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I have no problem with the rule, the rule catches it fine. iptables is just incapable of blocking the traffic dhcpd is sending and receiving.
You have todo a little searching because people tend to give advice about stuff they havent actually played with before, but, lol. Its my understanding iptables cannot effect the raw sockets dhcpd is using for communcation.
I had an old firewall rule in place from a prior experiment set to block all dhcp traffic, didnt realize it and the counters were up to like 300.. of course it never stopped a shred of dhcp traffic the rest of my network worked fine, lol. After I did a little research i figured I would chime in, and also to find out if whatever supposed module iptables is using to replace ebtables functionality, if it would actually work in this case.