Concise Guide to DNS and BIND, The

The Housekeeping of BIND

BIND has a few housekeeping routines. The dial-up heartbeat-interval has already been covered in Chapter 10, "DNS and Dial-Up Connections," and the cleaning-interval was covered in Chapter 8, "Security Concerns."

Interface Scanning

Every 60 minutes BIND scans your system for new interfaces, and if it finds any, it starts listening on port 53 (TCP and UDP) on the interfaces. If your machine takes interfaces up and down often, 1 hour might be too long to wait for this. The interface-interval option can help:

options {
    …
    interface-interval 0;
    …
};

The interval is measured in minutes. If interface-interval is set to 0, as in this example, the interfaces are scanned only each time the named.conf file is read—at reload ...