What is CG-NAT?

What is CG-NAT?
Published on: 08-04-2021

What is CG-NAT?

CG-NAT is a method used by internet service providers, ones like OCCOM for sharing a single unique public IP address with multiple users. This allows them to access the internet without interruption. Basically, your router is assigned private IP address rather than using a public IP address.


Why is OCCOM opting CG-NAT?

We are running out of IPv4 addresses and are planning on moving all our customers over to IPv6 addresses. Until we get there, though, we have decided to use the CGNAT method as it has the least impact on a majority of OCCOM’s customer. Currently OCCOM is using this method to share a current unique public IPv4 addresses that has been deployed to multiple customers and trying to extend the life IPv4 within the network.


How will this affect me?

Basically, the modem or router you have will use a private IP address and when you access the internet then you will get transferred across a shared public IP address. This will not affect to most of our customers. Browsing internet would stay as usual with the only difference that your router or modem will be assigned with a different IP address. If you happen to purchase a static IP address this will not make any difference in your IP address and it will remain same.


What is an IP address and NAT?

An IP address is a unique address that identifies a device on the internet or a local network. IP stands for "Internet Protocol," which is the set of rules governing the format of data sent via the internet or local network. Internet Protocol works the same way as any other language, by communicating using set guidelines to pass information. All devices find, send, and exchange information with other connected devices using this protocol. By speaking the same language, any computer in any location can talk to one another. IP addresses are of two types:


Private IP address:

Every device that connects to your internet network has a private IP address. This includes computers, smartphones, and tablets but also any Bluetooth-enabled devices like speakers, printers, or smart TVs. With the growing internet of things, the number of private IP addresses you have at home is probably growing. Your router needs a way to identify these items separately, and many items need a way to recognize each other. Therefore, your router generates private IP addresses that are unique identifiers for each device that differentiate them on the network.

Public IP addresses

A public IP address is the primary address associated with your whole network. While each connected device has its own IP address, they are also included within the main IP address for your network. As described above, your public IP address is provided to your router by your ISP. Typically, ISPs have a large pool of IP addresses that they distribute to their customers. Your public IP address is the address that all the devices outside your internet network will use to recognize your network.

NAT is a technology that has helped to extend the life of IPv4 by sharing one public address to multiple private addresses, this is what allows you to get online with all of your devices at home without having a unique and expensive address for each device.


What about IPv6?

OCCOM is committed to delivering IPv6, currently tests are being carried on for the deployment of IPv6 on selected connections and we look forward to sharing more news about this deployment when it is ready for distribution to our customers. Until IPv6 is ready for deployment OCCOM will be sharing IP addresses using CG-NAT.

OCCOMOptical Communication Expert

Occom is an Internet service provider dedicated to delivering faster fibre and mobile services and faster support. Occom has been praised by tens of thousands of satisfied residents and businesses, and our products have attained commendation from industry experts. As one of the fastest growing telcos endorsed by top global and Australian financial media, Occom has set the bar for exceeding Aussies’ expectations towards customer service. Occom’s young, passionate and professional team will keep on pushing the boundary for what is possible in the future.

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