On wireshark we can see:
SrcAddr: ::
DstAddr: ::
ipv6FlowLabel: 0
IPv6 Extension Headers: 0x00000000
And the NFA report show:
Host Summary - Volume (::)
Using the same device flow configuration in NFA 9.3.6 (build122) we can see the the report and IP's in Host Summary
Now in NFA 10.0.1 (build41) we cannot see the IP's in Host Summary, show only (::)
Release : 10.0
With 9.5.0 we have added support for IPv6. So if the traffic contains only IPv4 we will show IPv4 and if it contains IPv6 we will show IPv6.
But if we have both IPv4 and IPv6, then IPv6 will take the precedence which is the case here.
Behaviour in versions prior to 9.5.0:
NetFlow Packet Contents Graphs
Only IPv4 show IPv4
Only IPv6 show No Data
Both IPv4 and IPv6 show only IPv4
Behaviour in versions after 9.5.0:
NetFlow Packet Contents Graphs
Only IPv4 show IPv4
Only IPv6 show IPv6
Both IPv4 and IPv6 show IPv6 that has the preference
Due to this, you will see only :: in version after 9.5.0 because the IPv6 address is configured as :: in the router.