Colleagues, This is a follow-up to the operational announcement regarding changes to the ARPA top-level domain that was sent on 2010-03-10. Apologies in advance for duplicates received through different mailing lists. As of 2010-03-17 1630 UTC all the authoritative servers for ARPA are serving a signed ARPA zone. We would like to solicit feedback from the technical community to allow us to identify any operational ill-effects that this change has caused. We will monitor this mailing list for feedback, and I will also distribute any feedback sent to me personally so that it can be considered. If no harmful effects have been identified by 2010-03-21 the trust anchor for the ARPA zone will be published through the IANA ITAR at <https://itar.iana.org/>. Regards, Joe Begin forwarded message:

From: Joe Abley <joe.abley@icann.org> Date: 10 March 2010 16:13:46 EST To: Joe Abley <joe.abley@icann.org> Subject: Signing of the ARPA zone

Colleagues,

This is a technical, operational announcement regarding changes to the ARPA top-level domain. Apologies in advance for duplicates received through different mailing lists.

No specific action is requested of operators. This message is for your information only.

The ARPA zone is about to be signed using DNSSEC. The technical parameters by which ARPA will be signed are as follows:

KSK Algorithm and Size: 2048 bit RSA KSK Rollover: every 2-5 years, scheduled rollover to follow RFC 5011 KSK Signature Algorithm: SHA-256 Validity period for signatures made with KSK: 15 days; new signatures published every 10 days ZSK Algorithm and Size: 1024 bit RSA ZSK Rollover: every 3 months ZSK Signature Algorithm: SHA-256 Authenticated proof of non-existence: NSEC Validity period for signatures made with ZSK: 7 days; zone generated and re-signed twice per day

The twelve root server operators [1] will begin to serve a signed ARPA zone instead of the (current) unsigned ARPA zone during a maintenance window which will open at 2010-03-15 0001 UTC and close at 2010-03-17 2359 UTC. Individual root server operators will carry out their maintenance at times within that window according to their own operational preference.

The trust anchor for the ARPA zone will be published in the ITAR [2], and in the root zone in the form of a DS record once the root zone is signed.

If you have any concerns or require further information, please let me know.

Regards,

Joe Abley Director DNS Operations, ICANN

[1] <http://www.root-servers.org/> [2] <https://itar.iana.org/>