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iptables et protocole

i've read a few books on iptables and these says :
you can specify the protocol with --protocol and you have the choice between tcp, icmp, udp or all ... ok
but i have to specify --protocol ip or --protocol gre (because i'm parsing cisco rules in iptables firewall)
 can I ?
futhermore is there a really difference between these 2 lines :
iptables -A FORWARD -p ip -src -j accept
iptables -A FORWARD  -src -j accept

that's all :)

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