C-M-G
Series
Manual
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Chapter 5: Network Configuration
Seite 56 von 136
Note
IPtables works top-down.
Rules (e.g. Destination NAT) which are defined in section »Pakets before routing
(PREROUTING)«
are
processed
immed
itally
and
aren’t
passed
over
to
chain »Incoming packets (INPUT)« or other following chains.
5.9.3 Targets
Each single chain include rules, comprises the filter specification and a target. The target defines how to
handle the packet. Targets are a user defined chain, a default target or an extendet target. For fixed
chains a policy can be defined which will be applied if no rule matches. A policy is always equal to a
default target. A general survey is located in table
listed in
Default target is
ACCEPT
.
Figure 19: Flow diagram
– Default Policy Drop btw. Accept
5.9.4 Linux Firewall Menu
The first time you open this menu and no firewall settings have been done yet, a form for basic settings
will be shown.
Once these settings are defined, the following menu will be shown.
