One of the considerations for DirectAccess planning is to decide which DNS names should be resolved internally, by your organization’s internal DNS servers, and which should be resolved externally, using an external (ISP) DNS server configured for your computer’s network interface. This distinction about which DNS server to send each query to is configured on a Windows 7 or Windows Server 2008 R2 computer using entries in the DNS Client resolver’s Name Resolution Policy Table (NRPT).
It’s recommended to use Edge Server role rather than VPN, IPSEC etc. protocols. There is an overhead and added latency when these protocols are used. The Audio/Video and media traffic is highly sensitive to latency and jitter. If you add additional encryption, it will cause delay, because it’s needed to process the traffic on client AND server side for encrypt and decrypt the data. If the traffic goes through DirectAccess network path, it can cause a long delay, jitter. Because the sensivity of A/V and media.
Without split-brain DNS, there is a natural dividing line between the DNS queries that DirectAccess and the NRPT should send to internal DNS and those that should stay on the internet. But beware! If you have split-brain DNS you may need to make some special allowances for DNS queries that should stay on the internet. Continue reading
