nat rules problem

[keropiko]

Hi,

i have many firewall rules with FQDN as aliases.
The problem i have noticed, is that many times i have rebooted the system,
the configuring dynamic dns clients take took long after that  the ntp service gets deffered and although the system get ip from PPPOE the nat rules are not loading and internet not working correctly.
Could this be a DNS issue? i am using unbound as DNS and have not set up DNS at the general settings per interface.
Is it possible to deffer the dynamic dns service after unbound service and after pppoe gets ip so rules gets loaded?