look at this example, i can asure you it's working, is a modification made to the default /etc/rc.firewall :
Code:
[Ss][Ii][Mm][Pp][Ll][Ee])
############
# This is a prototype setup for a simple firewall. Configure this
# machine as a named server and ntp server, and point all the machines
# on the inside at this machine for those services.
############
dont_deny="my_very_best_friend"
# set these to your outside interface network and netmask and ip
oif="rl1"
onet="outside_net_address"
omask="255.255.255.240"
oip="outside_ip_addr"
# set these to your inside interface network and netmask and ip
iif="rl0"
inet="internal_net_address"
imask="255.255.255.0"
iip="internal_ip"
# Stop spoofing
${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${onet}:${omask} 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}
# 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 ${oif}
######### RULES BEFORE NAT ######################
# Allow access for iserver
#${fwcmd} add pass tcp from 192.168.10.10 to any out setup
# Allow access for SIMM-3
#${fwcmd} add pass tcp from 192.168.10.20 to any out setup
# Deny everything else
#${fwcmd} add deny all from 192.168.0.0/24 to any setup
#
#######################################################################
# 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
# address set to 192.0.2.1 then an incoming packet for it after being
# translated by natd(8) would match the `deny' rule above. Similarly
# an outgoing packet originated from it before being translated would
# match the `deny' rule below.
case ${natd_enable} in
[Yy][Ee][Ss])
if [ -n "${natd_interface}" ]; then
${fwcmd} add divert natd all from any to any via ${natd_interface}
fi
;;
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}
# 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}
#### RULES AFTER NAT ##########################
${fwcmd} add pass tcp from any to me 113
${fwcmd} add pass tcp from me 113 to any
# ${fwcmd} add pass tcp from me to any via ${iif} keep-state
##################################################################
# Don't deny address[es]
${fwcmd} add pass all from ${dont_deny} to any
${fwcmd} add pass all from any to ${dont_deny}
# Allow TCP through if setup succeeded
${fwcmd} add pass tcp from any to any established
# Allow IP fragments to pass through
${fwcmd} add pass all from any to any frag
# Allow setup of incoming email
${fwcmd} add pass tcp from any to ${oip} 25 setup
# Allow access to our DNS
${fwcmd} add pass tcp from any to ${oip} 53 setup
${fwcmd} add pass udp from any to ${oip} 53
${fwcmd} add pass udp from ${oip} 53 to any
# Allow access to our WWW
${fwcmd} add pass tcp from any to ${oip} 80 setup
# Allow access to Webmin
${fwcmd} add pass tcp from any to ${oip} 3129 setup
# SSH
${fwcmd} add pass tcp from any to ${oip} 22 setup
# FTP
${fwcmd} add pass tcp from any to ${oip} 21 setup
# FTP-data
${fwcmd} add pass tcp from any to ${oip} 20 setup
# SMTP
${fwcmd} add pass tcp from any to ${oip} 25 setup
# POP3
${fwcmd} add pass tcp from any to ${oip} 110 setup
# Reject&Log all setup of incoming connections from the outside
${fwcmd} add deny log tcp from any to any in via ${oif} setup
# Allow setup of any other TCP connection
${fwcmd} add pass tcp from any to any setup
# Allow DNS queries out in the world
${fwcmd} add pass udp from ${oip} to any 53 keep-state
# Allow NTP queries out in the world
${fwcmd} add pass udp from ${oip} to any 123 keep-state
# Everything else is denied by default, unless the
# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
# config file.
;;
hi
i got a problem. I use a fbsd box to share my (DSL)internet connection.
I got 2 networkcards in my fbsd box, but my networkcard 1 (to my modem) always go out. the led don't burn anymore and I lose my connection to the internet :(
but my networkcard2 (to my local network) doesn't go out,... (2 Replies)
HI
i'm compiling my kernel with the support of this chipset.
In FreeBSD 4.2 and 4.3 I got no problem with the kernel, but with 4.4 I just can't get the kernel compiled with the soundcard support.
i added this to my kernel
device pcm
device snd
something wrong... (2 Replies)
FBSD 4.6
How do I colorize my konsole to see directories etc. Am able to get color in the shell with ls -GF in my .bashrc. But color does not show in KDE3 Konsole (Xwindows) for some reason.FBSD 4.6 (1 Reply)
Is there a general rule I can apply when examining/editing ipfw entries?
Also, does each new entry have to have a unique rule number?
And, I think I can write a script to block code red infected machines (though I'm not sure it would do more than slim down my web server error message log),... (0 Replies)
Hi folks,
I am a Mac User, and have little knowledge on IPFW.
I have a set up at home where my computer (with 2 ethernet cards and static IP adresses) serves Internet to my family's computers.
I have already a script that will run automatically at login and called from Cron at certain... (2 Replies)
I'm trying to establish a jail on a FBSD 6.1 system and have a couple of questions on bringing up the daemon.
Under the jail man page there are two user flags that I am unclear on,
-u username The user name from host environment as whom the command
should run.
-U... (1 Reply)
Hi!
I've already posted this on the freebsd-questions mailing list, but I thought I could try it here too.
I'm using FreeBSD 7.0 with IPFW DUMMYNET enabled.
I've got a problem with creating a ruleset, which allows me to limit the overall bandwidth of a link and afterwards pass the packets... (0 Replies)
Hello,
I have a little problem with my server configuration.
So: I have two PC's with DHCP enable and both of them have two NIC's.
PC1 - le0 ADSL
PC1 - le1 192.168.10.1
PC2 - le0 192.168.10.10
PC2 - le1 192.168.20.1
One NIC on PC1 is connected to ADSL, another one have IP address... (3 Replies)
Under Mountain Lion, I want logs from ipfw sent to ipfw.log instead of dumped in system.log I've tried to figure out how OSX handles logs, but... after going back and forth between a syslog.conf which does little if anything, a newsyslog.conf that seems to only handle rotation, an asl.conf that... (3 Replies)