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Assessment Title
Rule Text
In a split DNS configuration, where separate DNS service members are used between the external and internal networks, the internal DNS service member must be configured to not be reachable from outside resolvers.
Description
Discussion Text
Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two different sets of authoritative name servers.
One set, called external name servers, can be located within a DMZ; these would be the only name servers accessible to external clients and would serve resource records (RRs) pertaining to hosts with public services (web servers that serve external web pages or provide B2C services, mail servers, etc.)
The other set, called internal name servers, is to be located within the firewall and should be configured so it is not reachable from outside and hence provides naming services exclusively to internal clients.
One set, called external name servers, can be located within a DMZ; these would be the only name servers accessible to external clients and would serve resource records (RRs) pertaining to hosts with public services (web servers that serve external web pages or provide B2C services, mail servers, etc.)
The other set, called internal name servers, is to be located within the firewall and should be configured so it is not reachable from outside and hence provides naming services exclusively to internal clients.
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