30.12. Configuring Forwarding and Transfers
BIND can be configured to forward all requests for zones that it is not the master or slave for to another DNS server. When doing this, it acts like a DNS client itself, accepting requests from real clients and then sending them off to another server or servers for resolution instead of carrying out the normal process of contacting the root zone servers and finding the correct server for the domain. This can be useful if your DNS server is unable to contact the rest of the Internet, but can still communicate with a DNS server that does have full network access. For example, it may be on an internal network behind a firewall that only allows connections to a limited set of destinations.
To set up forwarding, ...
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