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Message: [QUOTE="Wensi Peng, post: 4464507"] Hello: Two questions: Current situation in the domain "mycompay.ca" of win2k3 domain: All windows servers and XPs point to two UNIX DNS servers. The UNIX DNS servers own "mycompany.com" for legacy hosts and have stub zone transfer configured for "mycompany.ca" for windows clients. The UNIX DNS servers request "mycompay.ca" zone transfer from one single Win2K3 root DNS, expired interval on the Win2K3 DNS is 1 day. Potential problem: single point failure if the W2k3 DNS server fails. Suggested solution: (1) add one more Win2K3 root DNS server into Unix DNS stub zone. (2) Increase the expired interval from 1 day to e.g. 3 or 7 days. Does it will affect any replication on the root domain and its child domains? My root domain "mycompany.ca" is a place holder.It have child domains. Should the two solutions solve the problem? Thanks, Wensi [/QUOTE]