Currently we log an exception if the stack is IPv6, but we run into IPv4 addresses, such as 192.168.1.5. However, even if the stack is IPv6, IPv4-defined addresses like 192.168.1.5 will get mapped to IPv4 mapped addresses in IPv6, so this should be allowed !

However, class D (multicast) addresses cannot be mapped to IPv6 addresses automatically, so we should still throw an exception here.

So 192.168.1.5 should be valid for both IPv4 and IPv6 stacks !

Invalid combinations include:

• IPv6 addresses (regular or multicast) with an IPv4 stack
• IPv4 class D (multicast) addresses with an IPv6 stack

Adjust the logic accordingly