Date: Wed, 20 Sep 2000 08:49:42 -0700 (PDT) From: The Utz Family <utz@serv.net> To: "seafug@dub.net" <seafug@dub.net> Cc: Chip <chip@wiegand.org>, "freebsd-questions@freebsd.org" <freebsd-questions@FreeBSD.ORG> Subject: what about ppp -alias? Re: natd does port forwarding? Message-ID: <Pine.BSF.4.02.10009200848350.55933-100000@itchy.serv.net> In-Reply-To: <20000919232213.Q367@149.211.6.64.reflexcom.com>
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ok, so is natd a superior solution to the userland ppp forwarding? if so, why? pontificate away! :-) On 19 Sep 2000, 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? > > > 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. Clark cjclark@alum.mit.edu > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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