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Barbwire
Industrial strength firewall
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This is the place that we actually take action against packets
and look at what they contain and DROP or
ACCEPT them, depending on their payload.
The filter table should be used for filtering packets generally.
For example, we could DROP, LOG,
ACCEPT or REJECT packets
without problems as in the other tables. There are three chain
built in to this table.
The first one is named FORWARD and is used on all non-locally
generated packets that are not destined for our localhost
(the firewall, in other words).
INPUT is used on all packets that are destined
for our local host (the firewall) and OUTPUT
is finally used for all locally generated packets.
The nat table is used mainly for Network Address Translation.
. The PREROUTING chain is used to alter packets
as soon as they get in to the firewall.
The OUTPUT chain is used for altering locally
generated packets (ie, on the firewall) before they get to
the routing decision.
Finally we have the POSTROUTING chain which
is used to alter packets just as they are about to leave the
firewall.
This table is used mainly for mangling packets. We could change
different packets and how their headers look among other things.
The table consists of two built in chains, the PREROUTING
and OUTPUT chains.
PREROUTING is used for altering packets just
as they enter the firewall and before they hit the routing
decision. OUTPUT is used for changing and
altering locally generated packets before they enter the routing
decision. Note that mangle can not be used for any kind of
Network Address Translation or Masquerading, the nat table
was made for these kinds of operations.
Here is an example of what can be done with barbwire.
For instance, 24.226.215.66 pings(ICMP) 24.226.215.67, you
have two options that you can do on the firewall. Either you
configure it to DROP that packet, which in
this case no message will be returned to the requester or
you can REJECT the request, which in this
case the requester will have a network unreachable response.
In both of the cases above, the request will do only one hop(1,
see fig. 1.0).
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