Public IP

Home Network > Subnets and DHCP.

what do you mean properly use? your assigned 1 public ip address 

By "Nokia Fiber Modem", do you mean the BGW320-505?  If so, why don't you just say so?  If not, what did you mean?

Are you paying for an additional Public Static Block of IP addresses in addition to the Dynamic Public address that comes with service?

If so, what exactly do you intend to do with these IP addresses (e.g. what will you assign them to, how do you want them managed/routed etc.)?  There are two different ways to configure an AT&T Gateway depending on how you wish to use the IPs.

The above questions are based on the assumption you're asking about IPv4.  If IPv6, that's a whole different discussion.

Sorry for not providing enough information.

We bought and additional 5 public IPs. Behind the modem we have a PFSENSE - Router/Firewall at the edge - it will be handling our DHCP and other services required on the LAN. There is an NVR for our cameras, that needs to be monitored remotely. Does the modem have a bridge function?

For now I only want the public IP on the PFsene box then I can port forward to the NVR.

The AT&T Gateway has an IP Passthrough mode, where it can hand the its Dynamic Public IP to a router behind it and it won't do NAT for traffic coming from it and will forward all traffic it doesn't have another session for to that router.

Your two choices for how the Gateway handles the Public subnet are:

1) Public Subnet mode - the Gateway assigns itself the router (.6) address of the subnet and will route for .1 through .5 on the Gateway's LAN.  You can have it assign the 5 IPs via DHCP or you can statically assign them, etc.  You can only have one of these IP address per MAC on your LAN.  (You can do this at the same time as IP Passthrough).

2) Cascaded Router mode - You give the Gateway the local IP of a router on its LAN.  It will route traffic from the Internet for the subnet to this local IP and it will accept traffic from that IP to the Internet that has a source IP from the subnet.  Your router is responsible for managing the .6 address on its LAN (as necessary) and routing for the public subnet.  [This device can also be assigned as the IP Passthrough target... meaning it needs to handle both NAT for the Dynamic Public, if you want that, and routing the static subnet.  This is accomplished by giving 0.0.0.0 as the local IP of the cascaded router]

Option 1 is what will work best at this site.  Where in the AT&T Gateway GUI to I find this setting?

Thanks I will give it a shot