Greetings all,
I’m trying to create an entry in the static dns cache for the special name ‘ipv4only.arpa’. The entry needs to resolve to two v4 and two v6 addresses (RFC https://www.rfc-editor.org/rfc/rfc8880.html, Appendix B). I executed the required command to create this entry which seemingly succeeded (no error messages on the console) but in both cases each resulting entry resolved to just one address (the first one).
The test results are as follows:
Name resolution results against ISP
(no entry in routeros dns cache, ISP does not report AAAA records either, as expected):
**PS > Resolve-DnsName ipv4only.arpa
Name Type TTL Section IPAddress
ipv4only.arpa A 49750 Answer 192.0.0.171
ipv4only.arpa A 49750 Answer 192.0.0.170**
I now execute these commands (RouterOS v 7.11.2):
/ip/dns/static
add name=“ipv4only.arpa” address=192.0.0.170 address=192.0.0.171
add name=“ipv4only.arpa” address=64:ff9b::192.0.0.170 address=64:ff9b::192.0.0.170 type=AAAA
(Specifying the addresses as a comma separated list results in an error. The above versions worked, i.e. no error output on the console)
What I get after the running the commands:
**PS > Resolve-DnsName ipv4only.arpa
Name Type TTL Section IPAddress
ipv4only.arpa AAAA 86400 Answer 64:ff9b::c000:aa
ipv4only.arpa A 86400 Answer 192.0.0.170**
What I was really expecting was 4 address rows, 2 for IPv6 and 2 for IPv4.
What am I doing wrong and/or how do I create a static entry that resolves to all 4 addresses specified in RFC 8080? OTOH, if my understanding is fundamentally incorrect, I’d really appreciate it if you folks could set me straight! 
Tia
dnz