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This object creates and configures a DNS group object, a DNS Client on the SBC capable of communicating with external DNS servers to resolve domain names.
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To View DNS Group
On the SBC main screen, go to Configuration > System Provisioning > Category: Base Provisioning >DNS > DNS Group. The DNS Group window is displayed.
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To Edit DNS Group
To edit any of the DNS Groups in the list, click the radio button next to the specific DNS Group name.
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The Edit Selected DNS Group window is displayed below.
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Make the required changes and click Save at the right hand bottom of the panel to save the changes made.
To Create DNS Group
To create a new DNS Group, click New DNS Group tab on the DNS Group List panel.
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The Create New DNS Group window is displayed.
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The following fields are displayed:
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| Name of the DNS Group. Must be 1-23 characters. This field is mandatory. | |||||
| Specifies the Interface type. Based on the type, the following Interface will be displayed:
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| The transport protocol to use to communicate with DNS servers.
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| Specifies the management interface group name.
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| Specifies the IP interface group name.
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| The configured DNS server, when enabled, is used to resolve domain names that do not exist in local cacheWith the option disabled, the SBC stores "Authoritative" NS records received in Domain Name System (DNS) query responses and uses them for locating a closer DNS server for subsequent DNS queries. There are cases where an “Authoritative” server may not be directly reachable from the SBC, or its query responses are blocked by IP ACL rules configured on the SBC. This causes DNS queries to fail and subsequent call failures. With the option enabled, the SBC supports using the configured DNS for external 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:
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| Enable flag to support Extension mechanisms for Domain Name Systems (EDNS) for statically configured and dynamically learned DNS servers. The options are:
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To Delete DNS Group
To delete any of the created DNS Groups, click the radio button next to the specific DNS Group which you want to delete.
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Click Delete at the end of the highlighted row. A delete confirmation message appears seeking your decision.
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Click Yes to remove the specific DNS Group from the list.
Include Page DNSGroup_delete_rule DNSGroup_delete_rule
DNS Group Commands
To view the DNS Group Commands for any specific DNS Group, click the radio button next to the specific DNS Group to highlight the row.
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The DNS Group Commands window is displayed at the bottom of the screen.
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The option displayed is:
Clear Cache: Clears the cache of matching records.DNS Server Reset: Resets all the DNS server statistics.Query: Performs the DNS query to the server.Update Ttl: Updates the Cache of the matching record with the new TTL value.
Clear Cache
Choose Clear Cache to clear the cache and click Select.
A dialogue box appears seeking your confirmation to execute.
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The following fields are displayed:
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Domain Name | Enter domain to be cleared. |
Record Type | Specifies whether to use the DNS server for just A-record lookups or for full NAPTR/SRV/A lookup as specified in RFC3263. The options are:
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Make the required changes and click clearCache button to confirm. The result of the action is displayed.
Click OK to complete.
DNS Server Reset
Choose DNS Server Reset to reset all the DNS servers and click Select.
A pop window appears seeking your confirmation to execute.
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Click DNS Server Reset button to confirm. The result of the action is displayed.
Click OK to complete.
Query
Choose Query to query a DNS server and click Select.
A pop window appears seeking your confirmation to execute.
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The following fields are displayed:
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| Parameter | Description |
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DNS Server | Enter a DNS Server to be used to perform lookup. |
FQDN | Enter domain to be looked up. |
Record Type | Specifies whether to use the DNS server for just A-record lookups, or for full NAPTR/SRV/A lookup as specified in RFC3263.
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Make the required changes and click query button to confirm. The result of the action is displayed.
Click OK to complete.
Updated Ttl
Choose Updated Ttl to update the cache of the matching record with the new TTL value and click Select.
A pop window appears seeking your confirmation to execute.
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The following fields are displayed:
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| Parameter | Description |
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FQDN | Enter FQDN to be updated from the Cache.. |
Record Type | Specifies whether to use the DNS server for just A-record lookups, or for full NAPTR/SRV/A lookup as specified in RFC3263.
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Ttl | Enter new TTL value. |
Make the required changes and click Updated Ttl button to confirm. The result of the action is displayed.
Click OK to complete.
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