As of today, the transition announced in the previous post (Authoritative DNS Improvements) is complete: dns3.illinois.edu has replaced dns1.iu.edu as our off-site authoritative nameserver (in case of an Urbana campus outage), and our authoritative zones have been removed from dns1.iu.edu.
dns1.illinois.edu was assigned an IPv6 address on 4/9, as previously announced. However, dns2.illinois.edu and dns3.illinois.edu will remain IPv4-only for the time being; we will post again when we are ready to enable their IPv6 addresses.