#1: It only allows me to add one ns01.domain.nl DNS with only 1 IP adress. I am not able to create 2 it ask me for a second IPV4 IP adress.. i tried using the same IP adress like in ns01 and i get an error:
Sounds like you'll need to assign a different IP to ns02.domain.nl. If you have one on your server, use that, or get one from your datacenter.
#2: I changed in Basic WHM to ns01.domain.nl now currently i have ns01.domain.nl, ns02.transip.nl, ns03.transip.nl but i am not allowed to change these at transIP What am i doing wrong?
You should have this set to just ns01.domain.nl and ns02.domain.nl. You don't want to use any of the transip.nl nameservers as those aren't compatible with cPanel.
Yes i have seen the link thanks
What do you mean by:
I can't resolve ns01.domain.nl which means that it isn't set up properly yet?
Domain name resolution is the process of tracking a domain name to an IP address. In this case, there's no record at transip.nl which defines ns01.domain.nl as an alias for 149.210.xxx.xxx. Until you create this record at transip.nl for the nameserver, no one will be able to contact ns01.domain.nl so your nameserver won't work.
I use ping to see if a domain name resolves:
$ ping ns01.domain.nl
ping: cannot resolve ns01.domain.nl: Unknown host
Now, it seems that you've set up things at transip.nl to point to ns0.domain.nl rather than ns01.domain.nl. You'll need to make sure that both cPanel and transip are set to the same thing.
$ whois domain.nl
Domain name: domain.nl
Internationale Domeinregistratie Nederland
The way DNS works is that a browser checks with transip (your registrar) to see the nameservers for domain.nl if they don't know what they are. Then, it checks with the nameserver to find the IP address of the website and any subdomains. So, in this case, they will check with transip and see that ns0.domain.nl is the primary nameserver. Since ns0.domain.nl doesn't exist, no one will get to your domain.
Now, you need to both change that to ns01.domain.nl and also set up a nameserver record at transip for ns01.domain.nl because transip stores the record that says ns01.domain.nl=149.210.xxx.xxx. You will need to contact transip for help in setting up the nameserver record if you need assistance with that.