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# See #NS
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# = Name Server Record (NS)
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#
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# Defined in RFC 1035. NS RRs appear in two places. Within the zone file, in
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# which case they are authoritative records for the zone's name servers. At the
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# point of delegation for either a subdomain of the zone or in the zone's
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# parent. Thus the zone example.com's parent zone (.com) will contain
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# non-authoritative NS RRs for the zone example.com at its point of delegation
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# and subdomain.example.com will have non-authoritative NS RSS in the zone
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# example.com at its point of delegation. NS RRs at the point of delegation are
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# never authoritative only NS RRs for the zone are regarded as authoritative.
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# While this may look a fairly trivial point, is has important implications for
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# DNSSEC.
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#
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# NS RRs are required because DNS queries respond with an authority section
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# listing all the authoritative name servers, for sub-domains or queries to the
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# zones parent where they are required to allow referral to take place.
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#
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# Obtained from http://www.zytrax.com/books/dns/ch8/ns.html
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#
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class NS < Record
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validates :content, :presence => true, :hostname => true, :inclusion => {:in => Settings.ns}
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def to_label; "#{content}" end
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end
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Ns = NS
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