The idea is that the DHCP server can update two DNS servers according to the hostname of the machines to which they assign an IP, to say if a hostname starts with "sa" it should update the DNS1 server, but if it starts with other letters will update the DNS2
So far I can make dynamic DNS work, which is updated when DHCP assigns an IP address and according to the manual with
if substring(option vendor-class-identifier,0,2)="sa"{
ddns-domainname "midominio.com.";
ddns-rev-domainname "in-addr.arpa.";
}
It could be updated in those areas of the DNS1 server but one does not, besides I have doubts about how to implement the DNS2 server in the DHCP configuration file