How does terminal single-stack authentication carry both Ipv4 and ipv6 addresses?
Portal authentication, single-stack authentication carrying dual-stack
addresses: requires separate configuration of portal dual-ip enable, and
server-side support for recognition. The addresses will be brought from the
billing message. portal dual-ip enable command is used to enable the
function of carrying both IPv4 and IPv6 addresses for remote Portal
authentication of single-stack users. When enabled, if the terminal gets two
addresses, it carries two, and if it does not get two, it carries one.