isc-dhcp: detect whether ddns transfers are IPv4 only #18061
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If named is configured to not listen on any IPv6 interfaces, then we should run 'nsupdate' with the '-4' argument. Also: * cleanup RFC-1918 address detection; * don't generate PTR records for domain entries that aren't RFC-1918 addresses or these will generate NOTAUTH failures; We're assuming that we're doing DNS split-horizon and that internal addresses aren't routable. Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
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Maintainer: me
Compile tested: x86_64, generic, HEAD (236c3ea)
Run tested: same, installed on production router
Description:
If named is configured to not listen on any IPv6 interfaces,
then we should run 'nsupdate' with the '-4' argument.
Also:
RFC-1918 addresses or these will generate NOTAUTH failures;
We're assuming that we're doing DNS split-horizon and that
internal addresses aren't routable.