Date: Tue, 25 Jan 2000 19:40:11 +0200 From: Marc Silver <marcs@icon.co.za> To: freebsd-questions@freebsd.org Subject: ipfw questions (another problem) Message-ID: <20000125194011.A324@icon.co.za>
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Hey All, I'm still having a problem with ipfw over ppp. Please find attached my etc/rc.conf and /etc/rc.firewall. I really need some help here. I manage to dialup now, but I can't ping, or do ANYTHING. Any help would be appreciated. Please reply to this address as I am not on the list from this email address. Cheers, Marc 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_fxp0="inet 192.168.0.1 netmask 255.255.255.0" hostname="core.dulcinea.org.za" moused_type="microsoft" moused_enable="YES" saver="daemon" keyrate="fast" gateway_enable="YES" enable_quotas="NO" check_quotas="NO" # Use ppp configuration. ppp_enable="YES" ppp_mode="auto" ppp_nat="YES" ppp_profile="ondemand" firewall_enable="YES" firewall_script="/etc/rc.firewall" # Which script to run to set up the firewall firewall_type="open" # Firewall type (see /etc/rc.firewall) firewall_quiet="NO" # Set to YES to suppress rule display natd_program="/sbin/natd" # path to natd, if you want a different one. natd_enable="YES" # Enable natd (if firewall_enable == YES). natd_interface="tun0" # Public interface or IPaddress to use. natd_flags="-dynamic" log_in_vain="YES" # Disallow bad connection logging (or YES). tcp_keepalive="YES" # Kill dead TCP connections (or NO). RC.FIREWALL ############ # Setup system for firewall service. # $FreeBSD: src/etc/rc.firewall,v 1.19.2.3 1999/09/30 04:56:27 mpp Exp $ # Suck in the configuration variables. if [ -f /etc/defaults/rc.conf ]; then . /etc/defaults/rc.conf elif [ -f /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 [ "x$1" != "x" ]; then firewall_type=$1 fi ############ # Set quiet mode if requested if [ "x$firewall_quiet" = "xYES" ]; then fwcmd="/sbin/ipfw -q" else fwcmd="/sbin/ipfw" fi ############ # Flush out the list before we begin. $fwcmd -f flush ############ # These rules are required for using natd. All packets are passed to # natd before they encounter your remaining rules. The firewall rules # will then be run again on each packet after translation by natd, # minus any divert rules (see natd(8)). if [ "X${natd_enable}" = X"YES" -a "X${natd_interface}" != X"" ]; then $fwcmd add divert natd all from any to any via ${natd_interface} fi ############ # 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 $fwcmd add 200 deny all from any to 127.0.0.0/8 # Prototype setups. if [ "${firewall_type}" = "open" -o "${firewall_type}" = "OPEN" ]; then $fwcmd add 65000 pass all from any to any elif [ "${firewall_type}" = "client" ]; then ############ # This is a prototype setup that will protect your system somewhat against # people from outside your own network. ############ # set these to your network and netmask and ip net="10.0.0.0" mask="255.255.255.0" ip="10.0.0.1" # Allow DNS queries out in the world $fwcmd add pass log udp from any 53 to ${ip} $fwcmd add pass log udp from ${ip} to any 53 # Allow setup of outgoing TCP connections only $fwcmd add pass log tcp from ${ip} to any setup # Allow TCP through if setup succeeded $fwcmd add pass log tcp from any to any established # Allow setup of incoming web server requests $fwcmd add pass log tcp from any to ${ip} 80 setup # Allow any traffic to or from my own net. $fwcmd add pass log all from ${ip} to ${net}:${mask} $fwcmd add pass log all from ${net}:${mask} to ${ip} # Disallow setup of all other TCP connections $fwcmd add deny log tcp from any to any setup # Everything else is denied as default. elif [ "${firewall_type}" = "simple" ]; then ############ # 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="ed0" onet="192.168.4.0" omask="255.255.255.0" oip="192.168.4.17" # set these to your inside interface network and netmask and ip iif="ed1" inet="192.168.3.0" imask="255.255.255.0" iip="192.168.3.17" # 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 192.168.0.0:255.255.0.0 to any via ${oif} $fwcmd add deny all from any to 192.168.0.0:255.255.0.0 via ${oif} $fwcmd add deny all from 172.16.0.0:255.240.0.0 to any via ${oif} $fwcmd add deny all from any to 172.16.0.0:255.240.0.0 via ${oif} $fwcmd add deny all from 10.0.0.0:255.0.0.0 to any via ${oif} $fwcmd add deny all from any to 10.0.0.0:255.0.0.0 via ${oif} # Allow TCP through if setup succeeded $fwcmd add pass tcp from any to any established # 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 # Allow access to our WWW $fwcmd add pass tcp from any to ${oip} 80 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 any 53 to ${oip} $fwcmd add pass udp from ${oip} to any 53 # Allow NTP queries out in the world $fwcmd add pass udp from any 123 to ${oip} $fwcmd add pass udp from ${oip} to any 123 # Everything else is denied as default. elif [ "${firewall_type}" != "UNKNOWN" -a -r "${firewall_type}" ]; then $fwcmd ${firewall_type} fi -- We spend all of our lives, going out of our minds, Looking back to our births, forward to our demise... 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