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Sunday, November 20th, 2022 12:49 AM

AT&T Fiber IPv6 inbound

I am trying to connect IPv6 inbound from my AT&T Fiber to inside my network.   My Fortinet 60E firewall is getting the home network address (prefix delegation) not the external IPv6 address of the AT&T gateway.   IPv6 works outbound from my network.   How can I get it to work inbound? 


Community Support


207.9K Messages

3 months ago

Hi there, SCSIRAIDGURU1. We understand that you are trying to connect IPv6 inbound inside your network. We can look at that. 


We see that you are using a 3rd party firewall or router with the AT&T equipment. We do have some recommendations. They are: 

  1. IP  Passthrough: When it comes to IP Passthrough all that means is the AT&T equipment is still first in the network, but it is kind of like bridge mode( back in DSL days). It takes the IP address that is supposed to be addressed to the AT&T equipment and gives it to the 3rd party equipment to manage. 
  2. Static IP's: Static IP's are a great way to manage inbound and outbound traffic. It is also good for remote monitoring for things such as, DVR's for security cameras, and things that require you to log into them, when you are away from your home network. 

Now we do have a few questions for you. These questions will help us determine the best support possible.

  1. Are you running a business and have a business account? The reason why we ask that is, we do have a business support team available to help you.
  2. What is your main goal? If we could have some more details on what exactly is your main goal is, then we can point you in the right direction to get the best support.

If we could have the answers to the questions above, this will help us make a determination on what will be the best course of action to meet your needs. 


Looking forward to hearing from you. 


Matthew, AT&T Community Specialist


ACE - Expert


31K Messages

3 months ago

Matthew....  FYI, IP Passthrough works for the public dynamic IPv4 address.  It has no effect whatsoever on IPv6.

Purchasing a static block of IPv4 addresses may (or may not) also assign a corresponding block of IPv6 addresses, I'm not so sure about that.  

However, OP wants to know about IPv6.  Let's stick to that, shall we?

@SCSIRAIDGURU1 , seems like we've already covered this round with you.  The Public Dynamic IPv6 address for the Gateway has nothing to do, and needs nothing to do, with the IPv6 address blocks you can get delegated to you.  The space will be different.  The Gateway can block IPv6 traffic from outside, and can be told to let it pass, depending on the Firewall and Advanced Firewall settings.

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