We have two geographically separate HA networks. Ea with 3 2012 hosts and multiple guest VMs. We recently had to disable TCP and UDP checksum offload on one host and the Exchange VM sitting on that host to allow our DAG's to communicate. This fixed our issue but, we are unsure if it was the settings on the Host or the guests that worked. Rather than go test further on our production network I want to know if anyone can confirm with technical documentation that we need to disable TCP/UDP checksum on the applicable host NICS only? OR, disable on both hosts NICs and guest VM virtual NICs?
Thank you