It seems like something that would be easy, just NAT ipv4 traffic to IPv6 for our network. Can you link to any resources on these difficulties?
"Not every type of resource is accessible with NAT64. Protocols that embed IPv4 literal addresses, such as SIP and SDP, FTP, WebSocket, Skype, MSN, and any other content with IPv4 literals are excluded"
"There are two noticeable issues with this transition mechanism:
It only works for cases where DNS is used to find the remote host
address, if IPv4 literals are used the DNS64 server will never be
involved.
Because the DNS64 server needs to return records not specified by the domain owner, DNSSEC validation against the root will fail in cases where the DNS server doing the translation is not the domain owner's server. "