Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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## Prerequisites

Before setting up and configuring HADB, make sure your environment meets the following requirements:

- IPv4 is enabled. HADB supports IPv4 only. Disable IPv6 on the interfaces being used for HADB.

- The network (routers, switches, and network interfaces on the hosts) must be configured for User Datagram Protocol (UDP) multicast. If HADB hosts span multiple subnets, configure routers between the subnets to forward UDP multicast messages between the subnets.

- Configure any firewalls located between HADB hosts, or between HADB and Application Server hosts to allow all UDP traffic, both ordinary and multicast.

- Do not use dynamic IP addresses (assigned by Dynamic Host Configuration Protocol, or DHCP) for hosts that are part of `hadbm createdomain`, `hadbm extenddomain`, `hadbm create,` or `hadbm` `addnodes` commands.

- Previous: Overview of High Availability Database
- Next: Configuring Network Redundancy

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