ipfw firewall help

[G Bryant]

Hi,
I found my rules worked best in this order:
(You will need to correct the syntax - just typed up the order for you 
quickly)

Deny spoofed
Allow localhost
Allow all from any to any via $iif
divert natd all from any to any in via $oif
#insert bandwidth shaping rules
skipto 5000 all from $iip to any out via $oif
#allow all from any to me in via $oif # if you want to receive traffic 
from internet to this box. Your decision if you need it.
deny all from any to any out
allow all from any to $iip in via $oif
#allow all from me to any out via $oif # traffic from this box out to 
the internet.  Your decision if you need it.
deny all from any to any in
5000 nat all from any to any out via $oif
allow all from any to any out

This is a very "open" set of rules - your choice.
Hope this helps.
Regards,  Graham


Daemon wrote:

>I'm trying to build a firewall from scratch using man ipfw and what I
>can find on the net.  I'm doing bandwidth shaping and I'm not quite sure
>where it goes as far as rule numbers.  From what I can see, it matters
>and I'd like to do it right.  I'm using an OPEN firewall with NATD
>because I'm on cable broadband with a static IP.  Here is what I have.
>
>00010   52   2446 pipe 1 ip from 172.16.140.0/24 to any xmit re0
>00020    0      0 pipe 2 ip from any to 172.16.140.0/24 recv re0
>00050  274  24955 divert 8668 ip from any to any via re0
>00100   50   5642 allow ip from any to any via lo0
>00200    0      0 deny ip from any to 127.0.0.0/8
>00300    0      0 deny ip from 127.0.0.0/8 to any
>65535 4658 547779 allow ip from any to any
>
>The actual rule set for the bandwidth shaping is:
>
># Traffic Shaping.
># oif="re0"			# ${oif} Public Interface.
># iif="re1"			# ${iif} Internal nic.
># iip="172.16.140.0/24"		# ${iip}
>
>${fwcmd} add 10 pipe 1 all from ${iip} to any xmit ${oif}
>${fwcmd} pipe 1 config mask src-ip 0xffffff00 bw 35Kbits/s queue 40Kbytes
>
>${fwcmd} add 20 pipe 2 all from any to ${iip} recv ${oif}
>${fwcmd} pipe 2 config mask dst-ip 0xffffff00 bw 4000Kbits/s queue 40Kbytes
>
>I've found lots of stuff on "how" to set it up but I can't seem to find
>anything on where the rules go.  Any help would be greatly appreciated.
>
>Regards,
>
>Mark
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