Apex domains cannot have CNAME records.
Question and response
Question
dig dynamic.eatel.net. NS
Answer
dynamic.eatel.net. 5 NS ns9.eatel.net.
dynamic.eatel.net. 5 NS ns8.eatel.net.
Authority
The response has no authority records.
Additional
ns8.eatel.net. 5 A 206.124.203.250
ns9.eatel.net. 5 A 34.202.250.148
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0