Configuring DB2 Clients in a Three-Tier Environment

In this environment, the clients connect to a gateway with DB2 Connect Enterprise Edition installed. The gateway serves as a DRDA application requester to the host. In our example, we used the workstation of CLIENT1, with only the client application enabler installed, to connect to the host via the DB2 connect gateway of SERVER1.

Configure the Host

Refer to the Configure TCP/IP for DB2 UDB for OS/390 from the above section.

Configure DB2 Connect Gateway to Accept Incoming Clients

To accept incoming clients, the necessary protocols have to be started first. Normally, you configure these protocols with the installation of DB2 Connect. The most common protocol used is TCP/IP, so we document only the usage of TCP/IP between the client and the server. Protocols are started during the start of DB2. The following are automatically configured (if, during installation of DB2 Connect, you configured TCP/IP) for you to accept incoming clients.

You can always configure TCP/IP after installation of DB2 Connect by doing the following:

  • Update the DB2COMM registry value to include TCP/IP:

    db2set DB2COMM=TCPIP
    • You can check your DB2COMM value with:

      db2set ?all
  • Update the services file on c:\winnt\system32\drivers\etc. The following port should be there. You can choose any available port number and name. The default port is 50000.

    db2cDB2 50000/tcp           #connection port for the DB2 instance DB2
  • Update the service name (SVCENAME) parameter in the database manager configuration file:

    db2 update dbm cfg using svcename db2cDB2


    The service name is case-sensitive.

  • Stop and restart the database instance.

Configure the DB2 Client

From the DB2 client, you can use the Client Configuration Assistant or the command line processor to configure your access to the DB2 host subsystem:

  • Log on to the system with a valid DB2 user ID.

  • Start the Configuration Assistant using the db2ca command.

  • Search for servers.

  • Test the connection using Configuration Assistant.


  • Catalog the TCP/IP node on the DB2 client:

    db2 catalog tcpip node node_name remote hostname
      server service_name
    db2 catalog tcpip node nserver1 remote
      server 50000
  • Catalog the database on the DB2 client:

    db2 catalog database database_name as database_alias
      at node node_name
    db2 catalog database db2t as db2t at node nserver1
  • Test the client-server connection:

    db2 connect to db2t user os390id
    db2 "select * from sysibm.sysdummy1"
    db2 terminate