Hello, Rod - It is important to consider the TTL on the glue records at Educause/Verisign. The EDU. root sets TTLs for each NS/A/AAAA record for two days.
I recommend operating authoritative DNS servers at the old IP addresses for four days after the EDU. and IASTATE.EDU. zone updates. In practice, we have encountered caching resolvers that provide non-decrementing TTL values to downstream resolvers and clients. Even if a misbehaving resolver expires its cache at the two-day mark, some of its clients are likely to retain the old records for an additional two days. Mitchell Kuch Application Programmer/Analyst Merit Network, Inc. mdk...@merit.edu | +1.734.527.5748 1000 Oakbrook Drive, Suite 200 | Ann Arbor, MI 48104 ----- Original Message ----- From: "Eldridge, Rod A [ITNET]" <r...@iastate.edu> To: bind-users@lists.isc.org Sent: Thursday, February 23, 2017 2:52:35 PM Subject: switching entire DNS system to new servers and IP addresses Iowa State University is replacing 7 ISC NAMED/BIND servers and 4 ISC DHCP servers with Infoblox servers on March 14th. We want to keep the domain names of our external servers the same (with one exception), but we will be changing all of the IPv4 and IPv6 addresses of those external servers. Current external name servers: DNS-1.IASTATE.EDU 129.186.6.249, 2610:130:101:100::249 DNS-2.IASTATE.EDU 129.186.88.249, 2610:130:102:e01::249 ISU.DNS.NORTHERNLIGHTS.GIGAPOP.NET 146.57.253.249, 2607:ea00:1:9::aa The exception is that we will be removing ISU.DNS.NORTHERNLIGHTS.GIGAPOP.NET (a server located at the UMN) and will be installing a server at UIowa (that will be named DNS-3.IASTATE.EDU). The new IPv4 addresses for the new external name servers will be: DNS-1.IASTATE.EDU 129.186.67.129 DNS-2.IASTATE.EDU 129.186.67.145 DNS-3.IASTATE.EDU 128.255.x.x <== not yet assigned We haven't assigned IPv6 addresses yet. We'd like advice about any issues or problems we might run into and to watch out for, what preparations should we do or must we do before the switch, and any other advice to help us make this switch go smoothly and unnoticed. Thank you. -- Rod Eldridge Networks & Communications IT Services, Iowa State University of Science and Technology _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
