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Verisign Publishes Last Part Of Series On Possible Domain Collision: “SLD Blocking Is Too Risky Without TLD Rollback”

Posted on the 21 November 2013 by Worldwide @thedomains

Verisign Published its final part of its 4 part series on domain collision and the new gTLD program entitled  “SLD Blocking Is Too Risky Without TLD Rollback”on the final day of the ICANN Meeting in Argentina.

Here it is:

“ICANN’s second level domain (SLD) blocking proposal includes a provision that a party may demonstrate that an SLD not in the initial sample set could cause “severe harm,” and that SLD can potentially be blocked for a certain period of time.

The extent to which that provision would need to be exercised remains to be determined.  However, given the concerns outlined in Part 2 and Part 3 of this series, it seems likely that there could be many additions (and deletions!) from the blocked list given the lack of correlation between the DITL data and actual at-risk queries.

If the accumulated risk from non-blocked SLDs were to become too large, it could become necessary for ICANN to withdraw the entire gTLD from the global DNS root.

Changes to the DNS root, once properly approved and authorized, can be implemented rapidly by updating the root zone file and notifying root server operators that a new zone file is available.

This part of the process is as straightforward for deletions as for additions.

The approval and authorization process, however, would need to be much faster for a deletion than it currently is for an addition because of the urgency of making the change or “rollback” after a determination was reached that a gTLD’s delegation needed to be revoked.  The importance of rapid delegation is affirmed in Recommendation 3 of SAC062:  Advisory Concerning the Mitigation of Name Collision Risk, published Nov. 7 by ICANN’s Security and Stability Advisory Committee (SSAC):

Recommendation 3: ICANN should explicitly consider under what circumstances un-delegation of a TLD is the appropriate mitigation for a security or stability issue. In the case where a TLD has an established namespace, ICANN should clearly identify why the risk and harm of the TLD remaining in the root zone is greater than the risk and harm of removing a viable and in-use namespace from the DNS. Finally, ICANN should work in consultation with the community, in particular the root zone management partners, to create additional processes or update existing processes to accommodate the potential need for rapid reversal of the delegation of a TLD.

For similar reasons, the DNS resource record TTLs for a new gTLD needs to be managed carefully to minimize residual effects that may occur should a problematic TLD delegation be removed.…


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