MRV Communications LX-4000 Series Información técnica Pagina 555

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D-24 ip6tables man Pages
LX Series Configuration Guide
of built-in chains and may also contain user-defined chains.
Each chain is a list of rules which can match a set of packets.
Each rule specifies what to do with a packet that matches. This is
called a “target”, which may be a jump to a user-defined chain in
the same table.
TARGETS
A firewall rule specifies criteria for a packet, and a target. If
the packet does not match, the next rule in the chain is the exam-
ined; 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
or one of the special values ACCEPT, DROP, QUEUE, or RETURN.
ACCEPT means to let the packet through. DROP means to drop the
packet on the floor. QUEUE means to pass the packet to userspace
(if supported by the kernel). 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 deter-
mine the fate of the packet.
TABLES
There are currently two independent tables (which tables are
present at any time depends on the kernel configuration options and
which modules are present), as nat table has not been implemented
yet.
-t, --table table
This option specifies the packet matching table which the command
should operate on. If the kernel is configured with automatic
module loading, an attempt will be made to load the appropriate
module for that table if it is not already there.
The tables are as follows: filter: This is the default table (if no
-t option is passed. It contains the built-in chains INPUT (for
packets coming into the box itself), FORWARD (for packets being
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