I managed to resolve the problem.. at little.
Packets i wanted to filter:
Source: 0.0.0.0 (0.0.0.0) Destination: 255.255.255.255 (255.255.255.255) User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Firewall filter:
term allow_dhcp { from { source-address { 0.0.0.0/32; } destination-address { 255.255.255.255/32; } protocol udp; source-port 68;
If you add a destination-port 67, the packet is no longer allowed through the filter.