adding IPv6 NSs with AAAA RR

Adding glue for NSs that today have AAAA

Get all IPv6 enabled nameservers:
ask all TLDs what their nameservers are
see if those nameservers have a AAAA RR

Result:
39 nameservers have a AAAA RR

Add those 39 AAAAs as glue to the root zone:
replay DNS root queries in lab
count # of answers with dropped glue