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1 Listening on individual IPv6 interfaces does not work.

This is usually due to "/proc/net/if_inet6" not being available in the chroot file system. Mount another instance of "proc" in the chroot file system. This can be be made permanent by adding a second instance to /etc/fstab. proc /proc proc defaults 0 0 proc…

2 Why can't named update slave zone database files, slave journal files and master zones from journals?

This is a problem that has been reported when running BIND on Red Hat Enterprise Linux or Fedora Core. Specifically problems are encountered with updating slave zone database files, creating DDNS journal files and updating master zones from journals. It also…

3 I get the error message "named: capset failed: Operation not permitted" when starting named.

The capability module, part of "Linux Security Modules/LSM", has not been loaded into the kernel. See insmod(8), modprobe(8). The relevant modules can be loaded by running: modprobe commoncap modprobe capability

4 Why does BIND 9 log "permission denied" errors accessing its configuration files or zones on my Linux system?

You may see these "permission denied" errors even though named is running as root. On Linux, BIND 9 drops most of its root privileges on startup. This including the privilege to open files owned by other users. Therefore, if the server is running as root,…

5 Why do I see 5 (or more) copies of named on Linux?

Linux threads each show up as a process under ps. The approximate number of threads running is n+4, where n is the number of CPUs. Note that the amount of memory used is not cumulative; if each process is using 10M of memory, only a total of 10M is used.…

6 Why does named lock up when it attempts to connect over IPSEC tunnels?

This is due to a kernel bug where the fact that a socket is marked non-blocking is ignored. It is reported that setting xfrm_larval_drop to 1 helps but this may have negative side effects. For more information, see: https://bugzilla.redhat.com/show_bug.cgi?id=427629…

7 Why do I get the following errors: general: errno2result.c:109: unexpected error:general: unable to convert errno to isc_result

In more detail - this is what you might see: general: errno2result.c:109: unexpected error: general: unable to convert errno to isc_result: 14: Bad addressclient: UDP client handler shutting down due to fatal receive error: unexpected error It is the result…