Screening router firewalls

The screening router firewall is also known as a network level or packet-filter firewall. Such a firewall works by screening incoming packets by protocol attributes. The protocol attributes screened may include source or destination address, type of protocol, source or destination port, or some other protocol-specific attributes.

For all firewall solutions (except SOCKS), you need to ensure that all the ports used by DB2® database are open for incoming and outgoing packets. DB2 database uses port 523 for the DB2 Administration Server (DAS), which is used by the DB2 database tools. Determine the ports used by all your server instances by using the services file to map the service name in the server database manager configuration file to its port number.