Hello,
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:
drop
not ethertype ipv4
and not ethertype arp
and not ethertype ipv6
dport 67
dport 68