Split dns security

Split dns security. I have found this is a bug CSCuz22961 Any suggestions if I require to add more domains in the split-dns value in th Nov 14, 2016 · Open up a terminal and perform a tcpdump on tun0 as root: # tcpdump -i tun0 udp port 53. May 15, 2023 · The DNS proxy feature provides a transparent mechanism that allows devices to proxy hostname resolution requests on behalf of clients. Select the router to configure on the DEVICES page. Filtering. With split-brain DNS, DNS records are split into different Zone Scopes on the same DNS server, and DNS clients receive a response based on whether the clients are internal or external clients. Enable the option Enable DNS Sinkhole Service. Zscaler DNS Security and Control services offer mechanisms to take control of your DNS architecture and response. 27, the IP address assigned via DHCP to your local printer. Other traffic e. Active Directory integration provides multi-master high 0. org and is being used to map to an on premise service that the users must access remotely. Feb 5, 2019 · You just need to do split-tunneling then on the MX. In my record I add test. Click Download VPN client. streaming, social madia etc. Click Accept. Jul 29, 2021 · How to Configure DNS Split-Brain Deployment. Jul 1, 2014 · A caching DNS server has the following properties: Access to the entire range of public DNS data. To make sure Split-DNS is working properly, review the Environment Backup – The 7 Resolve-DnsName commands at the end. END New DNS security standards have created new opportunities to make Split-Horizon DNS more secure and compatible. Click Point-to-Site configuration. For example, a DNS query for the host www. Split DNS directs internal hosts to an internal domain name server for name resolution and external hosts are directed to an external domain name server for name resolution. Hugh, a security consultant, recommended the use of an internal and external DNS to provide an extra layer of security. Split tunneling is a VPN feature that divides your internet traffic and sends some of it through an encrypted virtual private network (VPN) tunnel, but routes the rest through a separate tunnel on the open network. Then open up yet another terminal and perform a DNS lookup for a domain on the Internet like yahoo. The other DNS server directs internal clients to an internal server. The public fqdn is test. In SecuRemote, you can do this with the split DNS feature. Security software such as a network firewall or adware and spyware removal programs may attempt to block ETP Client . This is known as “split DNS”. com" to Split Tunnel -> Domain and Application -> Exclude Domain and setting App -> Split-Tunnel Option to "Both Network Traffic and DNS" enabled the function. Solved! Go to Solution. 47. The bug was initially About DNS Sinkholes. Both of the DNS name server components reside in a Cisco device running the Cisco IOS DNS subsystem software. ) Associate one or more Amazon VPCs with the private hosted zone. Under the Split DNS table, click +Add. It knows about the root DNS servers and can intelligently follow referrals as it receives data. In the Domain Name field, enter the domain name. In a split DNS infrastructure, you create two zones for the same domain, one to be used by the internal network, the other used by the external network. The goal of split DNS, as opposed to a single DNS, is to increase security and privacy by not inadvertently exposing sensitive information in a DNS record from the Oct 2, 2022 · Description. Split DNS - The DNS queries which matches the domain names, are configured on the Cisco Adaptive Security Appliance (ASA). Static routing. While this approach works great for most Jan 31, 2019 · You just need to do split-tunneling then on the MX. Under the General tab, enter up to two internal DNS servers to be passed down to the client. The myfqdn. All other DNS queries go to the DNS resolver on the client operating system, in the clear, for DNS resolution. Apr 20, 2022 · Step 1: Establish the split-brain DNS zone in internal DNS. 4) Go to DNS Database and select 'New': Configure DNS Zone and Domain Name. Improve this answer. Information on the Zscaler service's DNS Control. ttm configuration file to set if Split DNS is enabled, disabled, or depends on the Remote Access client settings. I am configuring a split-tunnel, when I add another domain to the split-dns value I am receiving this error: ERROR: % Input should be less than 256 characters. 2) Only local domain requests will be forwarded to the local DNS Server, while all other domains will be forwarded through the ISP DNS server. VPN clients receive one IP address for a given DNS query, while all other clients receive a different IP address. If you selected DNS Proxy, a page for it, DNS Proxy, also displays on the Add Split DNS dialog. tunnel specific networks *and* specific DNS traffic. Select the client and fill out any information that is requested. 16, while for printer it might return 192. Scroll to the Split DNS section. Oct 7, 2014 · DNSSEC is a set of security extensions to DNS that provides the means for authenticating DNS records. Separate DNS namespaces are administered for external computers and internal ones. One is internal and one is external, with authoritative zones for the corpnet. Split DNS directs internal hosts to an internal domain name server for name resolution and external hosts are directed to an external domain name DNS refers to your domain name server, which ensures that users can connect to the right IP address when they type in a URL, such as Google. A vulnerability in the Split DNS feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. Feb 1, 2019 · You just need to do split-tunneling then on the MX. Remove all the root DNS server entries on the Root Hints tab. 168. CloudFlare is planning to introduce DNSSEC in the next six months, and has brought Olafur Gudmundsson, one of the inventors of DNSSEC, on board to help lead the project. The proxy can redirect the DNS queries selectively to specific DNS servers, according to partial or complete domain Dec 14, 2023 · The Split DNS functionality allows you to reach internal domain names while connected to the VPN, in the case when both External/Custom DNS and Split Routing features are activated on a UTunnel Access Gateway/VPN server. vpn-tunnel-protocol IPSec . dns-server value 192. There are two flavors of domains attached to a network interface: routing domains and search domains. 0 by Eric Fischer. Do read the security warning at Wireguard-Windows' admin-registry. Unlike the VPN tunnel, this second tunnel is not encrypted and it has no protections whatsoever. This article explores several design Nov 14, 2007 · I set up split DNS to force the clients to lookup the internal domains with the nameserver on our network. This guide also covers DNS security features such as DNS filter, DNS translation, and DNS safe search. This provides easier and faster resolution for clients and prohibits an external DNS server from initiating communications with your internal DNS. Private DNS — resides behind a company firewall and maintains records of internal websites. Online traffic passing through the unencrypted tunnel interacts with the internet directly and enjoys no online privacy. So, in essence, you have a DNS architecture “split” between internal and external nameservers. Both of the DNS name server components reside in a Cisco router running the Cisco IOS DNS subsystem software. To change the setting for Split DNS on the Security Gateway: 3 days ago · 6. Create the Zone Scopes; Add Records to the Zone Scopes; Create the DNS Policies; The following sections provide detailed configuration instructions. Dec 22, 2016 · The corporate ASA also hosts an SSL VPN for remote clients which is using split-tunneling and split-DNS and this works fine when clients connect from outside of the offices. With NS1, you can achieve multiview or split-horizon DNS by adding the NETFENCE_PREFIX filter to a record, and then associating the IP subnet (s) to which you want a particular answer served as metadata on that answer. A private DNS server has several advantages for a sysadmin: Because a private DNS is only available within a private network, that DNS server can resolve domains that are only valid within the network. Under the Client Config tab, configure split tunneling, the default domain name, and the split DNS domain list. Dec 21, 2023 · When split DNS for split include tunneling is configured in the Network (Client) Access group policy, AnyConnect tunnels specific DNS queries to a VPN DNS server (also configured in the group policy). In this implementation, whenever a user sends a request for an administrative network resource and makes the request from the same network, the internal DNS May 24, 2021 · split DNS. 2. This scenario is shown below. com " starts immediately. Enter the primary DNS server and secondary DNS server that Prisma Access should use to resolve the internal domain names. This signing process is similar to someone signing a legal document Dec 23, 2020 · Adding "*. < Previous Section Next Section >. Navigate to Manage |System Setup | N network | DNS Security. 5) Go to DNS Entries and select 'New': 6) Select 'OK': 7) Go to SSL-VPN Portals, select the respective portal and enable DNS Split Tunneling: 8) Go to Split DNS, select 'New' and enter the domains and FortiGate port3 interface IP: 9) Create a firewall policy to allow Apr 26, 2023 · Lastly, you need Azure to automatically register VMs into the DNS zone. Click the Configuration drop-down menu, and then click Edit. Unlike DNSSEC, which involves a specific method, protocol, or extension, DNS security is a concept. CC BY 2. In a split DNS infrastructure, you create two zones for the same domain, one to be used by the internal network, the other used by the external network typically users on the Internet. acme. The means of accommodating this will vary depending on the specifics of an organization’s DNS infrastructure, but the end result is the same. net might return a public IP address result for a host on the internet and a private IP address for hosts on the organization’s internal Jan 18, 2023 · in the AAAA records for internal hosts. DHCP servers and relays. DNS sinkholes are effective at detecting and blocking malicious traffic, and used to combat bots and other unwanted traffic. split-tunnel-policy tunnelspecified. io it returns 31. Oct 3, 2023 · The Split Domain Name System (Split DNS) is a technique that allows a local network to use different DNS servers for different services. In the left navigation pane, expand DNS, expand the server name, and then select Forward Lookup Zones. zip file. The protocol provides cryptographic authentication of data, authenticated denial of existence, and data Nov 30, 2022 · However, many organizations may view the external queries of their Active Directory DNS servers as a security risk. To get the best learning experience from this module, you should have knowledge and experience of: AD DS concepts and technologies. Get-ItemProperty -Path HKLM:\SOFTWARE\Wireguard. When enabled, Content Gateway can use multiple DNS servers, depending on your security requirements. In the Default Domain field, enter the default domain for split DNS requests. com and example. Define granular DNS filtering rules using a number of DNS conditions, such as users, groups, or Enable the checkbox for IPv4 Split DNS which states Enable proxying of split DNS servers. This article describes how to implement split DNS for Local and Global domain. To enable the proxying of split DNS servers. For example, you can configure the proxy to look to one set of DNS servers to resolve hostnames on your internal network, while allowing DNS servers outside the firewall to resolve hosts on the Internet. Basic security best practices. Feb 15, 2024 · ExpressVPN has temporarily suspended use of its split-tunneling feature on its Windows app due to a bug that wasn’t properly directing DNS requests to its servers. For corporate VPNs, split tunneling bypasses the DNS, intrusion detection, and threat prevention systems set in place to protect company data. Split-DNS: Generally speaking, split-DNS may be problematic. Install the DNS service on both. Palo Alto Global Protect VPN (macOS) with split-DNS mode active May 18, 2023 · 1) The SSL VPN tunnel will route only the internal network, while all other network traffic including internet traffic will go through the ISP (Internet Service Provider). Sep 8, 2015 · The first step to obtaining a digital certificate is creating a new certificate request in the Exchange admin center on your Exchange 2013/2016 server. Split DNS Config as follows: group-policy VPN attributes. Dec 6, 2022 · This creates a distinction between public and private DNS servers. , for bonfert. Unfortunately the experienced time for the DNS resolution will become much higher. See example below. The Add Split DNS dialog displays. Yes. All zone data served by publicly accessible DNS servers hooked into the global delegation tree can be reached by a caching DNS server. On Endpoint Security VPN and Check Point Mobile for Windows, you can edit a parameter in the trac_client_1. I am using a PIX 501 to 3000 series concentrator. To do this you have to log into EAC and go to servers, certificates. Log into NetCloud Manager. Split-horizon DNS can provide a mechanism for security and privacy management by logical or physical separation of DNS information for network-internal access (within an administrative domain, e. To configure DNS Split-Brain Deployment by using DNS Policy, you must use the following steps. You can use a wildcard (*) in front of the domains in the domain list, for example *. • Host names should comply with RFC 1123. The Domain Name System Security Extensions ( DNSSEC) are a suite of extension specifications by the Internet Engineering Task Force (IETF) for securing data exchanged in the Domain Name System ( DNS) in Internet Protocol ( IP) networks. fqdn. 3. tailwindtraders. Scope. Split DNS uses a SecuRemote DNS Server DNS policies and split views can be beneficial for your DNS infrastructure in terms of performance, security, and availability. For Endpoint Security VPN and Check Point Mobile for Windows, you can do this with Office mode. This configuration is typically used to provide reliable load balancing and redundancy in a network infrastructure. By default, a DNS service is included on all UTunnel servers to avoid DNS leaks. Similar to the way split tunnelling works, it needs both sides to include the feature, and currently, split-DNS is not in the client. You also must consider DNS resolution for PaaS services that use a private endpoint. DNS that you provide that subnet with should be internal DNS only if you want to ensure internal sites resolve. Create public and private hosted zones that have the same name. xyz domain. , company) and access from an unsecure, public network (e. The primary security goals for DNS are data integrity and source authentication, which are needed to ensure the authenticity of domain name information and maintain the integrity of domain name information in transit. Click the card to flip 👆. Jun 30, 2022 · Split DNS refers to a DNS configuration where, for a given hostname, public Internet DNS resolves to public IP address, and DNS on the internal network resolves to the internal, private IP address. A DNS sinkhole — also known as a sinkhole server, Internet sinkhole, or Blackhole DNS — is a DNS server that gives out false information to prevent the use of the domain names it represents. The client must use an internal DNS server to resolve the names of internal hosts (behind the Security Gateway) with non-unique IP addresses. But: If you have an Umbrella subscription (which is anyhow good to have for added security) you can use the Umbrella connector to implement this feature. Infoblox centralizes and automates DNS, enabling you to deliver applications and services with the high availability, security and response times your connected DNS data is meant to be public, preserving the confidentiality of DNS data. Internet traffic goes out local, and traffic destined for 'internal' will go over the VPN. 5 - Enumeration Countermeasures (Practice Questions) Split DNS. the Internet ). accounting. local or *. I am not aware of any similar native feature on the MX. This is a split tunnel scenario. The proxy can use existing DNS cache, which is either statically configured by you or learned dynamically, to respond to the queries directly. Prerequisites. Click the plus button to open a new Exchange certificate request creation wizard. 234. Rename the cache. It is not supported if the 3rd party VPN makes use of the DNS Proxy Provider for split DNS. skype. org is the fqdn that serves our website. Wrapping up. Yes, point it to your public IP. For organizations looking to streamline their network architecture while maintaining separate internal and external services, implementing Split-Horizon DNS with Azure Private DNS Zones is an optimal solution. You can specify your internal corporate network IPv4 and IPv6 address ranges and DNS suffixes, which ETP Client prefers in case a split DNS domain resolves to multiple IP addresses with different DNS resolvers. 1. Typically, split tunneling will let you choose which apps to secure and which can connect normally. DNSSEC protects against attacks by digitally signing data to help ensure its validity. Click Download to generate the . org and the local ip of my on premise server e. Any help is appreciated Dec 12, 2023 · It simplifies domain management, enhances security, and provides a tailored experience to users based on their network location. The . To do this, open Administrative Tools, and then double-click DNS. NOTE: In the DNS Settings section, note the setting in the Mode drop-down list. exclude from tunneling specific networks/domains *and* specific Mar 21, 2019 · Split-Brain or Split-Horizon DNS provides different information about the contents of a DNS zone based on the location that the DNS query originates. It provides different data regarding the contents of a DNS zone based on the location that the DNS query originates. 2. Diagram: Sep 24, 2020 · Summary. Go to the Configure > Networking > DNS Resolver > Split DNS tab. systemd-resolved first picks one or more interfaces which are appropriate for a given name, and then queries one of the name servers attached to that interface. Public DNS — maintains a publicly available domain names list available. You can configure split-brain DNS for Active Directory integrated zones or for zones on standalone DNS servers. It’s a much more discrete DNS configuration method, but the organization must manage it. 21 Jun 4, 2018 · DNS – Always the First Step. Split DNS is a security risk - Umbrella handles this split for you with public DNS routing straight to us instead of internal DNS. To do this, follow these steps on the on-premises DNS server: Open the DNS Management Console. Enabling DNS Sinkhole and configuring it . The split-brain DNS deployment using DNS policy is an interesting capability found in Windows Server 2016 and higher. This People just prefer split-horizon mostly for security reasons (no need to disclose anything about your internal hosts to the internet at large). ( non company purpose should resolve trough the client home router. Configure the domain which you want to block and point its dns query towards firewall interface IP address. net might return a public IP address result for a host on the internet and a private IP address for hosts on the organization's internal Aug 11, 2021 · Cisco IOS routers also have this feature. Jun 23, 2022 · Split Brain DNS. • DNS uses both User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) on port 53. In other words, you create a view for one or more specific IP address ranges, and then associate that view with one or more I have configured split DNS in pfSense, so all requests to my domain are sent directly to my Unraid box on the SWAG ports. DNS policies ensure that remote clients connected to the VPN Nov 14, 2022 · Set-ItemProperty -Path HKLM:\SOFTWARE\Wireguard -Name DangerousScriptExecution -Type DWord -Value 1. And yet those qualities are hard to come by when you rely on manual processes and disjointed tools. DHCP options. Navigate to NETWORKING > DNS Servers. Select the first option: Create a request Nov 15, 2019 · When split DNS is configured in the Network (Client) Access group policy, AnyConnect tunnels specific DNS queries to the private DNS server (also configured in the group policy). Explicit and transparent proxies. I easily get the software client to use split dns but I can't see how it can possibly work in a lan-to-lan situation. Enabling or Disabling Split DNS. Solution. In order to ensure a secure lookup, the signing must happen at every level in the DNS lookup process. Sep 19, 2002 · In the Advanced server properties for the DNS server, put a checkmark in the Secure cache against pollution checkbox. Core networking technologies. Split DNS uses two separate DNS servers created for the same domain, one for the external network and one for the internal network. External Jan 11, 2022 · Configuring Split DNS. split-tunnel-network-list value VPN_splitTunnelAcl Dec 3, 2012 · To use Split DNS to forward incoming DNS queries, you must have a client that issues DNS queries, a DNS caching name server on which the Split DNS features are to be configured, and a back-end DNS name server. To change the setting for Split DNS on the Security Oct 16, 2020 · The network interface is king in systemd-resolved. Implement split-horizon DNS min. Internal domains are resolved through the configured DNS-server, all internet-DNS is sent to Jun 8, 2020 · How can I split the network traffic on a vpn connected client ( windows 10). In the Content Gateway manager: 1. Split DNS. It automatically resolves global DNS names and local hostnames, e. Jul 29, 2021 · You can use this topic to leverage the traffic management capabilities of DNS policies for split-brain deployments with Active Directory integrated DNS zones in Windows Server 2016. Dec 15, 2023 · Split tunneling is a VPN feature that essentially creates a second tunnel through which some of your online traffic can pass. Hello, community. All other DNS queries are directed outside the VPN tunnel, to a public DNS server. Route 53 Resolver uses the private hosted zone to route DNS queries in the specified VPCs. This includes UDP, TCP, and DNS over HTTPS (DoH). Add the internal domain names to send to these DNS servers for resolution. • At least two external DNS servers should be implemented on unique network addresses and separate hard-ware, ideally on two different networks. 📘. Jan 14, 2008 · Under the User Management > Groups section of the GUI, select the appropriate group, and select Modify Group. The vulnerability occurs because the regular expression (regex) engine that is used with the Split DNS feature Sep 5, 2023 · Split Brain DNS, also known as Split DNS or Split-Horizon DNS, is a networking configuration that allows for the separation of DNS queries based on the source of the request. Information on the Zscaler service's DNS May 3, 2011 · To use Split DNS to forward incoming DNS queries, you must have a client that issues DNS queries, a DNS caching name server on which the Split DNS features are to be configured, and a back-end DNS name server. Introduction min. When a VPN client device connects to the VPN In a typical home network, the router provided by the ISP serves as the local DNS resolver. com. This option is selected by default. Mar 21, 2019 · Split-Brain or Split-Horizon DNS provides different information about the contents of a DNS zone based on the location that the DNS query originates. Even a limited or inconvenient solution would be better than the status quo. When the DNS request reaches the ZTE, the request is open and inspected. For regular internet users, split tunneling comes at the cost of online security and privacy, as traffic outside the encrypted VPN tunnel is unsecured. (Split-view DNS still works if you're using another DNS service for the public hosted zone. You can optimize response time and load by directing queries to the Split-Brain DNS is a DNS configuration method that enables proper name resolution of local resources inside and outside your local network. . Consider the need for DNS records for platform as a service (PaaS) services. Feb 23, 2014 · Split Domain Name System (Split DNS) is an implementation in which separate DNS servers are provided for internal and external networks as a means of security and privacy management. The default "Automatic" selection means the router uses the DNS Mar 11, 2021 · If split DNS is not configured, AnyConnect tunnels all DNS queries. Which of the following DNS countermeasures is being used? DNS Security allows you to detect and prevent DNS tunneling, and enables you to: Monitor and apply policies to all DNS requests and responses, irrespective of the protocol and the encryption used. At the most fundamental level, it refers to using DNS data to enhance the Refer to split DNS. If you’re looking to reproduce this architecture, the following summarizes the correct procedure: Create two sets of servers—one for in front of the firewall, and one for behind it. One DNS server directs external clients to an external server. Nov 15, 2023 · Fact-checked by Miglė Vosyliūtė. We can make progress, but only if we focus on the use cases where a solution is possible. However, it Mar 16, 2024 · Enabling or Disabling Split DNS. Windows Server DNS role. Select Enable proxying of split DNS servers. The problem we're having is if a client needs to launch AnyConnect from one of the branch offices. com, and link virtual network "A" as a registration virtual network DNS Security Extensions (DNSSEC) is a security protocol created to mitigate this problem. To enable proxying of split DNS servers, select Enable proxying of split DNS servers. As DNS is a vital component in any network, please make sure that Split-DNS is setup first before doing anything else. Manageability. Julie configures two DNS servers. 192. example. com: DNS. It allows organizations to consolidate their external and internal DNS infrastructure. So what’s needed here is split-DNS for (static/dynamic) split-exclude tunneling, i. Content Gateway appends this value automatically to a host name that does not include a domain before determining which DNS server to May 20, 2019 · The primary goal when implementing a split-brain DNS solution is to provide a near total disassociation of the internal DNS servers and the perimeter DNS servers. I have set up one subdomain and the root domain in Cloudflare (service1. e. ttm configuration file to set if Split DNS is enabled, disabled, or depends on the client settings. md documentation before enabling this! Share. With this, you can define rules that control DNS requests and responses. When I add this record the office users cannot access the myfqdn. Split-horizon DNS is a term used to describe any nameserver that uses different zone definitions based on the requesting IP. “ "Currently split DNS only applies to split-include tunneling, i. Learn how to configure and manage DNS settings on your FortiGate device, including DNS servers, DNS domains, DNS forwarding, and DNS database. Which of the following DNS countermeasures is she implementing? I am curious if it is possible to have a split dns setup on a lan-to-lan vpn. Enable the Split DNS option. Each VM has a private IP associated. Once you've created a private zone, for example, contoso. zip file will download, typically to your Downloads folder. With Split DNS, network administrators can configure internal network servers and public internet servers to handle the same domain name differently. With Split Brain DNS, a DNS zone is split into two Apr 21, 2023 · Split Versus Standard DNS. We have a virtual network named "A" containing two VMs (VNETA-VM1 and VNETA-VM2). dns file on the server; this is found in the \\system32\dns folder. When you use split-include tunneling, these are the three options you have for the Domain Name System (DNS):. Use the following steps: In the Azure portal, go to the virtual network gateway. FortiGate DNS feature version 7. Navigate to Network | DNS > Settings. DNS security is different. 0. Basic DNS server configuration example. Split DNS is automatically enabled. Scenario: 1) The local DNS server will be used to resolve only the local name server, 2) Global DNS server, in this case, FortiGuard DNS server, will be used to resolve global DNS query. org. You could, for instance, resolve "greatplains. g. They both point to my public IP, which is updated with Cloudflare DDNS. 196. password-storage enable. At the same time open up another terminal and do the same with your LAN network interface: # tcpdump -i enp3s0 udp port 53. int" to the company's main ERP server. In our cloud-powered world, success hinges on fast, reliable and secure DNS. DNS resolution works for the internal DNS domains configured in the split Jan 9, 2023 · In the case of split DNS, administrators can configure internal DNS to return an IP address for a resource based on the source IP address of the name resolution query. On SecuRemote, Split DNS is automatically enabled. com). Windows PowerShell basics. I have a meraki mx64 with no AD integration. FortiGate DNS server. paloaltonetworks. For isolated (disconnected) workloads, host a private DNS zone and a public DNS zone for each subscription to manage split-brain DNS records. By proxying the DNS request, you can enforce your organization’s DNS policies in the Zscaler Zero Trust Exchange (ZTE). Nolan Herring | nolanwifi. The client should use the company DNS to access shared folder. You do not want the Advertisers to perform recursion. "ping www. In Windows Server 2016, DNS policies support is extended to Active Directory integrated DNS zones. Jul 22, 2002 · Split DNS needs to be passed down from the PIX, but it's still a client feature to say that if you're pinging such and such a domain then use this DNS, but if you're pinging this other domain, use that DNS. myfqdn. Enables or disables the Split DNS option. yf zd hq uh hr kl qy ro nt yx