Date: Thu, 13 Nov 2008 17:50:07 -0800 From: Julian Elischer <julian@elischer.org> To: FreeBSD Net <freebsd-net@freebsd.org>, ipfw@freebsd.org Subject: rc.firewall quick change Message-ID: <491CD94F.3020207@elischer.org>
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At home I use the following change.
basically, instead of doing 8 rules before and after the nat,
use a table and to 1 rule on each side.
any objections?
(warning, cut-n-paste patch.. will not apply)
Index: rc.firewall
===================================================================
--- rc.firewall (revision 184948)
+++ rc.firewall (working copy)
@@ -231,19 +231,24 @@
${fwcmd} add deny all from ${onet} to any in via ${iif}
# Stop RFC1918 nets on the outside interface
- ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
- ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
- ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}
+ ${fwcmd} table 1 add 10.0.0.0/8
+ ${fwcmd} table 1 add 172.16.0.0/12
+ ${fwcmd} table 1 add 192.168.0.0/16
# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes
RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and
class E)
# on the outside interface
- ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
- ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
- ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
- ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
- ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}
+ ${fwcmd} table 1 add 0.0.0.0/8
+ ${fwcmd} table 1 add 169.254.0.0/16
+ ${fwcmd} table 1 add 192.0.2.0/24
+ ${fwcmd} table 1 add 224.0.0.0/4
+ ${fwcmd} table 1 add 240.0.0.0/4
+ # Stop the above nets with the table
+
+ ${fwcmd} add deny all from any to "table(1)" via ${oif}
+
+
# Network Address Translation. This rule is placed here
deliberately
# so that it does not interfere with the surrounding
address-checking
# rules. If for example one of your internal LAN machines
had its IP
@@ -260,19 +265,8 @@
esac
# Stop RFC1918 nets on the outside interface
- ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif}
- ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif}
- ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}
+ ${fwcmd} add deny all from "table(1)" to any via ${oif}
- # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes
RESERVED-1,
- # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and
class E)
- # on the outside interface
- ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
- ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
- ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
- ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
- ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}
-
# Allow TCP through if setup succeeded
${fwcmd} add pass tcp from any to any established
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