Miscellaneous
Bind 4 has some additional features. The following sections describe them.
Debugging
Starting named with the -d command-line option or running ndc debug turns on debugging output. If you don't have ndc, sending SIGUSR1 to increment the debug level also accomplishes this. By default, this is written to /usr/tmp/named.run. This in addition to, or in place of, query logging can help you figure out whether someone is sending you bogus information or bombarding you with queries, slowing down your system. However, using just query logging might be sufficient. Sending SIGUSR2 disables debugging.
Sending SIGINT to named is analogous to the ndc dumpdb command. It dumps the entire database and cache contents to a file, probably called ...
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