On Tue, May 07, 2019 at 08:25:52AM +0200, Stijn De Weirdt wrote:
> hi all,
> 
> i'm struggling with a network setup i want to achieve, and i'm not sure
> what shorewall features i need to use (or if it can be achieved at all).
> 
> i want to setup a dual gateway of some sort: i have a linux host with 3
> network interfaces:
> eth3 is connected to private network, and i need NAT for this network
> eth8 is connected to the ISP
> eth6 is connected to a local public network. this host supposed to be
> the gateway/router for this subnet
> 
> what i now want to achieve is that i can use the gateway IP of eth6
> (*not* the ISP ip from eth8) for the NAT and also that i can setup port
> forwarding on the the IP of eth6.
> 
> trying to wrap my head around the issue, i think i want to tell
> shorewall to not consider eth8 as part of the FW, and use it for routing
> to eth6 and (hopefully) still allow filtering.
> 
> many thanks for any tips (and apologies if this makes no sense ;)
> 
I am not sure that I fully understand what you are describing.  However,
it seems like it lines up with the three-interface HOWTO [0].  In the
terms of the HOWTO, your interfaces would be like this:

eth3 - LAN
eth8 - Internet/WAN
eth6 - DMZ

At least, that is what I think you are trying to accomplish.  Have a
look at the HOWTO and follow-up if you still have questions.

Regards,

-Roberto

[0] http://www.shorewall.org/three-interface.htm

-- 
Roberto C. Sánchez
http://people.connexer.com/~roberto
http://www.connexer.com

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