Date: Fri, 18 May 2001 11:39:54 +0100 From: Ian Chilton <mailinglist@ichilton.co.uk> To: freebsd-stable@FreeBSD.ORG Subject: natd locks me out - incl ipfw rules Message-ID: <20010518113954.A14402@buzz.ichilton.local>
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Hello,
I mailed this list over a week ago, because I setup a firewall and nat on a remote Freebsd-stable box, but when I added IPDIVERT into the kernel which I realiased it was needed, the box doesn't come back after reboot.
Turns out, commenting the following out of rc.conf fixes it:
natd_enable="YES"
natd_flags="-f /etc/natd.conf"
(by not come back, I mean that there is obviously no network access).
It's took a week to get it back, but it hasn't done a lot, so the logs seem in tact, but I can't find anything.
I have shown the relevent files below.
I would appreciate any ideas you have into the problem, and also any comments on the firewall, improvements etc.
Here is what I have in /etc/rc.conf:
# Firewall and NAT:
gateway_enable="YES"
firewall_enable="YES"
firewall_script="/etc/rc.firewall"
firewall_logging="YES"
natd_enable="YES"
natd_flags="-f /etc/natd.conf"
Here is my firewall rules (without the variables and ip's on the top :)
# Stop spoofing
${fwcmd} add deny all from ${inet1}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${inet2}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${inet3}:${imask} to any in via ${oif}
${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif1}
${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif2}
${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif3}
# Stop RFC1918 nets on the outside interface
${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}
# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
# on the outside interface
${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}
# Bandwidth Limiting (outgoing):
# pipe 1 config bw 64Kbit/s queue 10Kbytes
# add pipe 1 all from $(inet1}:$(imask) to any
# add pipe 1 all from $(inet2}:$(imask) to any
# add pipe 1 all from $(inet3}:$(imask) to any
# add pipe 1 all from $(ipfw1) to any
# add pipe 1 all from $(ipfw2) to any
# add pipe 1 all from $(ipfw3) to any
# Network Address Translation.
case ${natd_enable} in
[Yy][Ee][Ss])
if [ -n "${natd_interface}" ]; then
${fwcmd} add divert natd all from any to any via ${oif}
fi
;;
esac
# Bandwidth Limiting (incoming):
# pipe 2 config bw 64Kbit/s queue 10Kbytes
# add pipe 2 all from any to $(inet1):$(imask)
# add pipe 2 all from any to $(inet2):$(imask)
# add pipe 2 all from any to $(inet3):$(imask)
# add pipe 2 all from any to $(ipfw1)
# add pipe 2 all from any to $(ipfw2)
# add pipe 2 all from any to $(ipfw3)
# 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 172.16.0.0/12 to any via ${oif}
${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}
# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
# on the outside interface
${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}
# Allow own network:
${fwcmd} add pass all from ${oip} to ${onet}:${omask}
${fwcmd} add pass all from ${onet}:${omask} to ${oip}
# Allow TCP through if setup succeeded
${fwcmd} add pass tcp from any to any established
# Allow IP fragments to pass through
${fwcmd} add pass all from any to any frag
# Allow setup of incoming ssh
${fwcmd} add pass tcp from any to ${oip} 22 setup
# Allow IMCP on Internal Networks:
${fwcmd} add allow icmp from any to any via ${iif1}
${fwcmd} add allow icmp from any to any via ${iif2}
${fwcmd} add allow icmp from any to any via ${iif3}
# Allow outgoing ping's:
${fwcmd} add allow icmp from any to any icmptypes 8 out via ${oif}
${fwcmd} add allow icmp from any to any icmptypes 0 in via ${oif}
# Allow incoming ping's:
${fwcmd} add allow icmp from any to any icmptypes 0 out via ${oif}
${fwcmd} add allow icmp from any to any icmptypes 8 in via ${oif}
# Allow traceroute:
${fwcmd} add allow icmp from any to any icmptypes 3,4,11,12 via ${oif}
# Disallow all other IMCP:
${fwcmd} add deny log icmp from any to any
# Not sure about this yet, so left commented :)
# ${fwcmd} add unreach filter-prohib log icmp from any to any
# 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 NTP queries out in the world
${fwcmd} add pass udp from ${oip} to any 123 keep-state
# Everything else is denied by default, unless the
# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in the kernel
# config.
Thanks!
Bye for Now,
Ian
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