DHCP Filtering via routing rules not working


I think perhaps I am going mad. Based on a very weird network arrangement I need to filter out DHCP requests and responses in zerotier flowrules. I thought I had it solved with the following but it doesn’t seem to be filtering the DHCP requests.

Flow rules in play are:

not ethertype ipv4
and not ethertype arp
and not ethertype ipv6
dport 67
dport 68

Resolved by adding DHCP fallback ports.

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