In this section:
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.
Note
Each signaling port within an Address Context must use a unique IP address and port number combination.
Note
The SBC 52x0 and SBC 7000 systems support creating IP Interface Groups containing sets of IP interfaces that are not "processor friendly" (i.e. carried on physical Ethernet ports served by separate processors). However, restrictions exist regarding the usage of such Interface Groups.
(This ability does not apply to the SBC 51x0 and SBC 5400 systems which have only two physical media ports. IP interfaces from the two physical ports may be configured within the same IP Interface Groups without restriction.)
For complete details, refer to Configuring IP Interface Groups and Interfaces.
Note
The SBC Core supports up to eight DNS servers per DNS group. The SBC 5000/7000 series platforms support up to 2,048 DNS Groups system-wide. SBC SWe supports up to 128 DNS Groups. See SBC Provisioning Limits for additional provisioning limitations.
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.
DNS Group
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.
DNS - DNS Group Highlighted
The Edit Selected DNS Group window is displayed below.
DNS - DNS Group Edit
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.
DNS - DNS Group Fields
The Create New DNS Group window is displayed.
DNS - DNS Group Create
The following fields are displayed:
DNS Group Parameters
Parameter | Description |
|---|---|
| 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:
|
| The transport protocol to use to communicate with DNS servers.
|
| Specifies the management interface group name. Note
This field appears only when |
| Specifies the IP interface group name. Note
This field appears only when |
| The configured DNS server, when enabled, is used to resolve domain names that do not exist in local cache. The options are:
|
| Enable flag to support Extension mechanisms for Domain Name Systems (EDNS) for statically configured and dynamically learned DNS servers. The options are:
|
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.
DNS - DNS Group Highlighted
Click Delete at the end of the highlighted row. A delete confirmation message appears seeking your decision.
DNS Group Delete Confirmation
Click Yes to remove the specific DNS Group from the list.
Before deleting a DNS group, first delete the DNS local record names and DNS server in that group.
Note
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.
DNS - DNS Group Highlighted
The DNS Group Commands window is displayed at the bottom of the screen.
Dns Group Admin Commands
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.
Clear Cache
The following fields are displayed:
Clear Cache Parameters
| Parameter | Description |
|---|---|
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:
|
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.
Dns Group Commands pop-up
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.
Query Command
The following fields are displayed:
Query Parameters
| Parameter | Description |
|---|---|
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.
|
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.
Updated Ttl Command
The following fields are displayed:
Updated Ttl Parameters
| Parameter | Description |
|---|---|
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.
|
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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