Dynamic Server Support for IPv6 Addresses

Dynamic Server recognizes Internet Protocol Version 6 (IPv6) addresses, which are 128-bits long, on many platforms.

On all platforms, Dynamic Server supports Internet Protocol Version 4 (IPv4) addresses, which are 32-bits long.

4IBM Informix Dynamic Server Version 10.00.UC4 and CSDK 2.90.UC4 4initially check to determine whether IPv6 is supported in the underlying operating 4system. If IPv6 is supported, the IPv6 address is used. If the underlying 4operating system does not support IPv6, the IPv4 address is used. Dynamic 4Server and CSDK retrieve the IP address from the name service.

You can treat Dynamic Server that runs on a host with both IPv4 and IPv6 addresses the same way you treat a server running on a multi-homed host. You can configure Dynamic Server on a host with both IPv4 and IPv6 addresses in either of the following ways:

• Create aliases (using the DBSERVERALIASES configuration parameter) and assign an IPv6 address to one of them and an IPv4 address to the other.
• Instruct the Dynamic Server to listen on all the IP addresses configured on the host by using a wild-carded hostname in the SQLHOSTS file.

  For example:

  olserver1   oltlitcp   *myhost   olservice1

  Note the asterisk in front of the hostname. This is the same naming scheme that currently exists for the servers in a multi-homed host. Starting with Dynamic Server Version 10.0, the hostname entry in the SQLHOSTS file maps to an IPv6 address if the host has a configured IPv6 address. If the host does not have a configured IPv6 address, the hostname entry maps to an IPv4 address. The hostname with a preceding asterisk maps to a wildcard address.