DNS auto IP switch

The program/script must automatically switch the current IP in the DNS zone file to the next backup when the current IP's index fails a keyword comparison. The program/script will then send me an email to make me aware of the IP change. The DNS server is using BIND. I have multiple domains (50+) that utilize the same zone file. The script will be change the IP for all domains. I will need an easy way to add/remove IP's for use by the script. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform B.I.N.D.