Using Static IP's with or without IP Passthrough

Hi there, techatyou. 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 setup 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.

Aaron, AT&T Community Specialist

Hello Aaron,

Thanks for the reply.  I have no trouble when using the provided ATT router in the way discussed in the links provided.  The problem is when connecting a third party router how do I now route those IP's back through so I am use my static IP's just like I do with the ATT router.  Please refer to the orginal post for troubleshooting tried.  

Hi there, techatyou. Thank you for reaching back out to us.

After looking into your concern further, we recommend that you contact Tech Support 360 for the proper assistance. You will be able to reach them at 866.442.2827. They are able to assist with the following:

• Computers
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• Personal electronics
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• Software applications (installation and setup)

If you need further assistance, please let us know. We are here to help.

Thank you for contacting AT&T Community Forums.

Aaron, AT&T Community Specialist.

If you are truly purchasing static IPv4 addresses then you need to use the Cascaded Router option on your AT&T gateway and have it point to your ASUS device.

Thanks Guys i'll look into both.  and post my results and configuration so others that run into this have the information they need. 

@JefferMC Hey Jeffer!  You seem to have the most knownledge on issues like this can you please help.  The Cascaded Router i've tried and it did not work for me I also attempted on the ASUS WAN side changed the WAN type from symetric to full coned this seems to not matter as the running ping did not change. As for truely leasing a IP block, yes I do its a /28.

Config tried for Cascaded Router

IP Passthough on with dhcp which gave the secondary (ASUS) router the normal public IP not one in my block.

ASUS Config attempts 

WAN Type: symetric and then full coned with the above settings on the att router still.

What are your objectives for your Public Static block?  What devices do you want to have one of the Static addresses?  Will you also want the Dynamic Public used?  How are you at doing custom routing rules in the ASUS router?

@JefferMC  

What are your objectives for your Public Static block? 

Would like to be able to passthrough and used the Static IP's on servers themselves.  Like how I do with the ATT router.   Currently right now i have just placed the ASUS routers into AP Mode and using the ATT router again. 

Would be great to know if you know a way but seems this may be what i'm going to have to stick with. 

What devices do you want to have one of the Static addresses?
One? i'm assuming we can only have one?

How are you at doing custom routing rules in the ASUS router?

Attempted static routes.

If you want another router to handle IPs on to-be-public servers behind that router, then your only choice is to use Cascaded Router.  That will give control of the subnet to your router.  You can leave its "WAN" IP as a private IP in the Gateway's LAN subnet, and the traffic will route through it to the Gateway and out without the header being mangled by NAT/PAT.

If you also want your same router to have the Dynamic Public Address and route your normal Internet clients, you can turn on IP Passthrough as well. I don't know of anyone who has done that successfully, though.  This means that your router needs to understand that it has the public dynamic address AND is responsible for NATting traffic to it and handling the response, plus responsibility for routing the public subnet traffic, this is not normally something a consumer router UI will help you set up.  Most routers would let you do it via shell commands, though, but it's non-trivial.

You could also consider allowing the router to NAT traffic to one of the public statics and route that out the normal private IP to the Gateway.  Similar in configuration difficulty to the previous scenario.