![]() ![]() To configure DNS Split-Brain Deployment by using DNS Policy, you must use the following steps. How to Configure DNS Split-Brain Deployment So, in our example, the DNS queries for that are received on the private IP (10.0.0.56) receive a DNS response that contains an internal IP address and the DNS queries that are received on the public network interface receive a DNS response that contains the public IP address in the default zone scope (this is the same as normal query resolution). If the server interface upon which the query is received matches any of the policies, the associated zone scope is used to respond to the query. The server Interface is used in this example as the criteria to differentiate between the internal and external clients. When the DNS server is configured with the required DNS policies, each name resolution request is evaluated against the policies on the DNS server. The following illustration depicts this scenario. Using DNS policies these zones can now be hosted on the same DNS server. In the absence of DNS policy, the administrator is required to host these two zones on separate Windows Server DNS servers and manage them separately. The second version is the public version of the same site, which is available at the public IP address 65.55.39.10. This internal site is available at the local IP address 10.0.0.39. This example uses one fictional company, Contoso, which maintains a career Web site at The site has two versions, one for the internal users where internal job postings are available. How to Configure DNS Split-Brain Deployment.This section contains the following topics. Example of DNS Selective Recursion Controlįollowing is an example of how you can use DNS policy to accomplish the previously described scenario of split-brain DNS.This topic contains the following sections. In some circumstances, the Enterprise DNS servers are expected to perform recursive resolution over the Internet for the internal users, while they also must act as authoritative name servers for external users, and block recursion for them. If only a few records inside the zone were split-brained or both instances of the zone (internal and external) were delegated to the same parent domain, this became a management conundrum.Īnother configuration scenario for split-brain deployment is Selective Recursion Control for DNS name resolution. Previously, this scenario required that DNS administrators maintain two different DNS servers, each providing services to each set of users, internal and external. When you use the WARP client together with cloudflared Tunnels or third-party VPNs, Cloudflare evaluates each request and routes it according to the following traffic flow.For information on how to use DNS Policy for split-brain DNS deployment with Active Directory integrated DNS Zones, see Use DNS Policy for Split-Brain DNS in Active Directory. ![]() How the WARP client handles DNS requests Traffic excluded from WARP by Split Tunnel configuration will not be encrypted, managed or monitored by Cloudflare Gateway. Use this mode when you only want specific traffic processed by Gateway, such as when using Tunnels for a specific resource. Any traffic that is not included by IP address or domains defined in the Split Tunnel Include configuration will be ignored by the WARP client and handled by the local machine. Use the Split Tunnels Include mode mode to instruct the WARP client to only handle traffic to a specified set of IP addresses or domains. Use this mode when you want the majority of your traffic encrypted and processed by Gateway, but need to exclude certain routes due to app compatibility, or if you need WARP to run alongside a VPN. Any traffic that is destined to an IP address or domain defined in the Split Tunnels Exclude configuration will be ignored by the WARP client and handled by the local machine. Use the Split Tunnels Exclude mode to instruct the WARP client to ignore traffic to a specified set of IP addresses or domains. DNS requests to domain names entered here will not be encrypted, monitored or subject to DNS policies by Cloudflare Gateway. This is useful when you have private hostnames that would not otherwise resolve on the public Internet. ![]() Use Local Domain Fallback to instruct the WARP client to proxy DNS requests for a specified domain to a resolver that is not Cloudflare Gateway.There are three settings you can configure: However, under certain circumstances, you may need to exclude specific DNS requests or network traffic from WARP. When the WARP client is deployed on a device, Cloudflare processes all DNS requests and network traffic by default. ![]()
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