Description: As of z/OS V2R1 policy-based routing is enhanced to route IPv6 traffic. In earlier releases a policy-based routing rule that did not specify the source and destination IP addresses only applied to IPv4 packets. Starting in z/OS V2R1, that same policy-based routing rule applies to both IPv4 and IPv6 packets.
| Element or feature: | z/OS Communications Server. |
| When change was introduced: | z/OS V2R1. |
| Applies to migration from: | z/OS V1R13 and z/OS V1R12 |
| Timing: | Before installing z/OS V2R1. |
| Is the migration action required? | Yes, if you are using policy-based routing on a stack that is being run as a dual-mode stack (IPv4 and IPv6). |
| Target system hardware requirements: | None. |
| Target system software requirements: | None. |
| Other system (coexistence or fallback) requirements: | None. |
| Restrictions: | None. |
| System impacts: | None. |
| Related IBM Health Checker for z/OS check: | None. |
Steps to take: If you have a policy-based routing rule that specifies neither source IP addresses nor destination IP addresses, the rule will apply to both IPv4 and IPv6 packets. If you want the rule to continue to apply to only IPv4 packets, modify the rule to specify either a source or destination IP address of 0.0.0.0/0.
Reference information: See the RoutingRule statement in z/OS V2R1.0 Communications Server: IP Configuration Reference