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Sun, Jan 20, 2019 5:01 PM
We are signed with ATT DSL service. Does ATT provide static or dynamic public IPs?
ACE - Expert
2 years ago
IP address assignment is dynamic though it may be possible to pay for a static IP address. So yes, the IP you see from whatsmyip.org is dynamic. Even though your IP address is dynamically assigned, there is a good chance your IP address won’t change. I have no idea what ATTCares was talking about. I have over 30 years experience in IP networks and none of that made any sense to me. I think the static IP’s they are talking about is the IP’s used on your home network.
When you connect to the AT&T network you will get a Dynamic WAN address. The Dynamic WAN address is then associated with your static IP and 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. In order to use your static IP addresses you will need to contact us to have your equipment configured. Learn about static IP addresses, how they differ from dynamic IP addresses, and why you might need one.
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Lafayette, AT&T Community Specialist
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I’m not sure I completely follow you. For example, if I go to whatismyip.org, it would show that my public IP address is 126.96.36.199 (just as an example). Is this the dynamic WAN you are referring to?
Thanks for the clarification. This is a critical piece of information when doing any home networking with registered domain names.
Yeah the static IPs they were referring to must have been the LANs, such as the 192.168.1.254 gateway.
The MAC addresses of all our gateways are assigned blocks of Public iP addresses by AT&T. Technically, when you boot the gateway in its default configuration, it receives a “dynamically” assignable IP from your designated block of addresses. But AT& could change that table at any time. That said, it rarely happens and most of us are left with our dynamic address that rarely changes.
The only way to have a static address (guaranteed) is to pay for the fixed address and then change your gateway’s configuration to specify that bank of public addresses in your subnet. In depth info found here. https://forums.att.com/t5/AT-T-Internet-Features/AT-amp-T-Internet-Static-IP-How-do-I-setup-and-is-there-a-need/td-p/5131385
Thanks. So then if someone is running a webserver from their home, and they are using a registered domain name, it would probably be safer to use a dynamic dns service from their registrar. If not, the webserver would go down if the the public IP happened to change.
There are a some good providers of this service, including:
thanks. So then if someone is running a webserver from their home, and they are using a registered domain name, it would probably be safer to use a dynamic dns service from their registrar. If not, the webserver would go down if the the public IP happened to change.
Using DynDNS (and similar services) is a very effective solution for those wanting to avoid the extra expense of paying for public static IP addresses. For a single IP address, DynDNS meets the need of a cost-effective "static-like" solution. I've had success in the past creating VPN connections using DynDNS.
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