DNS Requirements for Mobility
Topic Last Modified: 2011-11-14
When you deploy the Lync Server 2010 mobility feature, you can use the new URLs that are available with the new Microsoft Lync Server 2010 Autodiscover Service, or you can use your existing Web Services URLs. If you use your existing URLs, users need to manually enter the URLs in their mobile device settings. This option is typically used for troubleshooting. When you use the new URLs, mobile clients can automatically discover Lync Server resources. When you support automatic discovery, you need to add new Domain Name System (DNS) records. This section describes the DNS records that are required for automatic discovery.
To support automatic discovery, you need to create the following DNS records for each SIP domain:
An internal DNS record to support mobile users who connect from within your organization's network
An external, or public, DNS record to support mobile users who connect from the Internet
The internal automatic discovery URL should not be addressable from outside your network. The external automatic discovery URL should not be addressable from within your network. However, if you cannot meet this requirement for the external URL, mobile client functionally should not be affected.
The DNS records can be either CNAME records or A (host) records.
Internal DNS records
You need to create one of the following internal DNS records:
| Record type | Host name | Resolves to |
|---|---|---|
CNAME |
lyncdiscoverinternal.<sipdomain> |
Internal Web Services fully qualified domain name (FQDN) for your Director pool, if you have one, or for your Front End pool if you do not have a Director |
A (host) |
lyncdiscoverinternal.<sipdomain> |
Internal Web Services IP address (virtual IP (VIP) address if you use a load balancer) of your Director pool, if you have one, or of your Front End pool if you do not have a Director |
External DNS records
You need to create one of the following external DNS records:
| Record type | Host name | Resolves to |
|---|---|---|
CNAME |
lyncdiscover.<sipdomain> |
External Web Services FQDN for your Director pool, if you have one, or for your Front End pool if you do not have a Director |
A (host) |
lyncdiscover.<sipdomain> |
External or public IP address (VIP address if you use a load balancer) of the reverse proxy |
Note
This traffic goes through the reverse proxy.