Download dns firewall

--> DNS Firewall is a type of firewall which is used to block/prevent Client DNS Queries to Malicious Domains/IP Addresses.--> DNS Firewall uses DNS Response Policy zones and threat feeds to prevent most of the attacks.--> Domain Name Service Response Policy Zones is an another name for the DNS Firewall.--> DNS Firewall can do following things:i) Redirecting the queries of malicious domains to a Particular IP address from that we can get to know how many clients accessed the IP address using analytics or insights.ii) Can block the Malicious IP Subnets/Hostnames when the DNS query for the Malicious IP Subnet/Hostname comes on the DNS Firewall.iii) Blocking the DNS Server IP addresses which host malicious domains.--> All the above can be done by configuring Response Policy Zone on the DNS Firewall.--> DNS Response Policy Zone contains multiple DNS rules with the action associated with it.--> Each and every rule in the DNS Response Policy Zone can be configured based upon following requirements:1) DNS Query ( We can block the DNS Query coming as soon as it is coming from the Client)2) DNS Response ( We can block the DNS Response if it contains malicious IP address or domain in the response)3) Name Server IP address ( If any Name Server hosting the malicious domains or IP address we can block it)--> The action can be one of the following if the DNS rule matches:1) Send Non-Existent Domain Response2) Send No Data Records Response3) Change the IP address/FQDN in the DNS Response before sending to the client.4) Allow DNS Response--> DNS Firewall also uses threat feeds to get to know the malicious domains present on the Internet.--> Some of the DNS Firewall vendors provide inbuilt threat feeds and provides the option to integrate with third party threat feed vendors.--> Placement of the DNS Firewall in the network is the most important criteria to protect most of the attacks.--> DNS Firewalls mostly implemented on the Internet Edge so that DNS Queries/Responses can be validated before sending it to other Firewalls.--> Vendors such as F5, Infoblox, Cisco, BlueCat and others provides DNS Firewall functionality.Reference: F5.com/Cisco.com/kb.isc.org/Md.Kareemoddin,CCIE # 54759

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A DNS firewall is a network security solution that blocks users and systems from accessing malicious websites. As part of the DNS system, it checks every accessed IP address to determine whether it has been classified as dangerous. Depending on the check results, the webpage is either displayed or not.How does the DNS firewall work?A DNS firewall filters the traffic that moves through DNS endpoint services. Each DNS request is screened against a denylist, including various dangerous IP addresses, hosts, or websites. The web request is denied if an address or host is found on the denylist.DNS firewalls need to be continuously updated with the latest DNS threat data for this solution to be effective. As malicious domains are constantly taken down and set up, a DNS firewall must keep up with the changes by updating threat intelligence.Some DNS firewalls are expanded with AI capabilities capable of learning and recognizing malicious websites in real time. The bottom line is that a DNS firewall is as secure as an up-to-date or smart denylist is.Benefits of DNS firewallTraditional firewalls use complex and proprietary technologies yet can fail at detecting various DNS-based threats. Which is why DNS firewalls are an important subset of DNS security. Here are the principal benefits that they're bringing to organizations.Highly customizableMalicious URL redirects can serve as educational materials by informing users what they have just avoided. Additionally, not only malicious websites can be blocked with DNS firewalls - this applies to all websites. Social media or streaming media

Speed up and protect entire authoritative nameservers Enterprise-only paid add-on Cloudflare DNS Firewall proxies all DNS queries to your nameservers through Cloudflare’s global network. This action protects upstream nameservers from DDoS attacks and reduces load by caching DNS responses.DNS Firewall is for customers who need to speed up and protect entire authoritative nameservers. If you need to speed up and protect individual zones, refer to Cloudflare DNS Setups.How DNS Firewall worksWhen a DNS query for your domain takes place:Queries go to the Cloudflare data center that is closest to the website visitor. This is determined by the location of the DNS resolver.Cloudflare tries to return a DNS response from cache.If the response is not available in cache, Cloudflare queries the upstream authoritative nameservers.After returning the response from the nameservers, Cloudflare temporarily caches it for subsequent DNS queries.BenefitsDNS Firewall provides the following benefits while allowing your organization total control over your authoritative nameservers:DDoS mitigationHigh availabilityGlobal distributionEnhanced performanceBandwidth savingsRate limiting per data centerMinimum and maximum cache TTL specificationDNS ANY ↗ query type block

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