As a result of the single authentication for dual stack IPoE sessions, DNS and NBNS name servers for both IPv4 and IPv6 should be provided irrespective of the IP stack that triggers the authentication or re-authentication.
The result of a Python alc.dtc.setESM() or alc.esm.set() to set the DNS or NBNS name servers is ignored when the IPoE session is not re-authenticated.