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So, regarding HMC and RMC …
I know HMC do not support NAT with RMC but have anyone here found a work-around for this and perhaps solved it anyway without remove NAT?https://www.ibm.com/support/pages/fixing-no-rmc-connection-error "Network Address Translation (NAT) is not supported in HMC RMC domains and NAT would need to be disabled on the network".
Just to explain about the network traffic:
LPAR can successfully send RMC 657 traffic via NAT IP address to the HMC server but the HMC respond to the actual LPAR IP address instead of NAT IP address and that is not allowed.