DHCP-Daemon bypasses Linux iptables

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Hello all,
I was seriously puzzled why iptables could not stop dhcp requests from reaching ISC dhcpd. Now I found the reason: instead of listening on a UDP socket dhcpd installs a LPF similar to tcpdump or ethereal. This bypasses the protection from the firewall. What can I do to regain that protection?
 
--  Regards 
       Joerg 






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