ISSUES

• A6 DNAME/PTR referrals can cause overwhelming dns-traffic.

  In theory, 127 referrals are possible and every refered NS can have an aggregatable address again.

• A6 DNAME/PTR referrals can cause lookup loop.

  (A refers to B refers to C refers to A) DoS attack.

• Signing of A6 records means aggregated addresses can be partially signed.