Hello World!
We have a strange problem with a customer for which we provide secondary DNS services.
He uses a Microsoft DNS Server.
According to the RFC I found, the underscore character is only valid in SRV Records. In any other records, this is an invalid character.
Our Customers ADS Server keeps autocreating one records like this:
gc._msdcs.web.EXAMPLE.COM 1800 IN A 192.0.2.44
Bind refuses to accept zone transfers from his server and eventualy the zone expires on the secondary. Then the customer deletes the RR, the transfer is successfull, but shortly afterwards the mentioned A record with underscore is re-created by the ADS and the problem is back.
Is this some kind of MS DNS bug, or have the DNS RFCs been updated recently to also allow underscores in other RR and some non bleading edge versions of bind still use the check from previous rfc?
Benoit Panizzon