ipf + ipnat + dmz + bridge question

[Nelis Lamprecht]

On Thu, 2004-02-05 at 02:57, Jason Lavigne wrote:
> Hello all,
>  
> I currently have a firewall with 3 nics, one goes to the net, one to the
> DMZ and one to the LAN. I have ipf and ipnat running along with FreeBSD
> bridge support and I have the external nic and the DMZ nic bridged. All
> DMZ computers are configured with a real public ip and have the firewall
> as the gateway.
>  
> My question is when any computer from my DMZ goes out to the net it uses
> the ip of the firewall and not the public ip it was assigned. Internally
> within the DMZ they use the correct ips. How can I make it so when the
> DMZ computers are on the net they report as using their assigned ip. Is
> the DMZ using ipnat? I only have the LAN mapped in ipnat.rules and
> nothing about the DMZ ips.
>  
> TIA
>  
> Jay
>  
> Here are my configs:
>  
> ifconfig
>  
> dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255
>         inet6 fe80::203:6dff:fe00:9bd%dc0 prefixlen 64 scopeid 0x1
>         ether 00:03:6d:00:09:bd
>         media: Ethernet autoselect (100baseTX)
>         status: active
> dc1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
>         inet6 fe80::280:c6ff:feea:7af1%dc1 prefixlen 64 scopeid 0x2
>         inet xxx.yyy.200.99 netmask 0xfffffff0 broadcast xxx.yyy.200.111
>         ether 00:80:c6:ea:7a:f1
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> xl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
>         options=3<RXCSUM,TXCSUM>
>         inet6 fe80::250:daff:fe1b:90c3%xl0 prefixlen 64 scopeid 0x3
>         inet xxx.yyy.200.106 netmask 0xffffffff broadcast
> xxx.yyy.200.106
>         inet xxx.yyy.200.107 netmask 0xffffffff broadcast
> xxx.yyy.200.107
>         ether 00:50:da:1b:90:c3
>         media: Ethernet autoselect (10baseT/UTP)
>         status: active
> lp0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>         inet6 ::1 prefixlen 128
>         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
>         inet 127.0.0.1 netmask 0xff000000
> tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1492
>         inet xxx.yyy.200.97 --> 207.136.64.4 netmask 0xffffff00
>         Opened by PID 241
>  
> /etc/ipnat.rules
>  
> # nat the lan
> map xl0 192.168.1.0/24 -> xxx.yyy.200.97/32

try changing this to:

map xl0 from 192.168.1.0/24 ! to xxx.yyy.200.99/32 -> xxx.yyy.200.97/32

which basically tells ipnat to always use NAT unless you are speaking
with your DMZ xxx.yyy.200.99/32


Regards,
-- 
Nelis Lamprecht
PGP: http://www.8ball.co.za/pgp/nelis.key
"Unix IS user friendly.. It's just selective about who its friends are."