New answers tagged dhcpd
DHCPD is not pushing updates to BIND because it does not know what DNS name to update since no DDNS hostname is defined.
You are not detailing your OS so I'm assuming Linux. dhcpd does not appear to have an option or parameter for customizing the ddns server port, at least it's not in any man page I have seen. An option therefore could be to use iptables (or whatever firewall you have) to rewrite outbound packets to your dns server udp/53 or tcp/53, to the port it is really ...
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