Also, both
InternalDNSAdapterGuid and ExternalDNSAdapterGuid are all zeros, indicating that DNS lookups
will be performed using any available adapter on the server. To use a list of DNS servers other than those
on the adapter, first disable InternalDNSAdapterEnabled and ExternalDNSAdapterEnabled by
setting them to false using the Set-TransportServer cmdlet, then specify the DNS servers using
the ExternalDNSServers or InternalDNSServers parameter. If multiple adapters exist and you
Part II: Working with Server Roles
198
Figure 7-5
Chapter 7: Confi guring the Hub Transport Role
199
intend to use a specific adapter, specify the adapter by its GUID. The GUID can be obtained using the
Get-NetworkConnectionInfo cmdlet.
Figure 7 - 7 shows how to configure the transport server to use a specific adapter for internal and external
lookup by specifying its GUID and view changes made.
Back Pressure
Hub Transport and Edge Transport servers monitor important system resources using the back pressure
feature. System resources monitored include available disk space and memory. This feature enables
transport servers to reject new connections and messages when a configured resource threshold is
reached. In the RTM release of Exchange Server 2007, the disk resource limit was 4GB, hence if a Hub
Transport server has less than 4GB of drive space all new mail processing stops.
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