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The following network protocols are available for use with SQL Server 2008: Shared Memory Enabled by default on all editions of SQL Server 2008, the Shared Memory protocol is used purely for local connections to an instance running on the same machine. Named Pipes For all editions of SQL Server, Named Pipes is enabled by default for local connections only, with network connectivity over named pipes disabled. TCP/IP The TCP/IP protocol is enabled by default for the Enterprise, Standard, and Workgroup editions of SQL Server, with the protocol disabled for the Developer, Express, and all other installations. VIA A specialized protocol developed for use with specific hardware, the VIA protocol is disabled by default for all installations of SQL Server. Note that an upgraded instance of SQL Server will preserve the pre-upgrade network configuration settings. Banyan VINES, Multiprotocol, AppleTalk, and NWLink IPX/ SPX are no longer supported in SQL Server 2008. Looking at the protocols in the previous list, if we set aside VIA as a specialist choice and ignore Shared Memory as a local protocol only, the only two choices for a networked installation of SQL Server are TCP/IP and Named Pipes. TCP/IP is the most widely used network protocol. Compared to Named Pipes, it provides better security and performance, particularly when used over a WAN or slower network. From both performance and security perspectives, unused protocols should be disabled and, ideally, a single network protocol chosen for SQL Server communication. In almost all cases, TCP/IP should be used as the standard protocol for SQL Server instances, with all other protocols disabled. You enable and disable network protocols using the SQL Server Configuration Manager, as shown in figure 6.2.

Solution: Graph the function as shown in Fig 7-6

Once it s enabled, you need to configure TCP/IP for maximum security by assigning a static TCP port along with appropriate firewall protection.

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Each SQL Server instance listens for client requests on a unique TCP/IP address/ port number combination In SQL Server 7 and earlier, we were restricted to installing a single instance per server, with the instance listening on port 1433 To support the installation of multiple named instances per server, SQL Server 2000 introduced dynamic ports Dynamic ports ease the configuration requirement for unique ports in a multiinstance installation Rather than having to manually assign each named instance a unique port number, you can use dynamic ports That way, SQL Server will automatically choose a free port number when an instance starts up By default, each named1 SQL Server instance is configured to use dynamic TCP/IP ports This means that each time a named instance of SQL Server is started, the TCP port used may be different.

The SQL Server Browser service responds to client connection requests with the port number that the requested instance is running on, thus avoiding the need for client applications to be aware of the port number an instance is currently using As we saw in chapter 4, the setup process sets the browser service s startup type to automatic Dynamic ports present a problem for firewall configuration An attempt to secure a SQL Server instance behind a firewall by only opening a specific port number will obviously fail if the port number changes, courtesy of the dynamic port option For this reason, static ports are the best (and most secure) choice when placing SQL Server behind a firewall.

A = 81

In return for the additional configuration required to assign each SQL Server instance a static port number, the appropriate ports can be opened on the firewall without running into the connection failures typical with dynamic ports When assigning a static TCP port, avoid using ports currently (and commonly) used by other services and applications The IANA registration database, available at http://wwwianaorg/assignments/port-numbers, is an excellent resource for this purpose; it lists registered port numbers for common applications, as well as safe ranges to use for SQL Server instances As you can see in figure 63, you can set an instance to use a static TCP port by using the SQL Server Configuration Manager tool Simply delete the TCP Dynamic Ports entry for IPAll2 and enter a port number in TCP Port In our example, we ve chosen port 49153 The SQL Server Browser service runs on port 1434.

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