Static IP address 2 routers ATT Passthrough mode

The AT&T gateways only support one cascaded router with the static IP service.

So you can either have one router be the recipient of the static IP addresses (Cascaded Router mode) and have a second router then daisy chain off the first.

Or you can use the per-device address allocation (Public Subnet mode and DHCP fixed addess allocation), assigning one of the static IP to one router and another static IP to the second router (and then use NAPT on each of those routers if you want additional devices daisy chained off those routers).

Each is configured differently in the AT&T gateway.

Hi there @godboutd, We understand how important it is to get help with configuring your equipment using static IPs. 

When setting up multi Static IP addresses, you’ll get a Dynamic WAN address. It acts as a gateway for the static IP addresses to reach the network. AT&T doesn't automatically assign static IP addresses to devices connected to the Dynamic WAN. Also, depending on the block size that you purchased, you would only be able to use a certain amount of usable addresses. 

We also have a page where you can review the best way to set up an AT&T Internet Static IP. Near the bottom of the page, there is an option on how to configure routing using your own equipment. 

Please let us know if you have any additional questions. We are here to help.

Johan, AT&T Community Specialist

@ATTHelp @Per my first attempt I have a block of static up addrees

plesse read my question again

I need to know if I can run two routers off the att box and get both them part of my up block 

also want to make sure the att router is not blocking any traffic 

@thechef1 

That is what I thought 

for the second option Al traffic will pass to the routers correct since I have all the firewall turned off?

Do not know. Some of the AT&T gateways have had problems doing that in the past (e.g., with ping, select ports, etc.).

It also depends on what you mean by "I have all the firewall turned off".

In general you will need to also enable "Allow Inbound Traffic"or create pinholes, depending on your gateway,

You can scan the forums here for help from others who have done this in the past (e.g., do a Google search).