Thanks Elbert for your answer.
Unfortuanetly this does not solve, what i was looking for.
My Situation:
Firewall-Adresslist: Name "VPN" contains
www.dnsleak.com
IP route and rule is to route these entries of addreelist "VPN" through my VPN -> works!
But the dns reqeusts for this entries are going to my local dns server, my router.
I just wanna let them go to a dns server on VPN site.
How am i able to identify only these dns requests? that is my problem.
If i could identify them, so i can use your firewall rules to redirect them through vpn.