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What is return target in iptables?
11.15. RETURN target. The RETURN target will cause the current packet to stop traveling through the chain where it hit the rule. If it is the subchain of another chain, the packet will continue to travel through the superior chains as if nothing had happened.
What flag when creating an iptables rule enables the admin to initialize the packet and byte counters of a rule?
When the “!” argument precedes the “-f” flag, the rule will only match head fragments, or unfragmented packets. This enables the administrator to initialize the packet and byte counters of a rule (during INSERT, APPEND, REPLACE operations).
What does return mean in an iptables chain?
RETURN means stop traversing this chain and resume at the next rule in the previous (calling) chain. If the end of a built-in chain is reached or a rule in a built-in chain with target RETURN is matched, the target specified by the chain policy determines the fate of the packet.
What happens if packet does not match in iptables?
If the packet does not match, the next rule in the chain is examined; if it does match, then the next rule is specified by the value of the target, which can be the name of a user-defined chain, one of the targets described in iptables-extensions (8), or one of the special values ACCEPT, DROP or RETURN . ACCEPT means to let the packet through.
What are the options used in the iptables command?
Options Used within iptablesCommands Rules for filtering packets are put in place using the iptablescommand. The following aspects of the packet are most often used as criteria: Packet Type— Specifies the type of packets the command filters.
What happens if I add a rule to iptables?
The following parameters make up a rule specification (as used in the add, delete, insert, replace and append commands). This option has no effect in iptables and iptables-restore. If a rule using the -4 option is inserted with (and only with) ip6tables-restore, it will be silently ignored.