ns.VERNET.SU has no CNAME records.
Question and response
Question
dig ns.VERNET.SU. NS
Answer
The response has no answer records.
Authority
VERNET.SU. 2658 SOA ns.VERNET.SU. hostmaster.VERNET.SU. 2026011402 7200 1800 1209610 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0