Summary: Review the DNS considerations in this topic before implementing Skype for Business Server.
This article only addresses DNS planning for Skype for Business Server deployments on an organization's on-premise network. For Skype for Business Online refer to 'Office 365 URLs and IP address ranges' at https://aka.ms/o365ips.
A Domain name service (DNS) server maps hostnames (like www.contoso.com, presumably a web server) to IP addresses (such as 10.10.10.10). It helps clients and interdependent servers communicate with each other on the network. When you set up an implementation of Skype for Business Server 2015 you'll need to make sure the mapping of new server names (usually reflecting the role they'll be taking on) matches the IP addresses they are assigned to.
While this may seem a bit daunting at first, the heavy lifting for planning this can be done using the Skype for Business Server 2015 Planning Tool. Once you've gone through the wizard's questions about what features you plan to use, for each site you define you can view the DNS Report within the Edge Admin Report, and use the information listed there to create your DNS records. You can also make adjustments to many of the names and IP addresses used, for details see Review the DNS Report. Keep in mind you can export the Edge Admin Report to an Excel spreadsheet, and the DNS Report will be one of the worksheets in the file. While this tool includes features deprecated from Skype for Business Server 2019, it can still be used to create an initial plan if those features are not selected
When you are installing a new implementation as described in Create DNS records for Skype for Business Server and building your topology for Skype for Business Server, we recognize that you can choose to use the DNS capabilities built in to Windows Server 2016 or a third-party DNS package, so we'll keep the discussions in this article general rather than specific. We're detailing what's needed, and how you meet that need is your decision to make.
Experienced Skype for Business, Lync, and Office Communications Suite administrators will probably find the following tables useful. If the table is confusing to you, the later sections or articles will shed some light on the following concepts:
Summary tables
The following tables show DNS records Skype for Business Server uses to provide services to users. Some are optional in that they are only needed to support certain features, and they can be skipped if those features are not desired. The DNS records needed for internal access only are in the first table, and a deployment allowing internal and external access will need records from both tables.
Internal DNS mappings
❶ Used by a client to discover the Front End Server or Front End pool, and be authenticated and signed in as a user. More detail on this is in Walkthrough of Skype for Business clients locating services.
❷ This is only required to support legacy clients prior to Lync 2013, and desktop handsets.
If you're using the next version of Office (That's Office 2016, Preview available for download here), you're already using the new Skype for Business client. If you used Lync before and now you find that your address book is not up to date and you get the 'Address book synchronizing.
❸ In the situation where a Unified Communications device is turned on, but a user has never logged into the device, the A record allows the device to discover the server hosting Device Update Web service and obtain updates. Otherwise, devices obtain the server information though in-band provisioning the first time a user logs in.
The following diagram shows an example that includes both internal and external DNS records, and many of the records shown in the surrounding tables:
Edge network diagram using Public IPv4 addresses
Perimeter network DNS mappings (both internal and external interfaces)
❶ Required to deploy Federation, otherwise optional.
❷ Used by a client to discover the front end server or Front End pool, and be authenticated and signed in as a user.
❸ This requirement applies only to clients on Apple or Microsoft based mobile devices. Android and Nokia Symbian devices do not use push notification.
For more detail on Edge Servers and perimeter networks, see the Edge server DNS planning content.
Important
Skype for Business Server supports the use of IPv6 addressing. See Plan for IPv6 in Skype for Business for more details.
Important
For more detail on FQDNs, see DNS basics.
Split brain DNS
Split brain DNS is a DNS configuration where you have two DNS zones with the same namespace. The first DNS zone handles internal requests, while the second DNS zone handles external requests, as mentioned in these tables. For more about this see Split-brain DNS.
Hybrid considerations
If you plan to have some users homed online and some homed on premises, refer to the Hybrid connectivity planning article Skype for Business server 2019. You will need to configure DNS as normal for Skype for Business Server 2015 and also add additional DNS records.
You should also refer to 'Office 365 URLs and IP address ranges' at https://aka.ms/o365ips to confirm that your users will have access to the online resources they will need.
Simple URLs
A Uniform Resource Locator (URL) is a reference to a web resource that specifies its location on a computer network and a protocol used to retrieve it.
Skype for Business Server supports using three 'simple' URLs to access services:
Simple URLs are discussed in more detail at DNS requirements for simple URLs in Skype for Business Server.
DNS by server role
You can set the names of these pools and servers as you wish, but make them memorable and reflect their function in the system.
DNS records for individual servers or pools
These generic record requirements apply to any server role used by Skype for Business. A pool is a set of servers running the same services that work together to handle client requests directed to them through a load balancer. See Load balancing requirements for Skype for Business for details
DNS record Requirements for Server/pool roles (presumes DNS load balancing)
Edge Server specific DNS topics
To plan edge server deployment, review Plan for Edge Server deployments in Skype for Business Server 2015, and Advanced Edge Server DNS planning for Skype for Business Server 2015 which has the following sections
For members of the Office Insider program, get the latest information about security fixes and improvements in Skype for Business on Mac.
Note: You can provide feedback directly to the Microsoft product team by using the Report an Issue link and menu options in Skype for Business on Mac.
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