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This section provides an example for configuring DNS Groups and explains how to configure DNS A/SRV and NAPTR queries.

Configure DNS Groups

The

Spacevars
0 product

 supports domain-name resolution via external DNS servers. Each IP address context defines one or more DNS server groups, each containing up to eight DNS servers. The zone and/or SIP Trunk Group then indicates which DNS Server Group to use for requests requiring DNS resolution.

When a DNS group is configured at the Address Context level for an interface, it must also be configured at the Zone level in that Address Context. For example, the CLI command examples listed below accomplish the following:

1. Configure DNS group "DNG-1" for Address Context "default" to include IP interface type, local resource record and DNS server settings.
   
   

2. Set DNS group to zone within Address Context.

   Code Block
   language none
   % set addressContext default dnsGroup DNG-1 type ip interface IPIG-1 % set addressContext default dnsGroup DNG-1 localRecord RECORD1 data 1 hostName HOST-1 order roundrobin state enabled % set addressContext default dnsGroup DNG-1 server SERVER1 ipAddress 1.1.1.1 priority 1 recursionDesired true weight 10 % set addressContext default zone ZONE_AS dnsGroup DNG-1

    

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DNSGroup_Limit DNSGroup_Limit

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DNSGroup_delete_rule DNSGroup_delete_rule

Configure DNS A/SRV and NAPTR Queries

The 

Spacevars
0 product

supports DNS A/SRV and NAPTR Queries. The DNS Group and DNS support type configuration is required in the 

Spacevars
0 product

to trigger the DNS Queries to the DNS Server.

Perform the following steps to configure the DNS server for DNS A/SRV and NAPTR queries:

1. Create a DNS group and add a DNS server in the group.

   Tip
   More than one DNS server can be added. Each is selected based on its weight and the priority.

   Code Block
   language none
   % set addressContext a1 dnsGroup <dnsgroupname> server <servername> ipAddress <DNS ipaddress> state enabled

    
    

2. In the SIP Trunk Group services, create a Static route for the DNS Server.

   Code Block
   language none
   % set addressContext a1 zone <zone_name> sipTrunkGroup <trunkgrp name> services dnsSupportType a-srv-naptr % set addressContext a1 staticRoute <dns ip address> <prefix> <gateway ip> <Intfce> <if_ethx> preference 10

    
    
   

3. In the IP Signaling Profile, enable the "noPortNumber5060" flag. 

   Code Block
   language none
   % set profiles signaling ipSignalingProfile <SIP IP signaling profile name> commonIpAttributes flags noPortNumber5060 enable

    
   
   

4. Ensure that IP Peer returns the domain name so the SBC can send the query to the DNS Server. 

   Code Block
   language none
   % set addressContext a1 zone <dnsgroupname> ipPeer <peer name> policy sip fqdn <Domain name> fqdnPort <port>

    

   Note
   For NAPTR/SRV lookups, ensure the port number is not configured under IP Peer on the SBC, or IP Signaling Peer Group in the PSX, if external PSX is used. If only A-record lookups are required, the port must be configured.

   
   
   

5. Check the DNS server status and statistics:

   Code Block
   language none
   % show table/status addressContext a1 dnsGroup DNSGroup1 dnsServerStatistics % show table/status addressContext a1 dnsGroup DNSGroup1 dnsEntryStatus % show table/status addressContext a1 dnsGroup DNSGroup1 dnsEntryDataStatus

 

Info
Refer to the following pages for  command syntax details: EMA: DNS - DNS Group, Address Context - DNS Group CLI: Zone - DNS Group - CLI, DNS Group - CLI

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