Disaster Recovery Mode
Interface
Domain Addition Form
A new domain name is added to the TR7 ASP device by clicking the "Add" button.
- Domain Name
Enter the name of the domain to be created.
- Default Mode
- Disaster Recovery
This mode is used when two data centers operate in an Active-Passive redundant structure via DNS service provided by TR7 GTM. In DRC (Disaster Recovery Center) mode, two data centers are designated as the main and backup. Matching configurations are applied to the TR7 devices at both data centers. Then, a domain (zone) is created on the relevant DNS service, and DNS records are added. Using this mode, comprehensive scenarios can be created for DNS records on TR7 GTM for both the main and backup data centers. While defining disaster recovery scenarios, various conditions are evaluated, such as internet access of TR7 devices in the data centers, bandwidth, CPU usage, RAM usage, service status, and whether they are in maintenance mode. Based on these conditions, DNS scenarios are defined.
- Main DC
Specifies which TR7 device will act as the Main DC for the created domain.
- DR DC
Specifies which TR7 device will act as the Disaster Recovery DC for the created domain.
- EXPRESS
Indicates that the created domain will operate in "Express" mode. When defining the DNS service in this mode, enabling the Express feature allows a profile to be defined. In this profile, the master DNS server information from which the TR7 DNS service will retrieve records via Zone Transfer is entered. To enable this operation, the master DNS server (DC, PowerDNS, Bind, etc.) must allow Zone Transfer to the TR7 DNS service address. In Express mode, TR7 GTM retrieves the relevant records from the existing DNS server, and these records are managed through that server. Any additions, deletions, or modifications to DNS records are made on the master DNS server, and TR7 GTM reflects these changes in real time. For more details about Express Profiles, click here.
- Slave Server IPs
Slave DNS servers can be added for the created domain. By adding slave servers, Zone Transfer permission is granted from the TR7 GTM for the respective domain.
- DNSSEC
TR7 GTM supports the DNSSEC feature for each created domain. DNSSEC (Domain Name System Security Extensions) is a security protocol developed to make DNS (Domain Name System) more secure. Since security was not a major concern during the original design of DNS, attackers can exploit DNS for various attacks. DNSSEC was developed to close these vulnerabilities and ensure users can browse the internet more securely.
- Meta Data
Allows adding meta variables and values to DNS queries for the added domain.
- SOA Format
It is possible to set an automatically working SOA format for each domain created on TR7 GTM. - YYYYMMDD01 Format - Increase by 1 - Current UNIXTIME - Off
Interface
DNS Record Addition Form
A new DNS record is added to the TR7 ASP device by clicking the "Add" button. To manually add a DNS record, the respective domain must not be operating in Express mode.
- Record Name
Enter the name of the DNS record to be created.
- Record Type
Select the type of DNS record.
- TTL
Specify the TTL value to set the cache duration for the record. A shorter TTL is recommended for redundancy and business continuity.
- Record Behavior
Automatically set based on the selected "Default Mode" of the previously created domain. For more information, please refer to the "Domain Addition Form" above.
- Topological Selection
When enabled, "Topology" selection can be used for the DNS record to be added.
- Always: The record that is always active among the topological selections, and the DNS response is returned regardless of any other information.
- Network: Determines the DNS response based on IP and subnet information entered in the Network List.
- Country: Determines the DNS response based on the country information from DNS queries.
- Continent: Determines the DNS response based on the continent information from DNS queries.
- ASN: Determines the DNS response for the record based on Autonomous System Numbers and IP groupings.
- Main DC
Configurations for DNS records are set for the previously defined Main data center.
- Record
This is the field where the appropriate address is entered based on the record type for the given "Record Name". For example, for an "A" type DNS record, an entry like 83.11.173.211 can be made.
- HC
Determines which address will be returned for each record entry based on health check results, the topological selection explained above, and defined health scenarios. More information can be found in Health Checks and Health Scenarios.
- Static: The record is always considered healthy and responds to queries regardless of any health scenario.
- Disabled: The record is always considered unhealthy and never responds to queries under any condition.
- HC Scenario: Returns a healthy record according to the defined health scenarios. For more information, click here. This is where the condition for a record to be considered unhealthy is defined.
- DR DC
Configurations for DNS records are set for the previously defined Disaster Recovery (DR) data center.
- Record
This is the field where the appropriate address is entered based on the record type for the given "Record Name". For example, for an "A" type DNS record, an entry like 83.11.173.211 can be made.
- HC
Determines which address will be returned for each record entry based on health check results, the topological selection explained above, and defined health scenarios. More information can be found in Health Checks and Health Scenarios.
- Static: The record is always considered healthy and responds to queries regardless of any health scenario.
- Disabled: The record is always considered unhealthy and never responds to queries under any condition.
- HC Scenario: Returns a healthy record according to the defined health scenarios. For more information, click here.
- Disaster Recovery Condition
Defines the condition under which DNS records will switch to disaster recovery mode.
- Automatic (When no healthy primary records left): DR switch occurs automatically when there are no healthy primary records. No scenario definition is required.
- Always: DR mode will always be active. In this case, DNS responses will always return the DR records.
- Never: DR mode will never be activated. DNS responses will always return the Main DC records.
- Scenario: Switch to disaster mode based on defined Health Scenarios.
- Balance Algorithm
Specifies which algorithm will be used when responding to DNS queries.
- All Records: Returns all record addresses in a single response. If DR is not triggered, returns all healthy Main DC records; otherwise, returns all healthy DR DC records.
- First Healthy Record: Returns the first healthy record in response to DNS queries.
- First 2 Healthy Record: Returns the first two healthy records.
- First 3 Healthy Record: Returns the first three healthy records.
- Round Robin: Returns responses using Round Robin algorithm from healthy records.
- Weighted Round Robin: Returns responses using Weighted Round Robin algorithm. Weight must be specified for each record.
- Random: Returns a random healthy record.
- Weighted Random: Returns a random healthy record based on assigned weights.
- Geographic Proximity: Returns the geographically closest healthy record in response to DNS queries.
- Fail-Safe Records
Specifies which response will be returned when all records in both the Main and DR data centers are unhealthy.
- Add
Click the Add button to add the DNS record.
Interface
Adding and Editing DNS Records in Express Mode
If the "Express" option is enabled while creating the domain, DNS records for that domain are retrieved from the master DNS server. For more information, see Express Profiles and Domains.
- Sync via Express
Since all DNS records are retrieved from the master DNS server when the Express feature is enabled, records cannot be added manually. To fetch records from the master DNS server, click the "Sync via Express" button and retrieve the current records via Zone Transfer.
- Editing DNS Records
For DNS records retrieved via Zone Transfer, record type and name are not entered manually—they are imported exactly as they are on the master DNS server. Additionally, record fields such as Record Name or Record cannot be edited through the UI.
