BIG-IP 11.4 Behavior Change: Global Data Now Partitioned by Traffic Group
Published Jun 18, 2013
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We need to apply SNATs and floating self IPs per traffic group to make sure the servers responses will reach the right device.
If no virtual address is available for SNAT in a traffic group, the local self IP (traffic-group-local-only) will be picked for SNAT. But the servers responses to this address will be dropped now.
In the past it was possible to make use of the 'global' tables by applying mirroring to handle asymmetric traffic as a workaround. This won´t work anymore, I guess.