Date: Tue, 19 Sep 2000 23:22:13 -0700 From: "Crist J . Clark" <cjclark@reflexnet.net> To: Chip <chip@wiegand.org> Cc: "seafug@dub.net" <seafug@dub.net>, "freebsd-questions@freebsd.org" <freebsd-questions@FreeBSD.ORG> Subject: Re: natd does port forwarding? Message-ID: <20000919232213.Q367@149.211.6.64.reflexcom.com> In-Reply-To: <39C84A4B.766B5B24@wiegand.org>; from chip@wiegand.org on Tue, Sep 19, 2000 at 10:25:31PM -0700 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>
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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? > 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" > 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 ${natd_enable} in > #[Yy][Ee][Ss]) > # if [ -n "ep1" ]; then > /sbin/ipfw add divert natd all from any to any via ep1 > #fi > # ;; > #esac This has been modified. > ############ > # If you just configured ipfw in the kernel as a tool to solve network > # problems or you just want to disallow some particular kinds of traffic > # then you will want to change the default policy to open. You can also > # do this as your only action by setting the firewall_type to ``open''. > # > /sbin/ipfw add 65000 pass all from any to any Why is this uncommented? > ############ > # Only in rare cases do you want to change these rules > # > /sbin/ipfw add 100 pass all from any to any via lo0 > /sbin/ipfw add 200 deny all from any to 127.0.0.0/8 > # If you're using 'options BRIDGE', uncomment the following line to pass ARP > #${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... > /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? > # 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. > # 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. 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