iptables -A INPUT -i eth1:1 -m pkttype --pkt-type multicast -j ACCEPT
Certifique-se de que o módulo xt_pkttype
esteja carregado no kernel em execução:
--- Networking support
Networking options --->
[*] Network packet filtering framework (Netfilter) --->
Core Netfilter Configuration --->
<*> "pkttype" packet type match support