Date: Wed, 02 Aug 2000 14:56:08 -0500 From: Jeff <jeff@kreska.org> To: freebsd-questions@freebsd.org Subject: ipfw and enabling ftp from outside?? Message-ID: <39887CD8.DA87F900@kreska.org>
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I have a dual homed configuration with one interface 24.x.x.x.(outside
validIp) and the other 192.168.0.1 (Inside)
When I ftp using netscape/ie from an inside machine all works fine. If
I try and ftp from an outside machine it fails. In the status window I
see contacted blah....:49152 but no response.
I am sure that something is configured wrong with my ifpw rules, but I
am not sure what. I tryed the rc.firewall entry's listed on FreeBSD
cheats with no success.
here is what I have for ipfw (rc.firewall):
# set these to your outside interface network and netmask and ip
oif="ed0"
onet="24.x.x..0"
omask="255.255.255.128"
oip="24.x.x.x"
# set these to your inside interface network and netmask and ip
iif="vr0"
inet="192.168.0.0"
imask="255.255.255.0"
iip="192.168.0.1"
# My ISP's DNS servers
dns1="24.x.x.x"
dns2="24.x.x.x"
# Stop spoofing
${fwcmd} add deny log all from ${inet}:${imask} to any in
via ${oif}
${fwcmd} add deny log all from ${onet}:${omask} to any in
via ${iif}
# Stop RFC1918 nets on the outside interface
${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif}
${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif}
${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}
${fwcmd} add deny all from any to 192.168.0.0/16 out via
${oif}
# Stop draft-manning-dsua-01.txt nets on the outside
interface
${fwcmd} add deny log all from 0.0.0.0/8 to any via ${oif}
${fwcmd} add deny log all from any to 0.0.0.0/8 via ${oif}
${fwcmd} add deny log all from 169.254.0.0/16 to any via
${oif}
${fwcmd} add deny log all from any to 169.254.0.0/16 via
${oif}
${fwcmd} add deny log all from 192.0.2.0/24 to any via
${oif}
${fwcmd} add deny log all from any to 192.0.2.0/24 via
${oif}
${fwcmd} add deny log all from 224.0.0.0/4 to any via
${oif}
${fwcmd} add deny log all from any to 224.0.0.0/4 via
${oif}
${fwcmd} add deny log all from 240.0.0.0/4 to any via
${oif}
${fwcmd} add deny log all from any to 240.0.0.0/4 via
${oif}
# Allow established connections
${fwcmd} add pass tcp from any to any established
# Allow IP fragments to pass through
${fwcmd} add pass all from any to any frag
### TCP SETUP RULES
# HTTP - Allow access to our web server
${fwcmd} add pass tcp from any to any 80 setup
# SMTP - Allow access to sendmail for incoming e-mail
${fwcmd} add pass tcp from any to any 25 setup
# FTP - Allow incoming data channel for outgoing
connections,
# Reject&Log all incoming control connections
${fwcmd} add pass tcp from any 20 to any 1024-65535 setup
# ${fwcmd} add deny log tcp from any to any 21 in via ${oif}
setup
${fwcmd} add pass log tcp from any to any 21 in via ${oif}
setup
# SSH Login - Allow & Log all incoming
${fwcmd} add pass log tcp from any to any 22 in via ${oif}
setup
# IDENT - Reset incoming connections
${fwcmd} add reset tcp from any to any 113 in via ${oif}
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
### UDP RULES
# DNS - Allow queries out in the world
# ${fwcmd} add pass udp from any to ${dns1} 53
# ${fwcmd} add pass udp from any to ${dns2} 53
# ${fwcmd} add pass udp from ${dns1} 53 to any
# ${fwcmd} add pass udp from ${dns2} 53 to any
${fwcmd} add pass udp from any to any 53
${fwcmd} add pass udp from any 53 to any
# SMB - Allow local traffic
${fwcmd} add pass udp from any to any 137-139 via ${iif}
# NTP - Allow server-to-server on outside interface,
client-to-server
# on inside interface
${fwcmd} add pass udp from any 123 to any 123 via ${oif}
${fwcmd} add pass udp from any 123 to any via ${iif}
${fwcmd} add pass udp from any to any 123 via ${iif}
# TRACEROUTE - Allow outgoing, but not incoming
${fwcmd} add pass udp from any to any 33434-33523 out via
${oif}
### ICMP RULES
# ICMP packets
# Allow all ICMP packets on internal interface
${fwcmd} add pass icmp from any to any via ${iif}
# ICMP - Allow ping, et. al., for testing
${fwcmd} add pass icmp from any to any
# Allow outgoing pings, but not incoming
${fwcmd} add pass icmp from any to any icmptypes 8 out via
${oif}
${fwcmd} add pass icmp from any to any icmptypes 0 in via
${oif}
# Allow Destination Unreachable, Source Quench, Time
Exceeded, and Bad Header
${fwcmd} add pass icmp from any to any icmptypes 3,4,11,12
via ${oif}
# Deny the rest of them
${fwcmd} add deny icmp from any to any
### MISCELLANEOUS REJECT RULES
# Reject broadcasts from outside interface
${fwcmd} add 63000 deny ip from any to 0.0.0.255:0.0.0.255
in via ${oif}
# Reject&Log SMB connections on outside interface
${fwcmd} add 64000 deny log udp from any to any 137-139 via
${oif}
# Reject&Log all other connections from outside interface
${fwcmd} add 65000 deny log ip from any to any via ${oif}
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