Date: Tue, 10 Jan 2006 10:53:24 -0600 From: Dennis Olvany <dennisolvany@gmail.com> To: Andrew Fremantle <freebsd@skyhawk.ca> Cc: freebsd-ipfw@freebsd.org, freebsd-questions@freebsd.org Subject: Re: Advanced IPFW2 Forward rule problem / bug / misunderstanding Message-ID: <43C3E684.5040204@gmail.com> In-Reply-To: <43C3896A.7090704@skyhawk.ca> References: <43C3896A.7090704@skyhawk.ca>
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This should get you most of the way there or at least give you a good
idea of what's required.
> options IPFIREWALL_FORWARD_EXTENDED
I'm pretty sure this will be required.
> defaultrouter="24.85.92.1"
> ifconfig_rl0="192.168.1.1"
> ifconfig_vr0="142.179.109.xxx netmask 255.255.248.0"
> ifconfig_vr1="216.232.85.xxx netmask 255.255.254.0"
> ifconfig_rue0="24.85.9x.xxx netmask 255.255.252.0"
> ifconfig_rue0_alias0="24.85.9x.xxx netmask 255.255.255.255"
> Telus
> ext1_ip="142.179.109.xxx" # IP Address
> ext1_gw="142.179.104.254" # IP Gateway
> ext2_ip="216.232.85.xxx" # IP Address
> ext2_gw="216.232.84.254" # IP Gateway
> Shaw Cable
> shaw_ip="24.85.93.xxx" # IP Address
> shaw_gw="24.85.92.1" # IP Gateway
> srv2_ext="24.85.93.xxx" # External IP of server
> INTERNAL
> int_ip="192.168.1.1" # IP Address
> # And run our new NATd
> /sbin/natd -log_ipfw_denied -i ${nat_in} -o ${nat_out} -s -m -u -n
> ${shaw} -punch_fw 36000:100 -redirect_port tcp ${ext1_srv}:22
> ${ext1_ip}:xxxx -redirect_port tcp ${ext1_srv}:53 ${ext1_ip}:53
> -redirect_port tcp ${ext1_srv}:80 ${ext1_ip}:80 -redirect_port tcp
> ${ext1_srv}:443 ${ext1_ip}:443 -redirect_port udp ${ext1_srv}:53
> ${ext1_ip}:53 -redirect_port tcp ${ext2_srv}:80 ${ext2_ip}:80
> -redirect_port tcp ${ext2_srv}:443 ${ext2_ip}:443 -redirect_port tcp
> ${srv1_int}:22 ${shaw_ip}:xxxx -redirect_port tcp ${srv1_int}:53
> ${shaw_ip}:53 -redirect_port udp ${srv1_int}:53 ${shaw_ip}:53
> -redirect_port tcp ${srv1_int}:80 ${shaw_ip}:80 -redirect_port tcp
> ${srv1_int}:443 ${shaw_ip}:443 -redirect_port tcp ${srv2_int}:80
> ${srv2_ext}:80 -redirect_port tcp ${srv2_int}:443 ${srv2_ext}:443
That's a hefty nat command. Let's simplfy by putting it in a file. I
leave the port forwarding to you.
/etc/rc.conf
natd_enable="yes"
natd_flags="-f /etc/natd.conf"
/etc/natd.conf
instance default
interface vr0
port 8668
instance telus2
interface vr1
port 8669
instance shaw1
alias_address 24.85.93.xxx
port 8670
instance shaw2
alias_address 24.85.93.xxx
port 8671
globalport 8672
I see that your firewall is based on rc.firewall. Forget rc.firewall, it
is junk. Base your firewall on this structure.
1. Public Interface NAT Diversion
2. check-state
3. Public Interface Leak Prevention
3.1 deny egress from internal hosts
3.2 deny ingress to internal hosts
4. Antispoof
4.1 allow via loopback interface
4.2 deny ingress from router
4.3 deny ingress from internal hosts via public interface
5. Router
5.1 allow egress
5.2 deny egress
5.3 allow ingress
5.4 deny ingress
6. Internal Hosts
6.1 allow egress
6.2 deny egress
6.3 allow ingress
6.4 deny ingress
7. Default Deny
/etc/rc.conf
firewall_enable="yes"
firewall_type="/etc/ipfw.rules"
/etc/ipfw.rules
-f flush
add divert 8668 ip from any to any in via vr0
add divert 8669 ip from any to any in via vr1
add divert 8670 ip from any to 24.85.93.xxx in via rue0
add divert 8671 ip from any to 24.85.93.xxx in via rue0
#have never known the globalport to work on inbound
add divert 8672 ip from any to any out via { vr0 or vr1 or rue0 }
#not sure if that 'or' will work... may need to split it up
check-state
add deny ip from 192.168.1.1/24 to any via { vr0 or vr1 or rue0 }
add allow ip from me to me via lo0 keep-state
add deny ip from me to any in
add allow ip from me to { me or 192.168.1.1/24 or 142.179.109.xxx/21 or
216.232.85.xxx/23 or 24.85.9x.xxx/22 } keep-state
add forward 142.179.104.254 ip from 142.179.109.xxx to any keep-state
add forward 216.232.84.254 ip from 216.232.85.xxx to any keep-state
add forward 24.85.92.1 ip from 24.85.9x.xxx to any keep-state
add forward 24.85.92.1 ip from 24.85.9x.xxx to any keep-state
add allow ip from me to any keep-state
add deny ip from me to any
add allow icmp from any to me icmptypes 3,4,8,11 keep-state
add deny ip from any to me
add allow ip from 192.168.1.1/24 to any keep-state
add deny ip from 192.168.1.1/24 to any
add allow icmp from any to 192.168.1.1/24 icmptypes 3,4,11 keep-state
add deny ip from any to 192.168.1.1/24
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