GSLB according to the DNS protocol is considered to be quick and reliable. Responses are almost real-time – an ideal option for applications that require high data center availability for disaster recovery.

As companies GSLB, they still face the challenge of quickly and reliably delivering applications to multiple locations while ensuring latency in DNS resolution, so it is advisable to use load balancing at the network level – including “Edge DNS-GSLB” called.

The digital infrastructure does hard work every day. It provides the responsiveness and availability that business applications rely on that are located in a wide variety of data centers (on-premises, in private or public clouds) and that are accessed from worldwide locations. The Gartner analysts study “Why Organizations Choose a Multicloud Strategy” found that 81 percent of respondents are currently working with two or more cloud providers. This means: Modern IT teams have to guarantee reliability more than ever in an ever-growing multi-cloud environment to keep business-relevant workflows going.

Smart Applications Require Load Balancing At The Edge

Load balancers and application delivery controllers (ADCs) are now well-known tools for balancing server loads. While ADCs distribute traffic within a single data center, the strength of the Global Server Load Balancer (GSLB) is that workloads are distributed across multiple data centers or locations.

Global server load balancers, which are integrated into recursive DNS servers and are used at the edge of the network, ie “at the edge” (Edge DNS GSLB), take this approach to a new and more sophisticated level. Benefits include simplified deployment, improved user experience, more robust applications, and, what may be very important for some companies, optimized disaster recovery plans (DRP).

This means that they are more fully and better prepared for potential system failures and can, therefore act more relaxed. The combination of DNS and GSLB functionality on one server significantly reduces capital expenditure and operating costs and simplifies the rollout in the entire company infrastructure.

The Benefits Of Global Load Sharing

By implementing GSLB in recursive DNS servers, traffic routing decisions for applications can be made geographically closer to the user and thus enable native localization. Since GSLB can be used at remote locations, the reliability is additionally strengthened. At the same time, the possibility of error detection on data center, WAN, server, and GSLB failures improves.

Large system failures at well-known companies repeatedly make it into the global media, as they can bring about numerous negative side effects such as damage to image and loss of sales. Incidents such as Google’s November 2019 cloud outage are rare but show that even the largest players in this area are not invulnerable.

DNS-based edge GSLBs can significantly minimize the impact of such an interruption since business-relevant data traffic can be seamlessly routed to a previously defined and configured backup data center at another location. Also, by adding IP Address Management ( IPAM ) capabilities, companies can manage both their cloud and on-premises applications from a central repository. For network administrators, GSLB facilitates system recovery at the network level in all three central steps of disaster recovery, preparation, testing, and activation.

1.Stress-Free Preparation

Changing the configuration of DNS records for multiple applications can turn out to be a confusing and complicated matter that also involves various sources of error. Edge DNS GSLB provides support here; because the technology approach can be used to prepare the respective failure scenario and, in a next step, simplify activation.

Global server load balancing at the network level, which is linked to an application repository, enables preparation at the server level, which is used in the event of a system failure. Administrators can plan and work out the priority defined in the Business Impact Analysis (BIA) for the changeover of each application without any stress.

2.Simplified Testing With Minimal Impact On Network And User

By relying on DNS to prepare for a system failure, IT teams prevent the entire network from being disrupted when testing their disaster recovery plans. You can easily test a DRP scenario at a pilot site and apply your recovery strategy on only one Edge DNS GSLB server without affecting other sites. This means that you can substantiate that your approach is robust and reliable and that user access to applications will not be affected.

3.Automated And Error-Free Switchover Activation

With just one click and using the Edge DNS GSLB approach, the configuration defined in the preparation phase can be implemented in an emergency. During the disaster recovery phase, the DNS configuration on all servers is automatically changed by switching the management status of the nodes per application priority. The application traffic is also routed to the services located in the backup data center.

Also Read: Ensuring Data Integrity Through Blockchain Based Audits

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What Is Reverse DNS

The DNS query that determines the IP address from a given domain or hostname is called Reverse DNS (rDNS) or Reverse DNS lookup. The requirement is that there is a so-called PTR (“pointer”) record linked to the name and that it allows this type of “reverse” search in the domain name system. Those responsible for organizing these entries, which are located in their namespace (domain), are various Internet providers. Modifications to this pointer are only possible after consultation with the provider.

When And For Who Is A Reverse DNS Lookup Useful

Like the standard search process, Reverse DNS provides not only the resolution of the name or IP address but also some additional information. In this way, in addition to the desired hostname, with a Lookup, you also obtain a geographical allocation of the IP and information about the responsible Internet service provider. This information is not particularly valuable for the analysis of private users since the real names generated automatically and linked to the IP addresses do not allow the personal identification that would be relevant for marketing purposes. However, user location data can be very profitable, since it allows conclusions to be drawn about the target markets they are targeting.

The information in Reverse DNS lookups is especially useful for B2B marketing: most companies have their IP address, so in many cases, it is possible to easily reconstruct when a particular company is using its website.

How Does Reverse DNS (rDNS) Work Exactly

Having a Reverse DNS lookup look up the IP address of a device or Internet server in the entire domain name system would be time-consuming. For reverse DNS lookups, a domain with three subdomains has been configured with in-addr.arpa (for IPv4 addresses) or ip6.arpa (for IPv6 addresses), allowing the resolution of the address in a maximum of three steps. The subdomains have the following structure:

• RDNS 1 Subdomain: The subdomain immediately after in-addr.arpa or ip6.arpa represents the first component of the IP address.
• RDNS 2 Subdomain: Level 2 contains the second component of the IP address.
• RDNS 3 Subdomain: rDNS subdomain 3 contains the third component of the corresponding IP address.

The individual components of the IP address are arranged to the left of the main domain in reverse or analog order to their proximity.

Reverse DNS Lookup Explained In Concrete Examples

The simplest way to illustrate how Reverse DNS domains work is a short example search. Thus, the search for the IPv4 address 217.160.0.128 should look like this:

128.0.160.217.in-addr.arpa
When this search is started with a Reverse DNS lookup tool, the following result is obtained:

The hostname for 217.160.86.40 is 217-160-0-128.elastic-ssl.ui-r.com.
The domain is shown ( elastic-ssl.ui-r.com ) is operated by IONOS: specifically, it is a test website that is hosted on IONOS servers. This information can be provided by numerous Lookup tools.

The web project can also be accessed through the IPv6 address 2001: 8d8: 100f: f000 :: 2e3, for which the rDNS Lookup would look like the following:

3.e.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.f.0.0.1.8.d.8.0.1.0.0.2.ip6.arpa

Reverse DNS: The Best Tools For Reverse DNS Lookup

With nslookup, most Linux, Windows, and macOS systems already have a tool that allows you to perform any search in the domain name system. With this program, it is possible to carry out both standard DNS searches and Reverse DNS lookups, in which the local DNS server specified by the provider is contacted in a standard way. If necessary it is also possible to define another server name.

Alternatively, address searches can also be performed with rDNS via the web. There is a wide variety of lookup-based online tools that allow individual DNS server searches to be performed directly in the browser. Among them are the following three solutions:

• MxToolBox: MxToolBox is a web service that offers different network diagnostic tools and Lookup. Although some of these offers are paid, the Reverse DNS check with SuperTool is always free. To use it, just select the “Reverse Lookup” option and type in the IPv4 or IPv6 address.
• WhatIsMyIP.com: Unlike what the website name implies, at WhatIsMyIP.com it is not only possible to check what the IP address is, but also to perform rDNS searches. To do this, select the “Reverse DNS Lookup” item, enter the IPv4 or IPv6 address in the entry line and click on “Lookup”.
• Debouncer: The Debouncer web service is specifically designed to check whether the domain itself or the mail server used regularly is on a spam blacklist. Through the “Reverse DNS check” option it is also possible to perform reverse DNS searches, although it is only possible to check IPv4 addresses.

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