Datacenter Mode

- Domain Name

The name of the domain to be created is entered.

- Default Mode

- Datacenter

A mode used by organizations with more than two data centers. With Datacenter mode, TR7 devices located in each data center can operate in Active-Active or Active-Passive modes.

- DC No

Previously defined datacenters can be added on this screen by clicking the "+" button.

- EXPRESS

Specifies that the domain to be created will run in "Express" mode. In this mode, an Express profile is defined by enabling the Express feature during DNS service creation. This profile includes the master DNS server information from which the TR7 DNS Service will receive records via Zone Transfer. For this to work, the TR7 DNS service address must be allowed to perform Zone Transfer on the master DNS server (DC, PowerDNS, Bind, etc.). With Express mode, TR7 GTM will fetch records from the existing DNS server, and the records will be managed through that DNS server. Any changes such as adding, removing, or modifying DNS records are handled on the DNS server, and TR7 GTM will instantly synchronize those changes. For more details on Express Profiles, click here.

- Slave Server IPs

Slave DNS servers for the domain can be added. By adding slave DNS servers, Zone Transfers are allowed from TR7 GTM for the respective domain.

- DNSSEC

TR7 GTM supports DNSSEC for each created domain. DNSSEC (Domain Name System Security Extensions) is a security protocol that enhances the security of the DNS (Domain Name System). DNS was not originally designed with security in mind, making it susceptible to various attacks. DNSSEC was developed to address these vulnerabilities and ensure a safer browsing experience.

- Meta Data

Allows the addition of meta variables and values to DNS queries for the added domain.

- SOA Format

It is possible to configure an automatic SOA format for each domain created on TR7 GTM. - YYYYMMDD01 Format - Increase by 1 - Current UNIXTIME - Off

- Record Name

The name of the DNS record to be created is entered.

- Record Type

The type of DNS record is selected.

- TTL

TTL value is specified to set the cache time for the record. For redundancy and business continuity, it is recommended to keep the TTL short.

- Record Behavior

This field is auto-filled based on the "Default Mode" selected for the associated domain. For more information, refer to the "Add Domain Form" section above.

- Topological Selection

When enabled, allows topology-based selection for the DNS record.

• Always: Always active and responds to DNS queries regardless of other criteria.
• Network: Based on IP and Subnet info entered into the Network List.
• Country: Responds based on the country info in DNS queries.
• Continent: Responds based on the continent info in DNS queries.
• ASN: Responds based on Autonomous System Number groupings.

- DC No

Configurations for the corresponding DNS record in previously defined datacenters are performed here. All datacenters selected during domain addition are listed and each can be individually configured.

- DR DC

Configuration of DNS records for the previously defined Disaster Recovery (DR) datacenter is done here.

- DC Selection

Selects which Datacenter will respond to DNS queries.

• All DC Records: All records from all datacenters are eligible to respond. No additional criteria needed. DNS queries will be answered from the number of datacenters specified in the "Total DCs to select from" field, based on health checks.
• DC Based: Responses are given based on selected Datacenter(s). Selection is made based on the "Selection Criterion", which includes:
  • CPU: Datacenter(s) with the lowest CPU usage.
  • Memory: Datacenter(s) with the lowest RAM usage.
  • Bandwidth: Datacenter(s) with the lowest bandwidth usage.
  • Status: Healthy datacenter(s) based on their overall status.
  • Packet Loss: Datacenter(s) with the least packet loss.
• Service Based: Responses are based on vService metrics and selected criteria:
  • CPU, Memory, Bandwidth, Request, Connection, Session, Status, Healthy Backends: Metrics are evaluated across datacenters where the named vService exists.
• Client Based: DNS queries are responded based on client-side metrics:
  • Number of Hops: Datacenter(s) with the least hops from the client.
  • MOS: Datacenter(s) with the highest network performance.
  • Packet Loss: Datacenter(s) with the least packet loss to the client.
  • TTL: Datacenter(s) with the lowest TTL value from the client.

- Total DCs To Select From

Based on the selected option in DC Selection, defines how many datacenters will respond in a single DNS query.

- Balance Algorithm

Specifies which algorithm to use when responding to DNS queries.

• All Records: Returns all healthy records at once. If disaster recovery is not configured, returns all records from the Main DC; otherwise, returns all from the DR DC.
• First Healthy Record: Returns the first healthy record.
• First 2 Healthy Record: Returns the first two healthy records.
• First 3 Healthy Record: Returns the first three healthy records.
• Round Robin: Returns answers using Round Robin among healthy records.
• Weighted Round Robin: Returns answers using Weighted Round Robin; weights must be assigned.
• Random: Randomly returns a healthy record.
• Weighted Random: Randomly returns a weighted healthy record.
• Geographic Proximity: Returns the geographically closest healthy record.

- Fail-Safe Records

Defines what response will be given when all records in both Main and DR Datacenters are unhealthy.

- Add

Adds the DNS record by clicking the Add button.

- Sync via Express

Since each DNS record is fetched from the master DNS server while Express mode is active, manual record addition is not possible. Click the "Sync via Express" button to retrieve existing records via Zone Transfer.

- Editing DNS Records

Records retrieved via Zone Transfer are taken directly from the master DNS server and cannot be edited in terms of Record Name, Record Type, etc.