Deploying F5 With Microsoft Exchange 2016 Mailbox Servers

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F5 Deployment GuideDeploying F5 with Microsoft Exchange 2016 Mailbox ServersWelcome to the F5 and Microsoft Exchange 2016 deployment guide. Use this document for guidance on configuring the BIG-IPsystem version 11 and later to provide additional security, performance and availability for Exchange Server 2016 Mailbox servers.When configured according to the instructions in this guide, whether using an iApp template or manually, the BIG-IP system performsas a reverse proxy for Exchange Mailbox servers, and also performs functions such as load balancing, compression, encryption,caching, and pre-authentication.Why F5?F5 offers a complete suite of application delivery technologies designed to provide a highly scalable, secure, and responsive Exchangedeployment. he BIG-IP LTM can balance load and ensure high-availability across multiple Mailbox servers using a variety of loadTbalancing methods and priority rules. TerminatingHTTPS connections at the BIG-IP LTM reduces CPU and memory load on Mailbox Servers, and simplifies TLS/SSL certificate management for Exchange 2016. he BIG-IP Access Policy Manager (APM), F5's high-performance access and security solution, can provide preTauthentication, single sign-on, and secure remote access to Exchange HTTP-based client access services. he BIG-IP Advanced Firewall Manager (AFM), F5's high-performance, stateful, full-proxy network firewall designed to guardTdata centers against incoming threats that enter the network can help secure and protect your Exchange deployment. he BIG-IP LTM TCP Express feature set ensures optimal network performance for all clients and servers, regardless ofToperating system and version. The LTM provides content compression features which improve client performance.Products and versionsProductVersionMicrosoft Exchange Server2016 (for previous versions of Exchange, see systemManual configuration: 11.0 - 12.0iApp template: 11.4.1 - 12.0BIG-IP iApp exchange 2016 cas.v1.0.0rc2Deployment Guide version1.3 See Document Revision History on page 115 for revision detailsLast updated04-28-2016Important: M ake sure you are using the most recent version of this deployment guide, available change-2016-dg.pdfFor previous versions of this and other guides, see the Deployment guide Archive tab on archive-608

ContentsIntroduction 3What is F5 iApp? 3Prerequisites and configuration notes 4iApp Deployment Scenarios 7Local BIG-IP system load balances and optimizes traffic 7 Local LTM receives HTTP-based traffic forwarded by a remote APM 8Local APM secures and forwards traffic to a remote LTM 9Preparation worksheets 10Configuring the BIG-IP system for Microsoft Exchange using the iApp template 12Downloading and importing the new iApp 12Getting started with the Exchange iApp template 12Configuring the local LTM to receive HTTP-based traffic forwarded by a remote APM 34Configuring a local APM to secure and forward traffic to a remote LTM 46Modifying the iApp configuration 54Optional: Configuring BIG-IP LTM/APM to support NTLMv2-only deployments 55Troubleshooting 58Appendix A: Configuring additional BIG-IP settings 65Appendix B: Using X-Forwarded-For to log the client IP address 66Appendix C: Manual configuration tables 68Configuration table if using a combined virtual server for Exchange HTTP-based services 68Configuration table if using separate virtual servers for Exchange HTTP-based services 71BIG-IP APM manual configuration 85Optional: Securing Access to the Exchange Administration Center with BIG-IP APM 96Optional: Configuring the APM for Outlook Anywhere with NTLM Authentication - BIG-IP v11.3 or later only 100Manually configuring the BIG-IP Advanced Firewall Module to secure your Exchange deployment 105Appendix D: Technical Notes 110Appendix E: Active Directory and Exchange Server configuration for NTLM 112BIG-IP APM/LTM without DNS lookups 114Document Revision History 115F5 Deployment Guide2Microsoft Exchange Server 2016

IntroductionThis document provides guidance for using the updated, downloadable BIG-IP iApp Template to configure the Mailbox serverrole of Microsoft Exchange Server, as well as instructions on how to configure the BIG-IP system manually. This iApp template wasdeveloped for use with Exchange Server 2016.You can configure the BIG-IP system to support any combination of the following services supported by Mailbox servers: OutlookWeb App (which includes the HTTP resources for Exchange Control Panel), Exchange Web Services, Outlook Anywhere (RPC overHTTP, including the Offline Address Book), ActiveSync, Autodiscover, POP3, IMAP4, and MAPI over HTTP.For more information on the Exchange 2016 see: 91(v exchg.160).aspxFor more information on the F5 devices in this guide, see can also see the BIG-IP deployment guide for SMTP services at: .pdf.You can also visit the Microsoft page of F5’s online developer community, DevCentral, for Microsoft forums, solutions, blogs and more: provide feedback on this deployment guide or other F5 solution documents, contact us at is F5 iApp?New to BIG-IP version 11, F5 iApp is a powerful set of features in the BIG-IP system that provides a new way to architect applicationdelivery in the data center. iApp includes a holistic, application-centric view of how applications are managed and delivered inside,outside, and beyond the data center. The iApp template for Microsoft Exchange Server acts as the single-point interface for building,managing, and monitoring the Exchange 2016 client access role.For more information on iApp, see the White Paper F5 iApp: Moving Application Delivery Beyond the -wp.pdf.Skip aheadAdvancedIf you are already familiar with the Exchange iApp, you can skip directly to the relevant section after reading the prerequisites: Configuring the BIG-IP system for Microsoft Exchange using the iApp template on page 12 if using the iApp template, orAppendix C: Manual configuration tables on page 68 if configuring the BIG-IP system manually.F5 Deployment Guide3Microsoft Exchange Server 2016

Prerequisites and configuration notesUse this section for important items you need to know about and plan for before you begin this deployment. Not all items will apply inall implementations, but we strongly recommend you read all of these items carefully.General BIG-IP system prerequisiteshh F or this deployment guide, the BIG-IP system must be running version 11.4.1 or later. If you are using a previous version ofthe BIG-IP system, see the Deployment Guide index on Ths guide does not apply to previous versions.hh M ost of the configuration guidance in this document is performed on F5 devices. We provide a summary of Exchangeconfiguration steps for reference only; for complete information on how to deploy or configure the components of MicrosoftExchange Server, consult the appropriate Microsoft documentation. F5 cannot provide support for Microsoft products.hh If deploying BIG-IP APM features, you must fully license and provision APM before starting the iApp template.hh T his document provides guidance on using the Exchange iApp template. Additionally, for users familiar with the BIG-IPsystem, there are manual configuration tables at the end of this guide. Because of the complexity of this configuration, westrongly recommend using the iApp to configure the BIG-IP system.hh F 5’s advanced health monitors for Autodiscover, Exchange Web Services, and Outlook Anywhere support Basic andNTLMv1 authentication only. If using NTLM v2, even if you select Advanced monitors in the iApp, simple monitors will beused. See Troubleshooting on page 58 for more information.iApp template prerequisites and noteshh This document provides guidance on using the F5 supplied downloadable iApp template for Microsoft Exchange 2016available via in the RELEASE CANDIDATE directory. The latest fully supported official release can alwaysbe found at: 000/400/sol13497.html.You must use a downloadable iApp for BIG-IP versions 11.0 and later. For the iApp template, you must be usingversion 11.3 or later as it contains a number of fixes and enhancements not found in the default iApp, or other downloadableversions.!Warning To run the Microsoft Exchange iApp template, you must be logged into the BIG-IP system as a user thatis assigned the admin role. For more information on roles on the BIG-IP system, see the BIG-IP UserAccounts chapter of the BIG-IP TMOS: Concepts guide.hh B IG-IP APM v12.0 and later now supports the MAPI over HTTP transport protocol (introduced in Exchange 2013 SP1 andincluded in 2016 7(v exchg.150).aspx).If you are using BIG-IP APM v11.x, the iApp template does not support this new protocol. See Manually configuring MAPIover HTTP in Exchange on page 79 for manual instructions on configuring the BIG-IP system for MAPI over HTTP forthe 11.x versions.hh I f you have existing, manually created Node objects on the BIG-IP system and given these nodes a name, you cannot usethe IP addresses for those nodes when configuring the iApp. You must first manually delete those nodes and re-add themwithout a name, or delete the nodes and let the iApp automatically create them.hh F or some configuration objects, such as profiles, the iApp allows you to import custom objects you created outside thetemplate. This enables greater customization and flexibility. If you have already started the iApp template configuration andthen decide to you want to create a custom profile, you can complete the rest of the template as appropriate and then reenter the template at a later time to select the custom object. Otherwise you can exit the iApp immediately, create the profile,and then restart the iApp template from the beginning.SSL certificate and key prerequisites and noteshh I f you are using the BIG-IP system to offload SSL or for SSL Bridging, we assume you have already obtained an SSLcertificate and key, and it is installed on the BIG-IP LTM system. To configure your Mailbox servers to support SSLoffloading, you must first follow the Microsoft documentation. hange-2010.aspx.Make sure you follow the correct steps for the version of Exchange Server that you are using.hh W e generally recommend that you do not re-encrypt traffic between your BIG-IP APM and BIG-IP LTM because both BIGIP systems must process the SSL transactions. However, if you choose to re-encrypt, we strongly recommend you use avalid certificate (usually SAN-enabled) rather than the default, self-signed certificate for the Client SSL profile on your BIG-IPLTM system. If not re-encrypting traffic, you do not need a certificate on your BIG-IP LTM.F5 Deployment Guide4Microsoft Exchange Server 2016

hh T his template currently only supports the use of a single DNS name and corresponding certificate and key for all services,or multiple DNS names using a SAN-enabled certificate and key.hh I f using a single virtual server for all HTTP-based client access services as recommended, you must obtain the SubjectAlternative Name (SAN) certificate (or wildcard certificate, see the next paragraph) and key from a 3rd party certificateauthority that supports SAN certificates, and then import it onto the BIG-IP system.While the BIG-IP system supports using a wildcard certificate to secure Exchange deployments using multiple FQDNs, forincreased security, F5 recommends using SAN certificate(s) where possible. Additionally, some older mobile devices areincompatible with wildcard certificates. Consult your issuing Certificate Authority for compatibility information. Note: For more information on SAN certificates, see Subject Alternative Name (SAN) SSL Certificates on page 110.BIG-IP Access Policy Manager prerequisites and noteshh I f you want to display the computer type (public/shared vs private) and light version (Use the light version of OutlookWeb App) options for OWA on the APM logon page via the BIG-IP APM, you must run the following PowerShellcommand on one of your Mailbox Servers (only one): Get-OwaVirtualDirectory bled true -LogonPagePublicPrivateSelectionEnabled truehh I f you are deploying the iApp template for APM and smart card authentication for Outlook Web App, you must be usingKerberos authentication. This only applies to Outlook Web App (OWA).hh If you are using BIG-IP APM, the following table shows the Exchange Server (Mailbox Server) settings:RoleOut-of-the-box settingYour SettingNotesNot enabledEnabledOptional but strongly recommendedFormsForms (default) orNTLM, orWindows authentication(smart card)RequiredNegotiateNegotiate (default)RequiredBasicBasic (default)RequiredOutlook Anywhere Authentication 1,3NegotiateBasic (default)or NTLMRequiredMAPI-over-HTTP 4NegotiateBasic (default)or NTLMRequiredSSL Offload for all HTTP services 12OWA Authentication1Autodiscover Authentication 1ActiveSync Authentication 12Exchange Server 2010 and 2013 SP1 and later only. See the following link for more information on default authentication methods for Exchange Server 331973.aspxY ou must change the default Forms logon format from Domain\username to just username. More information is available later in this guide.3O utlook Anywhere is disabled by default in Exchange 2010; you must enable it before you can use it. You can optionally configure BIG-IP APM v11.3 andlater for NTLM authentication for Outlook Anywhere. See page 50.4MAPI-over-HTTP requires BIG-IP v12.0 or later for APM1 2F5 Deployment Guide5Microsoft Exchange Server 2016

iImportant The values in the following table are only examples, use the values appropriate for your configuration.In our example, we use the following conventions.RoleFQDNsDNS RecordsExternal URL/Host nameCombined virtual serverA: mail.example.commail.example.comAutodiscoverSRV: autodiscover. port443, Host todiscover/autodiscover.xmlSeparate virtual serversautodiscover.example.comA: autodiscover.example.comSRV: autodiscover. port443, Host the external DNS SRVrecord listed is not used, andyou don’t want to use SCPinternally, you must also haveat least one of these, set to thesame IP as your OWA FQDN:example.comautodiscover.example.comCombined virtual servermail.example.comOutlook Web AppA: mail.example.com owa.example.com -Server-ActiveSyncA: soft-Server-ActiveSyncSeparate virtual serversowa.example.comCombined virtual servermail.example.comActiveSyncSeparate virtual serversmobile.example.comCombined virtual servermail.example.comA: mail.example.commail.example.comA: oa.example.comoa.example.comA: mail.example.com ate virtual serversOutlook Anywhere(RPC over HTTP)oa.example.comTo prevent internal users fromreceiving a password prompt,your internal DNS must nothave an A record for the FQDNfor Outlook Anywhere. Thisonly applies if you are usingExchange 2010, using RPCMAPI internally and OutlookAnywhere externally, and yourinternal clients do not have aroute to the external OutlookAnywhere/EWS virtual server(s).Combined virtual serverOutlook Anywhere(MAPI over HTTP)mail.example.comSeparate virtual serversmapi.example.comFor more information, see: Summary of SRV records on Wikipedia: record Specification for SRV records (RFC2782): Microsoft KB article on SRV records and the Autodiscover service: Understanding the Autodiscover Service (including SCP information): 1.aspxF5 Deployment Guide6Microsoft Exchange Server 2016

iApp Deployment ScenariosThe iApp greatly simplifies configuring the BIG-IP system for Microsoft Exchange 2016 client access roles. Before beginning theApplication template, you must make a decision about the scenario in which you are using BIG-IP system for this deployment. TheiApp presents the following three deployment options. You choose one of these options when you begin configuring the iApp. Local BIG-IP system load balances and optimizes traffic, on this page Local LTM receives HTTP-based traffic forwarded by a remote APM on page 8 Local APM secures and forwards traffic to a remote LTM on page 9Local BIG-IP system load balances and optimizes trafficYou can select this scenario to manage, secure, and optimize client-generated mailbox traffic using the BIG-IP system. This is thetraditional role of the BIG-IP LTM and should be used in scenarios where you are not deploying BIG-IP Access Policy Manager (APM)on a separate BIG-IP system. In this scenario, you can optionally the BIG-IP APM to secure HTTP-based virtual servers on thissystem.You would not select this option if you intend to deploy a separate APM that provides secure remote access to HTTP-based services.Client Access 23autodiscover.example.comEASOABBIG-IP PlatformRPCMAPIAutodiscoverFigure 1: Logical configuration example showing the BIG-IP system directing traffic to client access ServicesThe traffic flow for this scenario is:1.All Exchange Mailbox traffic goes to the BIG-IP system.2. You can use the following optional modules if they are licenced and provisioned on you BIG-IP system:3. IG-IP Access Policy Manager (APM)BThe BIG-IP APM module provides secure access and proxied authentication (pre-authentication) for HTTP-based Mailboxservices: Outlook Web App, Outlook Anywhere, ActiveSync, and Autodiscover). The BIG-IP APM presents a login pageto end users that takes the place of the forms-based login page normally presented by Outlook Web App. Users providecredentials through the BIG-IP APM form; the BIG-IP APM then authenticates the user to Active Directory. IG-IP Advanced Firewall Manager (AFM)BThe BIG-IP Advanced Firewall Manager (AFM) is a high-performance, stateful, full-proxy network firewall designed to guarddata centers against incoming threats that enter the network on the most widely deployed protocols. he BIG-IP LTM load balances and optimizes the Exchange client traffic to the Mailbox servers, including the services which areTnot HTTP-based: POP3, and IMAP4.F5 Deployment Guide7Microsoft Exchange Server 2016

Local LTM receives HTTP-based traffic forwarded by a remote APMYou can select this scenario to configure BIG-IP LTM with a single virtual server that receives Exchange HTTP-based traffic that hasbeen forwarded by a separate BIG-IP APM. The virtual server can also accommodate direct Exchange client traffic, e.g. internal clientsthat do not use the BIG-IP APM, and non-HTTP traffic that is not handled by BIG-IP APM such as POP3 and IMAP4.This scenario would be used together with the following scenario, in which you configure a separate BIG-IP APM to send traffic to thisBIG-IP LTM device.Client Access coverInternalClientsFigure 2:Logical configuration example showing the BIG-IP system receiving

Deploying F5 with Microsoft Exchange 2016 Mailbox Servers Welcome to the F5 and Microsoft Exchange 2016 deployment guide. Use this document for guidance on configuring the BIG-IP system version 11 and later to provide additional security, performance and availability for Exchange Server 2016 Mailbox servers.

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