Date: Wed, 20 Sep 2000 07:01:16 -0700 From: Chip <chip@wiegand.org> To: cjclark@alum.mit.edu Cc: "seafug@dub.net" <seafug@dub.net>, "freebsd-questions@freebsd.org" <freebsd-questions@FreeBSD.ORG> Subject: Re: natd does port forwarding? Message-ID: <39C8C32C.647A7216@wiegand.org> References: <39C6FCCC.D0103226@wiegand.org> <20000918225104.I367@149.211.6.64.reflexcom.com> <39C70308.EF52766F@wiegand.org> <20000919000233.L367@149.211.6.64.reflexcom.com> <39C84A4B.766B5B24@wiegand.org> <20000919232213.Q367@149.211.6.64.reflexcom.com>
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This is a multi-part message in MIME format. --------------E863FF6732CD3E3FF437E500 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit "Crist J . Clark" wrote: > > On Tue, Sep 19, 2000 at 10:25:31PM -0700, Chip wrote: > > According to top natd is running, in fact, after a reboot it > > showed two instances of it running. I have attached my rc.conf, > > rc.firewall, and natd.conf in the hopes that someone can tell > > me where I have gone wrong, because port forwarding is not > > working. > > OK, I made some observations. What version of FreeBSD are you using, > BTW? FreeBSD 4.0 the one on the Cheapbytes cd, I don't know if its -release or what. > > > More details in the text below for any new readers. > > The firewall is basically the default, I will tighten up the > > rules > > after I get port-forwarding running. > > Loosen them up first to get things going, but I mentioned that below. > > > Any help would be greatly appreciated. > > [snip] > > > natd.conf -- > > > > use_sockets yes > > same_ports yes > > interface ep1 > > redirect_port tcp 192.168.0.7:80 80 > > > rc.conf -- > > > > # This file now contains just the overrides from /etc/defaults/rc.conf > > # please make all changes to this file. > > > > # -- sysinstall generated deltas -- # > > ifconfig_xl0="inet 192.168.0.1 netmask 255.255.255.0" > > ifconfig_ep1="inet 208.194.173.26 netmask 255.255.255.128" > > hostname="firewall2.wiegand.org" > > linux_enable="YES" > > moused_enable="YES" > > firewall_enable="YES" > > firewall_script="/etc/rc.firewall" > > firewall_type="simple" > > Open things up to get them working first, > > firewall_type="open" > > > gateway_enable="YES" > > router_enable="YES" > > Remove this. It is not needed. > > > defaultrouter="208.194.173.1" > > natd_enable="YES" > > natd_interface="ep1" > > You forgot, > > natd_flags="-f /etc/natd.conf" > Okay, I've added that line and commented out the other two. Just out of curiousity, I thought those were necessary, I have a 7 pc network here at home. > > rc.firewall -- > > > > ############ > > # Setup system for firewall service. > > # $FreeBSD: src/etc/rc.firewall,v 1.30 2000/02/06 19:24:37 paul Exp $ > > > > # Suck in the configuration variables. > > if [ -r /etc/defaults/rc.conf ]; then > > . /etc/defaults/rc.conf > > if [ -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 "${1}" ]; then > > ifirewall_type="${1}" > > fi > > > > ############ > > # Set quiet mode if requested > > # > > case ${firewall_quiet} in > > [Yy][Ee][Ss]) > > fwcmd="/sbin/ipfw -q" > > ;; > > *) > > ifwcmd="/sbin/ipfw" > > ;; > > esac > > > > ############ > > # Flush out the list before we begin. > > # > > /sbin/ipfw -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 ${natd_enable} in > > #[Yy][Ee][Ss]) > > # if [ -n "ep1" ]; then > > /sbin/ipfw add divert natd all from any to any via ep1 > > #fi > > # ;; > > #esac > > This has been modified. I took out the #'s in this section. > > > ############ > > # If you just configured ipfw in the kernel as a tool to solve network > > # problems or you just want to disallow some particular kinds of traffic > > # then you will want to change the default policy to open. You can also > > # do this as your only action by setting the firewall_type to ``open''. > > # > > /sbin/ipfw add 65000 pass all from any to any > > Why is this uncommented? > Not sure why, so I commented it back out. > > ############ > > # Only in rare cases do you want to change these rules > > # > > /sbin/ipfw add 100 pass all from any to any via lo0 > > /sbin/ipfw add 200 deny all from any to 127.0.0.0/8 > > # If you're using 'options BRIDGE', uncomment the following line to pass ARP > > #${fwcmd} add 300 pass udp from 0.0.0.0 2054 to 0.0.0.0 > > > > > > # Prototype setups. > > # > > case ${firewall_type} in > > [Oo][Pp][Ee][Nn]) > > #if [ "${firewall}" = "open" ]; then > > Hmmm... Hmmm??? > > > /sbin/ipfw add 65000 pass all from any to any > > ;; > > > > [Cc][Ll][Ii][Ee][Nn][Tt]) > > ############ > > # This is a prototype setup that will protect your system somewhat > > # against people from outside your own network. > > ############ > > #elif [ "${firewall}" = "client" ]; then > > This was in the default? What version again? I commented this line and the couple others, it kept giving error like- line xxx has a word but wanted a ;; or ) or some such. Now with those lines commented it works without error. > > > # set these to your network and netmask and ip > > net="192.168.0.0" > > mask="255.255.255.0" > > ip="192.168.0.1" > > > > # Allow any traffic to or from my own net. > > /sbin/ipfw add pass all from ${ip} to ${net}:${mask} > > /sbin/ipfw add pass all from ${net}:${mask} to ${ip} > > > > # Allow TCP through if setup succeeded > > /sbin/ipfw add pass tcp from any to any established > > > > # Allow IP fragments to pass through > > /sbin/ipfw add pass all from any to any frag > > > > # Allow setup of incoming email > > /sbin/ipfw add pass tcp from any to ${ip} 25 setup > > > > # Allow setup of outgoing TCP connections only > > /sbin/ipfw add pass tcp from ${ip} to any setup > > > > # Disallow setup of all other TCP connections > > /sbin/ipfw add deny tcp from any to any setup > > > > # Allow DNS queries out in the world > > /sbin/ipfw add pass udp from any 53 to ${ip} > > /sbin/ipfw add pass udp from ${ip} to any 53 > > > > # Allow NTP queries out in the world > > /sbin/ipfw add pass udp from any 123 to ${ip} > > /sbin/ipfw add pass udp from ${ip} to any 123 > > > > # Everything else is denied by default, unless the > > # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel > > # config file. > > ;; > > > > [Ss][Ii][Mm][Pp][Ll][Ee]) > > ############ > > # This is a prototype setup for a simple firewall. Configure this > > # machine as a named server and ntp server, and point all the machines > > # on the inside at this machine for those services. > > ############ > > #elif [ "${firewall}" = "simple" ]; then > > # set these to your outside interface network and netmask and ip > > oif="ep1" > > onet="208.240.173.0" > > omask="255.255.255.128" > > oip="208.240.173.26" > > These numbers do not match the ones you gave above in rc.conf. I fixed this, thanks for noticing, it was getting late. > > > # set these to your inside interface network and netmask and ip > > iif="xl0" > > inet="192.168.0.0" > > imask="255.255.255.0" > > iip="192.168.0.1" > > > > # Stop spoofing > > /sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif} > > /sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif} > > > > # Stop RFC1918 nets on the outside interface > > /sbin/ipfw add deny all from 10.0.0.0/8 to any via ${oif} > > /sbin/ipfw add deny all from any to 10.0.0.0/8 via ${oif} > > /sbin/ipfw add deny all from 172.16.0.0/12 to any via ${oif} > > /sbin/ipfw add deny all from any to 172.16.0.0/12 via ${oif} > > /sbin/ipfw add deny all from 192.168.0.0/16 to any via ${oif} > > /sbin/ipfw add deny all from any to 192.168.0.0/16 via ${oif} > > > > # Stop draft-manning-dsua-01.txt nets on the outside interface > > /sbin/ipfw add deny all from 0.0.0.0/8 to any via ${oif} > > /sbin/ipfw add deny all from any to 0.0.0.0/8 via ${oif} > > /sbin/ipfw add deny all from 169.254.0.0/16 to any via ${oif} > > /sbin/ipfw add deny all from any to 169.254.0.0/16 via ${oif} > > /sbin/ipfw add deny all from 192.0.2.0/24 to any via ${oif} > > /sbin/ipfw add deny all from any to 192.0.2.0/24 via ${oif} > > /sbin/ipfw add deny all from 224.0.0.0/4 to any via ${oif} > > /sbin/ipfw add deny all from any to 224.0.0.0/4 via ${oif} > > /sbin/ipfw add deny all from 240.0.0.0/4 to any via ${oif} > > /sbin/ipfw add deny all from any to 240.0.0.0/4 via ${oif} > > > > # Allow TCP through if setup succeeded > > /sbin/ipfw add pass tcp from any to any established > > > > # Allow IP fragments to pass through > > /sbin/ipfw add pass all from any to any frag > > > > # Allow setup of incoming email > > /sbin/ipfw add pass tcp from any to ${oip} 25 setup > > > > # Allow access to our DNS > > /sbin/ipfw add pass tcp from any to ${oip} 53 setup > > /sbin/ipfw add pass udp from any to ${oip} 53 > > /sbin/ipfw add pass udp from ${oip} 53 to any > > > > # Allow access to our WWW > > /sbin/ipfw add pass tcp from any to ${oip} 80 setup > > > > # Reject&Log all setup of incoming connections from the outside > > /sbin/ipfw add deny log tcp from any to any in via ${oif} setup > > > > # Allow setup of any other TCP connection > > /sbin/ipfw add pass tcp from any to any setup > > > > # Allow DNS queries out in the world > > /sbin/ipfw add pass udp from any 53 to ${oip} > > /sbin/ipfw add pass udp from ${oip} to any 53 > > > > # Allow NTP queries out in the world > > /sbin/ipfw add pass udp from any 123 to ${oip} > > /sbin/ipfw add pass udp from ${oip} to any 123 > > > > # Everything else is denied by default, unless the > > # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel > > # config file. > > ;; > > fi > > ) > > #[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) > > > > ;; > > ) > > ) > > # if [ -r "${firewall_type}" ]; then > > /sbin/ipfw ${firewall_flags} ${firewall_type} > > # fi > > ;; > > esac > > fi > > -- > Crist J. Clark cjclark@alum.mit.edu Once again, the new versions are attached. Could the problem be at the web server? I can connect to via its ip address from anywhere inside the network and it will return the proper web page, so I am assuming that means it will work. It has the outside nic, 208.194.173.26, as a gateway. Anything else need to be specified on the server network settings to get this to work at it's end? -- Chip W. www.wiegand.org Alternative Operating Systems --------------E863FF6732CD3E3FF437E500 Content-Type: text/plain; charset=us-ascii; name="rc.conf" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="rc.conf" # This file now contains just the overrides from /etc/defaults/rc.conf # please make all changes to this file. # -- sysinstall generated deltas -- # ifconfig_xl0="inet 192.168.0.1 netmask 255.255.255.0" ifconfig_ep1="inet 208.194.173.26 netmask 255.255.255.128" hostname="firewall2.wiegand.org" linux_enable="YES" moused_enable="YES" firewall_enable="YES" firewall_script="/etc/rc.firewall" firewall_type="open" # gateway_enable="YES" # router_enable="YES" defaultrouter="208.194.173.1" natd_enable="YES" natd_interface="ep1" natd_flags="-f /etc/natd.conf" --------------E863FF6732CD3E3FF437E500 Content-Type: text/plain; charset=us-ascii; name="rc.firewall" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="rc.firewall" ############ # Setup system for firewall service. # $FreeBSD: src/etc/rc.firewall,v 1.30 2000/02/06 19:24:37 paul Exp $ # Suck in the configuration variables. if [ -r /etc/defaults/rc.conf ]; then . /etc/defaults/rc.conf if [ -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 "${1}" ]; then ifirewall_type="${1}" fi ############ # Set quiet mode if requested # case ${firewall_quiet} in [Yy][Ee][Ss]) fwcmd="/sbin/ipfw -q" ;; *) ifwcmd="/sbin/ipfw" ;; esac ############ # Flush out the list before we begin. # /sbin/ipfw -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 ${natd_enable} in [Yy][Ee][Ss]) if [ -n "ep1" ]; then /sbin/ipfw add divert 8668 all from any to any via ep1 fi ;; esac ############ # If you just configured ipfw in the kernel as a tool to solve network # problems or you just want to disallow some particular kinds of traffic # then you will want to change the default policy to open. You can also # do this as your only action by setting the firewall_type to ``open''. # # /sbin/ipfw add 65000 pass all from any to any ############ # Only in rare cases do you want to change these rules # /sbin/ipfw add 100 pass all from any to any via lo0 /sbin/ipfw add 200 deny all from any to 127.0.0.0/8 # If you're using 'options BRIDGE', uncomment the following line to pass ARP #${fwcmd} add 300 pass udp from 0.0.0.0 2054 to 0.0.0.0 # Prototype setups. # case ${firewall_type} in [Oo][Pp][Ee][Nn]) #if [ "${firewall}" = "open" ]; then /sbin/ipfw add 65000 pass all from any to any ;; [Cc][Ll][Ii][Ee][Nn][Tt]) ############ # This is a prototype setup that will protect your system somewhat # against people from outside your own network. ############ #elif [ "${firewall}" = "client" ]; then # set these to your network and netmask and ip net="192.168.0.0" mask="255.255.255.0" ip="192.168.0.1" # Allow any traffic to or from my own net. /sbin/ipfw add pass all from ${ip} to ${net}:${mask} /sbin/ipfw add pass all from ${net}:${mask} to ${ip} # Allow TCP through if setup succeeded /sbin/ipfw add pass tcp from any to any established # Allow IP fragments to pass through /sbin/ipfw add pass all from any to any frag # Allow setup of incoming email /sbin/ipfw add pass tcp from any to ${ip} 25 setup # Allow setup of outgoing TCP connections only /sbin/ipfw add pass tcp from ${ip} to any setup # Disallow setup of all other TCP connections /sbin/ipfw add deny tcp from any to any setup # Allow DNS queries out in the world /sbin/ipfw add pass udp from any 53 to ${ip} /sbin/ipfw add pass udp from ${ip} to any 53 # Allow NTP queries out in the world /sbin/ipfw add pass udp from any 123 to ${ip} /sbin/ipfw add pass udp from ${ip} to any 123 # Everything else is denied by default, unless the # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel # config file. ;; [Ss][Ii][Mm][Pp][Ll][Ee]) ############ # This is a prototype setup for a simple firewall. Configure this # machine as a named server and ntp server, and point all the machines # on the inside at this machine for those services. ############ #elif [ "${firewall}" = "simple" ]; then # set these to your outside interface network and netmask and ip oif="ep1" onet="208.194.173.0" omask="255.255.255.128" oip="208.194.173.26" # set these to your inside interface network and netmask and ip iif="xl0" inet="192.168.0.0" imask="255.255.255.0" iip="192.168.0.1" # Stop spoofing /sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif} /sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif} # Stop RFC1918 nets on the outside interface /sbin/ipfw add deny all from 10.0.0.0/8 to any via ${oif} /sbin/ipfw add deny all from any to 10.0.0.0/8 via ${oif} /sbin/ipfw add deny all from 172.16.0.0/12 to any via ${oif} /sbin/ipfw add deny all from any to 172.16.0.0/12 via ${oif} /sbin/ipfw add deny all from 192.168.0.0/16 to any via ${oif} /sbin/ipfw add deny all from any to 192.168.0.0/16 via ${oif} # Stop draft-manning-dsua-01.txt nets on the outside interface /sbin/ipfw add deny all from 0.0.0.0/8 to any via ${oif} /sbin/ipfw add deny all from any to 0.0.0.0/8 via ${oif} /sbin/ipfw add deny all from 169.254.0.0/16 to any via ${oif} /sbin/ipfw add deny all from any to 169.254.0.0/16 via ${oif} /sbin/ipfw add deny all from 192.0.2.0/24 to any via ${oif} /sbin/ipfw add deny all from any to 192.0.2.0/24 via ${oif} /sbin/ipfw add deny all from 224.0.0.0/4 to any via ${oif} /sbin/ipfw add deny all from any to 224.0.0.0/4 via ${oif} /sbin/ipfw add deny all from 240.0.0.0/4 to any via ${oif} /sbin/ipfw add deny all from any to 240.0.0.0/4 via ${oif} # Allow TCP through if setup succeeded /sbin/ipfw add pass tcp from any to any established # Allow IP fragments to pass through /sbin/ipfw add pass all from any to any frag # Allow setup of incoming email /sbin/ipfw add pass tcp from any to ${oip} 25 setup # Allow access to our DNS /sbin/ipfw add pass tcp from any to ${oip} 53 setup /sbin/ipfw add pass udp from any to ${oip} 53 /sbin/ipfw add pass udp from ${oip} 53 to any # Allow access to our WWW /sbin/ipfw add pass tcp from any to ${oip} 80 setup # Reject&Log all setup of incoming connections from the outside /sbin/ipfw add deny log tcp from any to any in via ${oif} setup # Allow setup of any other TCP connection /sbin/ipfw add pass tcp from any to any setup # Allow DNS queries out in the world /sbin/ipfw add pass udp from any 53 to ${oip} /sbin/ipfw add pass udp from ${oip} to any 53 # Allow NTP queries out in the world /sbin/ipfw add pass udp from any 123 to ${oip} /sbin/ipfw add pass udp from ${oip} to any 123 # Everything else is denied by default, unless the # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel # config file. ;; fi ) #[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) ;; ) ) # if [ -r "${firewall_type}" ]; then /sbin/ipfw ${firewall_flags} ${firewall_type} # fi ;; esac fi --------------E863FF6732CD3E3FF437E500-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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