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 From:  Don Munyak <don dot munyak at gmail dot com>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Fwd: [m0n0wall] CENTOS 4 problem with 1:1 NAT
 Date:  Mon, 7 Nov 2005 21:11:32 -0500
Try turning off DHCP in the DMZ and using static IP, DNS and GW on the
Centos machine. You should never apply at static IP "within" the DHCP

- Don

---------- Forwarded message ----------
From: Marc Infield <marc at infielddesign dot com>
Date: Nov 7, 2005 8:49 PM
Subject: [m0n0wall] CENTOS 4 problem with 1:1 NAT
To: m0n0wall at lists dot m0n0 dot ch


I'm mot very experienced with this stuff so I apologize in advance
for my ignorance.

Does CENTOS not like NAT?

I am having trouble doing 1:1 NAT with a CENTOS 4 server. The strange
part is right next to it is a Fedora FC3 server which works fine. I
have tried switching internal and external IPs on the CENTOS server
but it consistently looses it's connection with public internet the
moment I apply 1:1 mapping to it's IP.

Here is some more information about my setup if you are still reading.

I have M0n0wall 1.2 setup on a Soekris 4501 and the basic setup is
WAN - Static IPs (32 IPs)
LAN - DHCP on the subnet

Everything works great.

I want to add a DMZ with a couple servers on the OPT1 interface. So I
set it up with the name DMZ and setup DHCP and static mapping for the

DMZ interface setup
    - DHCP on the subnet
    - I mapped the two servers to fix IP address with static mapping
by mac number

Still everything is fine, The servers are picking up the correct IP
address and they are able to get to the internet. When I do 1:1 NAT
mapping from a public IP within my assigned range the servers the
CENTOS server looses connectivity. The Fedora server is fine and
viewable from out side my network. I have tried assigning the CENTOS
server to different internal IPs and mapping it to different public
ones but the same thing happens.

Any tips would be greatly appreciated.


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