multiport needs `-p tcp', `-p udp' - Why?

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In order to get to the chain, the protocol, as well as the interface must match. PRE_UDP if already filtered for "-p udp" . So why does multiport require another check for -p udp? Does it really need to have that option in order for it to work?

+ /sbin/iptables -t filter -N PRE_UDP
+ /sbin/iptables -t filter -A INPUT -i eth1 -p udp -j PRE_UDP
+ /sbin/iptables -t filter -A PRE_UDP -m multiport --dport 137,138,139,512,514,515,1433,1434 -j DROP
iptables v1.4.5: multiport needs `-p tcp', `-p udp', `-p udplite', `-p sctp' or `-p dccp'
Try `iptables -h' or 'iptables --help' for more information.



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