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Double NAT?

Hello, this will be my first post here.

I have UTM9 installed on a mini itx pc. I have it setup behind a standard-issued AT&T all-in-one modem\router\wireless access point device.

I also have various network devices like printers and nas etc..,.

So its like this

AT&T ROUTER > Astaro UTM9 > SWITCH > DEVICEs

Now, I would like the att router to perform dhcp,nat etc... and I would like to make the astaro work without nat. This is because if anyone in my household would not like to be filtered, they may connect directly to the att router and be fine. But other devices could be filtered via the utm.

So far, I have found a few posts about something like this, where the solution is to set the UTM in bridge mode. How do I do that if I only have two nics? Won't I need a third nic for administration? (only have two nics)

Or if I were to keep my double nat, how do i share devices like a printer between the two routers\networks?

thanks, i appreciate the help.


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