- Does openshift SDN support ivp6
No, work on ipv6 support for the SDN will not happen until OVN replaces OVS several versions from now. calico is an option for this.
- Can i only allow 53 udp not tcp for openshift cluster nodes ?
ocp uses 8053 by default from > 3.3 version. needs tcp/udp both on 8053 port, no need 53