> On 29 Oct 2020, at 07:50, Matt Darfeuille <m...@shorewall.org> wrote:
> 
> On 10/29/2020 6:30 AM, Aero Maxx D wrote:
>> Hello,
>> 
>> I’m new to this group and to shorewall also.  I’ve read the installation and 
>> configuration guides for two interfaces, but I’m not sure they match the 
>> setup I have at home.
>> 
>> I currently have the following two pieces of DCE equipment, and would like a 
>> PC running shorewall between them.
>> 
>> 1. Cable Modem/Integrated router from ISP.
>> 2. Third party router I bought myself.
>> 
>> I currently have the Cable Modem from my ISP in modem only modem, and a 
>> single link to the third party router.
>> 
>> The IP issued to the cable modem is dynamic so may change I’m unsure whether 
>> this has happened or not.
>> 
>> So I’m wondering if I should use the ISP issued cable modem and router as 
>> intended, and have a single link from it to the shorewall PC and a single 
>> link to my third party firewall on a different 192 subnet.
>> 
> 
> That should do it.
> 
>> The two interface configuration guide uses 10 subnet and I’m not going to 
>> have that many devices connected in my house.
>> 
> The 'snat' file at (1) is configured to masquerade RFC 1981 addresses.
> This is to provide users to have a working configuration to start with.
> 
> 1)
> https://gitlab.com/shorewall/code/-/tree/5.2.8-base/Shorewall/Samples/two-interfaces
> 
> -- 
> Matt Darfeuille <m...@shorewall.org>
> Community: https://sourceforge.net/p/shorewall/mailman/message/37107049/
> SPC: https://sourceforge.net/p/shorewall/mailman/message/36596609/
> Homepage: https://shorewall.org
> 
> 
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Thank you David and Matt for the responses, I’ll have a dummy run if that’s 
possible virtually with some virtual machines and have a go.  If not I think I 
have a unused old router that I could use to simulate what I want to try 
without preventing the other devices on my network from accessing the internet 
whilst I figure stuff out!

Thanks,

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