Date: Fri, 15 Dec 2000 15:31:13 -0700 From: "Carlos Andrade" <carlos@rjstech.com> To: <freebsd-ipfw@FreeBSD.ORG> Subject: right Message-ID: <000801c066e6$bb7e4620$fa01a8c0@rjstech.com>
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[-- Attachment #1 --] So the email list found some typo's (which is good, the typos bad). And I have my machine on a crossover cable, life is peachy right? wrong... for some reason I cannot get dns to work. I can send email and receive email since I was able to hobble the ip's of my pop and smtp servers. So I look at my rc.firewall (attached) and well I cannot figure out why I can do things using IP's but not names. Its one thing for me to do this, its another for the rest of the office to do it. For that matter I don't know of the top of my head the ip for www.yahoo.com. So I beseech this email list, what am I doing wrong? ---- Carlos A. Andrade IS Manager RJS Technologies 915.845.5228 ext 13 915.845.2119 fax carlos@rjstech.com [-- Attachment #2 --] ############ # Setup system for firewall service. # $FreeBSD: src/etc/rc.firewall,v 1.30.2.6 2000/09/21 07:44:53 ru Exp $ # Suck in the configuration variables. if [ -r /etc/defaults/rc.conf ]; then . /etc/defaults/rc.conf source_rc_confs elif [ -r /etc/rc.conf ]; then . /etc/rc.conf fi ############ # Define the firewall type in /etc/rc.conf. Valid values are: # open - will allow anyone in # client - will try to protect just this machine # simple - will try to protect a whole network # closed - totally disables IP services except via lo0 interface # UNKNOWN - disables the loading of firewall rules # filename - will load the rules in the given filename (full path required) # # For ``client'' and ``simple'' the entries below should be customized # appropriately ############ # # If you don't know enough about packet filtering, we suggest that you # take time to read this book: # # Building Internet Firewalls # Brent Chapman and Elizabeth Zwicky # # O'Reilly & Associates, Inc # ISBN 1-56592-124-0 # http://www.ora.com/ # # For a more advanced treatment of Internet Security read: # # Firewalls & Internet Security # Repelling the wily hacker # William R. Cheswick, Steven M. Bellowin # # Addison-Wesley # ISBN 0-201-6337-4 # http://www.awl.com/ # if [ -n "${1}" ]; then firewall_type="${1}" fi ############ # Set quiet mode if requested # case ${firewall_quiet} in [Yy][Ee][Ss]) fwcmd="/sbin/ipfw -q" ;; *) fwcmd="/sbin/ipfw" ;; esac ############ # Flush out the list before we begin. # ${fwcmd} -f flush ############ # These rules are required for using natd. All packets are passed to # natd before they encounter your remaining rules. The firewall rules # will then be run again on each packet after translation by natd, # minus any divert rules (see natd(8)). # case ${natd_enable} in [Yy][Ee][Ss]) if [ -n "${natd_interface}" ]; then ${fwcmd} add 50 divert natd all from any to any via ${natd_interface} fi ;; esac ############ # If you just configured ipfw in the kernel as a tool to solve network # problems or you just want to disallow some particular kinds of traffic # then you will want to change the default policy to open. You can also # do this as your only action by setting the firewall_type to ``open''. # # ${fwcmd} add 65000 pass all from any to any ############ # Only in rare cases do you want to change these rules # ${fwcmd} add 100 pass all from any to any via lo0 ${fwcmd} add 200 deny all from any to 127.0.0.0/8 # If you're using 'options BRIDGE', uncomment the following line to pass ARP #${fwcmd} add 300 pass udp from 0.0.0.0 2054 to 0.0.0.0 # Prototype setups. # case ${firewall_type} in [Ss][Ii][Mm][Pp][Ll][Ee]) # I deleted open and client, too many conflicts # so we go directly in to simple # 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. ############ # set these to your outside interface network and netmask and ip oif="xl0" onet="206.249.222.0" omask="255.255.255.224" oip="206.249.222.226" # set these to your inside interface network and netmask and ip iif="xl1" inet="192.168.1.0" imask="255.255.255.224" iip="192.168.1.225" #dns servers #dns1="204.90.111.2" #dns2="205.137.48.5" # Stop spoofing ${fwcmd} add 300 deny all from ${inet}:${imask} to any in via ${oif} ${fwcmd} add 400 deny all from ${onet}:${omask} to any in via ${iif} # Stop RFC1918 nets on the outside interface ${fwcmd} add 500 deny all from 10.0.0.0/8 to any via ${oif} ${fwcmd} add 600 deny all from any to 10.0.0.0/8 out via ${oif} ${fwcmd} add 700 deny all from 172.16.0.0/12 to any via ${oif} ${fwcmd} add 800 deny all from any to 172.16.0.0/12 out via ${oif} ${fwcmd} add 900 deny all from 192.168.0.0/16 to any via ${oif} ${fwcmd} add 1000 deny all from any to 192.168.0.0/16 out 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 1100 deny all from 0.0.0.0/8 to any via ${oif} ${fwcmd} add 1200 deny all from any to 0.0.0.0/8 via ${oif} ${fwcmd} add 1300 deny all from 169.254.0.0/16 to any via ${oif} ${fwcmd} add 1400 deny all from any to 169.254.0.0/16 via ${oif} ${fwcmd} add 1500 deny all from 192.0.2.0/24 to any via ${oif} ${fwcmd} add 1600 deny all from any to 192.0.2.0/24 via ${oif} ${fwcmd} add 1700 deny all from 224.0.0.0/4 to any via ${oif} ${fwcmd} add 1800 deny all from any to 224.0.0.0/4 via ${oif} ${fwcmd} add 1900 deny all from 240.0.0.0/4 to any via ${oif} ${fwcmd} add 2000 deny all from any to 240.0.0.0/4 via ${oif} # Allow TCP through if setup succeeded ${fwcmd} add 2100 pass tcp from any to any established # Allow IP fragments to pass through ${fwcmd} add 2200 pass all from any to any frag # TCP STUFF # Allow access to sendmail for incoming email ${fwcmd} add 2300 pass tcp from any to ${oip} 25 setup # Allow access to our WWW ${fwcmd} add 2400 pass tcp from any to ${oip} 80 setup #SSH login - allow and log all incoming ${fwcmd} add 2500 pass log tcp from any to any 22 in via ${oip} setup #IDENT - reset incoming connections ${fwcmd} add 2600 reset tcp from any to any 113 in via ${oif} setup # Reject&Log all setup of incoming connections from the outside ${fwcmd} add 2700 deny log tcp from any to any in via ${oif} setup # Allow setup of any other TCP connection ${fwcmd} add 2800 pass tcp from any to any setup # UPD STUFF # Allow access to our DNS #${fwcmd} add 2900 pass upd from any to ${dns1} 53 setup #${fwcmd} add 3000 pass upd from any to ${dns2} 53 setup #${fwcmd} add 3100 pass udp from ${dns1} 53 to any #${fwcmd} add 3200 pass udp from ${dns2} 53 to any ${fwcmd} add 2900 pass udp from any 53 to ${oip} ${fwcmd} add 3000 pass udp from ${oip} 53 to any ${fwcmd} add 3100 pass tcp from any to ${oip} 53 setup # SMB - allow local traffic ${fwcmd} add 3300 pass udp from any to any 137-139 via ${iif} # Allow NTP queries out in the world BUT we do it like this # allow server-server on outside interface # allow client-server on inside interface ${fwcmd} add 3400 pass udp from any 123 to any 123 via ${oif} ${fwcmd} add 3500 pass udp from any 123 to any 123 via ${iif} ${fwcmd} add 3600 pass udp from any to any 123 via ${iif} # TRACEROUTE - allow outgoing but not ingoing ${fwcmd} add 3700 pass udp from any to any 33434-33523 out via ${oif} # ICMP stuff #ICMP packets # allow all on internal interface ${fwcmd} add 3800 pass icmp from any to any via ${iif} #Allow outgoing pings but no incoming ${fwcmd} add 3900 pass icmp from any to any icmptypes 8 out via ${oif} ${fwcmd} add 4000 pass icmp from any to any icmptypes 0 in via ${oif} #Allow destination unreachable, source quench, time excedded #and bad header ${fwcmd} add 4100 pass icmp from any to any icmptypes 3,4,11,12 via ${oif} #deny the rest of them ${fwcmd} add 4200 deny icmp from any to any # Everything else is denied by default, unless the # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel # config file. Which it is not ;; esac
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