Hello,
I am running 7.1.rc2.
I suspect there is a bug in negative DNS Caching when:
There is a remote (externally accessible) CNAME that points to a local A Record.
For example:
External (globally accessible) DNS:
my.domain.com CNAME __ip.domain.com
__ip.domain.com A 1.2.3.4
Mikrotik:
__ip.domain.com A 192.168.100.50
The goal is to resolve the same domain name to either an internal IP address or an external IP address. Rather then listing out A records locally and externally, use a CNAME to point to either internal or external IP.
When I try to resolve “my.domain.com” from within the LAN, the Mikrotik router places a “negative” DNS entry, despite it being able to resolve it. Or rather, it fails to resolve an A record, but places a negative record for all DNS types.
One way to fix this is to manually place A records internally, rather then using a CNAME to an A record.