IPv6 and Lotus Domino
Because support for IPv6 by hardware and operating system suppliers and the Internet is still in the early stages, moving to the IPv6 standard will be a gradual process for most organizations. In Lotus Domino, you can enable IPv6 support for SMTP, POP3, IMAP, LDAP, and HTTP services on AIX®, Solaris®, and Linux systems.

Domino supports both IPv6 and IPv4. Thus, if an IPv6-enabled Domino server encounters an IP address in IPv4 format, the Domino server can still make the connection to that address.

In DNS, records that store IPv6 addresses are called AAAA records. After you enable IPv6 on a Domino server and add the server's AAAA record to DNS, another IPv6-enabled Domino server can connect to it only over IPv6. Servers that don't support IPv6 can run Domino with IPv6 support disabled, which is the default. These servers can successfully connect to IPv6-enabled Domino servers only if the DNS for the IPv6 servers contain A records.

Using IPv6 in a Domino network

For best results when using IPv6 with Domino servers, set up network devices in the network pathway to connect directly with native IPv6, rather than tunnel through the IPv4 network.

How Lotus Domino decides whether to connect over IPv6 or IPv4

A Domino server evaluates the address format and then, based on that information, makes an IPv4 or an IPv6 connection.
Address formatServer response
IPv4Makes an IPv4 connection.
IPv4 address mapped to IPv6Attempts to make an IPv6 connection and waits for the TCP/IP software to make either an IPv6 or IPv4 connection, depending on the remote system's TCP/IP stack.
IPv6Makes an IPv6 connection.
Server nameUses DNS to resolve the name:
  • If only an A record is found, connects over IPv4.
  • If only an AAAA record is found, connects over IPv6 or waits for the TCP/IP software to make the connection.
  • If both an A record and AAAA record are found, uses the AAAA record.

See Also