Is my connection using CGNAT?
I am troubleshooting something unrelated, and someone helping me wants to know if my ISP is using CGNAT. I'm not sure what this is, but in any case, how do I find this information out?
Forum Discussion
4 Replies
AFAIK VM UK do not use CGNAT but VM IE do.
Carrier-Grade NAT (CGNAT), also known as large-scale NAT (LSN), is a type of network address translation used by Internet Service Providers (ISPs) to manage the shortage of IPv4 addresses. Here’s a simple breakdown:
Purpose: CGNAT allows multiple customers to share a single public IP address. This is crucial because the pool of available IPv4 addresses is limited and nearly exhausted12.
How It Works: In a typical home network, your router assigns private IP addresses to your devices and translates them to a single public IP address when accessing the internet. CGNAT does something similar but at the ISP level. It translates private IP addresses from multiple customers to a shared public IP address13.
Benefits:
Drawbacks:
Transition to IPv6: CGNAT is considered a temporary solution until IPv6, which has a much larger address space, is fully adopted2.
Your Hub is assigned a public IP Address, i.e. traffic can be routed to it over the internet; this is not possible with CGNAT where private IP Addresses are used.
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Have I helped? Select Mark as Helpful Answer or 🖒 Kudos to say thanksI know it's a bit late. But I thought I reply with an straight forward answer to this.
No. Virgin Media does not use CGNAT for fiber optic. I know this as I had no issues port forwarding my plex streaming and pc for Web hosting.
If you are having issues, consult a pc network advisor or YouTube videos.
