Iptables args

• -j RETURN : will cause the current packet top stop traveling throught the chain(or sub-chain)
• -j ACCEPT : the rule is accepted and will not continue traversing the current chain or any other ones in the same table.Note however,that a packet was accepted in one chain might still travel through chains within other tables,and could still be dropped there.
• -j DNAT : only available within PREROUTING and OUTPUT chains in the nat table,and any of the chains called upon from any of those listed chains.
• -j SNAT : valid only in nat tables,within the POSTROUTING chain.
• -j REJECT : sends a response back(unlike drop).valid in the INPUT,FORWARD and OUTPUT chains or their sub chains
• -j DROP : drops the packet,right there right then
• -j MARK : only valid in managle table. Note that the mark value is not set within the actual package,but is a value that is associated within the kernel with the packet. In other words does not make it out of the machineiptables -t mangle -A PREROUTING -p tcp –dport 22 -j MARK –set-mark 2
• -j MASQUERADE : similar to SNAT but used on a outbound network interface when the outbound IP can change. Say a DHCP interface only valid within the POSTROUTING
• -j REDIRECT : redirect packets and streams to the machine itself. Valid within the PREROUTING and OUTPUT chains of the nat tables. It is also valid within user-defined chains that are only called from those chains.

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