servers.The options are:

  • Disabled (default)

  • Enabled

Edns Support

Enable this flag to support Extension mechanisms for Domain Name Systems (EDNS) for statically configured and dynamically learned DNS servers. The options are:

  • Disabled (default) 

  • Enabled

DNS Fallback

Disable this flag to send an EDNS request towards the DNS server irrespective of any DNS failure response received in the past.

If this flag is enabled and EDNS failure error response is received for a query, then the SBC stops sending

an

further EDNS

request

requests towards the DNS server

for DNS failure error responses or configuration values

. Instead,

it sends only a

regular DNS query

towards

is sent to the DNS server.

Refer to sonusSbxDnsServerEdnsFailureNotification - CRITICAL, for additional details.

  • Disabled 
  • Enabled (default)
Rcode Error Monitor Timer

Configure the RCODE error monitor timer interval to allow the SBC to monitor RCODE errors. When the timer value is 0, this feature is disabled.

Range: 0 - 60 minutes

Default: 0 minutes


To Edit a DNS Group

To edit a DNS Group object:

  1. Click the option button next to the DNS Group you want to edit. The Edit DNS Group window opens.
  2. Modify the options as needed and click Save.

To Delete a DNS Group

To delete a DNS Group:

  1. Click the option button next to the DNS Group that you want to delete.
  2. Click the Delete icon at the end of the highlighted row. 
  3. Confirm the deletion when prompted.

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DNS Group Commands

Use DNS Group commands to perform manual actions against a configured DNS Group.

To use DNS Group commands for any specific DNS Group, select the option next to the specific DNS Group. The DNS Group Commands window is displayed at the bottom of the window.

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1DNS Group Commands

Clear Cache

Use the Clear Cache command to clear the cache of a specified record.

  1. Choose Clear Cache in the Commands list and click Select. A clearCache dialog box opens.

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    1Clear Cache


  2. In Domain Name text box, enter the name of the domain record you want to clear from the cache.
  3. In Record Type drop-down, select the type of DNS record to clear. The options are:
    • A
    • Aaaa
    • Ns
    • Srv
    • Naptr
    • Default (default)
  4. Click clearCache.

DNS Server Reset

Use the DNS Server Reset command to reset all the DNS server statistics.

  1. Choose DNS Server Reset  in the Commands list and click Select. A dnsServerReset dialog box opens.
  2. Click dnsServeReset.
  3. Confirm the action at the prompt.

Query

Use the Query command to send a DNS query to a specified server.

  1. Choose Query in the Commands list and click Select. A query dialog box is displayed.

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    1Query Command


  2. Use the following table to enter parameters for the query and click query.
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1Query Parameters


ParameterDescription
DNS ServerEnter the name of the DNS Server to perform lookup.
FQDNEnter the domain to perform look up.
Record Type

Specifies the type of DNS records.

  • A (default)
  • Aaaa
  • Ns
  • Srv
  • Naptr


Update Ttl

Use the Update Ttl command to to update the TTL (Time To LIve) value in the cache for a specified record.

  1. Choose Update Ttl in the Commands list and click Select. An update Ttl dialog box is displayed.

    Caption
    0Figure
    1Update Ttl Command


  2. Use the following table to select the record to update and click updateTtl.
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1Update Ttl Parameters


ParameterDescription
FQDNEnter the FQDN whose record to update in the cache.
Record Type

Specifies the type of DNS records.

  • A (default)
  • Aaaa
  • Ns
  • Srv
  • Naptr
TtlEnter a new TTL value.



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