Concurrent IPv4 and IPv6 connections

For EEDLC, you can configure the link either by IP address or host name and run IPv4 and IPv6 connections concurrently.
  1. For Enterprise Extender (HPR/IP), the ports at both ends of a link must use the same addressing format (IPv4 or IPv6).
  2. If Communications Server for Windows® uses IPv4, it can connect only to remote systems that are configured to support IPv4.
  3. If Communications Server for Windows® uses IPv6, you can configure it to use either IPv4 or IPv6, provided you have configured the respective Enterprise Extender port on the server. The option you choose must match the configuration at the remote system.
  4. All links on the same Enterprise Extender port must use the same addressing format (IPv4 or IPv6).
  5. If you need to support links with different addressing formats, you must use separate ports. Similarly, all Enterprise Extender ports on the same connection network must use the same addressing format.