Datasheet

24
Chapter 1

Designing and Planning Messaging Services
Avoiding Pitfalls by Providing Technical Recommendations
The following list provides ways to avoid potential pitfalls on the network topology side. Any
problems must be rectified before Exchange Server 2007 can be installed at the location.

Make sure that the physical network speed of locations that will host Exchange Server
2007 have at least 64 Kb per second of bandwidth available.

Exchange Server 2007 supports TCP/IP v4 (IPv4) addresses only, not IPv6 addresses. If
you already implemented IPv6 addresses anywhere in your company, make sure that the
company also supports IPv4 addresses; otherwise the clients will not be able to commu-
nicate with Exchange Server 2007.

IP subnets should map to the locations of the company and should be non-overlapping
between locations. However, sometimes single locations have multiple IP subnets, which is
fine. If IP subnets are spanned between multiple physical locations, make sure the WAN link
between them matches LAN link speed—i.e., 10 megabits per second (Mbps) or more.

Make sure your Active Directory sites match IP subnets for each location.

Domain Name System (DNS) must be used for network name resolution.

DNS is configured correctly in your Active Directory forest, using a single, unified
namespace.

Active Directory uses service (SRV) resource records in DNS to register a list of domain
controllers for client use. If you do not use Windows Server 2003 DNS Service for Active
Directory, make sure that your DNS server software supports this!

DNS must be able to resolve Internet DNS URLs to successfully deliver messages to the
Internet. The DNS configuration must allow this.

The company must have its own domain and domain name. Exchange Server 2007
requires an appropriate mail exchanger (MX) resource record in DNS to receive messages
from the Internet.

You cannot use a disjoint DNS namespace! A disjoint namespace is the scenario in which
the primary DNS suffix of a computer does not match the suffix of the domain name
where that computer resides.
Designing and Planning for
New Exchange Features
Several new features in Exchange Server 2007 need special consideration in your design. For
automation of administrative tasks you can use the Exchange Management Shell, or you can
implement voice access to your mailboxes using the Unified Messaging server role. It is also
worth considering in your design that the Edge Transport server role can replace existing
third-party smart hosts. They are covered in this section.
81461.book Page 24 Wednesday, December 12, 2007 4:49 PM