DNS for a subdomain

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http://serverfault.com – I have: - two DNS servers: and - domain name: domain.com pointed to I want to point sub domain: sub.domain.com to (obviously www.sub.domain.com too) on I've create a DNS A record pointing sub.domain.com to accessing sub.domain.com now lead to successfully the problem is the DNS records on such as CNAME www do not work means accessing www.sub.domain.com DNS lookup results to: domain does not exist. what should I do in order to be sure that all sub.domain.com sub-domains and alias are managed by Your help is appreciat (HowTos)