Thanks for looking at..
1. oVirt engine and node running on different machines but on the same network
2. Logical network settings at engine side, enabled VM network, no VLAN tagging, default
MTU (1500), Host Network QoS (unlimited), no DNS configuration.
3. vNIC profile all are defaults and Network Filer is No Network Filter
4. VM network settings, Type set to virtIO and no Network Filter parameters
Does this make sense ? Else please let me know what else you exactly want.