Date: Sun, 23 Oct 2005 18:46:56 +0200 From: G Bryant <gbryant@roamingsolutions.net> To: Daemon <daemon@foxchat.net> Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw firewall help Message-ID: <435BBE80.7040009@roamingsolutions.net> In-Reply-To: <4358FCE7.5040803@foxchat.net> References: <435849B9.8040509@foxchat.net> <4358899F.1090505@roamingsolutions.net> <4358FCE7.5040803@foxchat.net>
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Yup - that would work.
IPFW also has a built-in command that does the same:
$cmd deny ip from any to any not antispoof in
Daemon wrote:
Great!. Thanks. One possibly stupid question. What is the "Deny
Spoof"? Is that like;
# Stop spoofing of your internal network range
# ${fwcmd} add deny ip from ${iif} to any in via ${oif}
# Stop spoofing from inside your private ip range
# ${fwcmd} add deny ip from not ${iif} to any in via ${iif}
G Bryant wrote:
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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