topic Re: CGNAT - how does it work? in Discussions & Feedback

CGNAT - how does it work?

LW687 — Wed, 19 Aug 2020 16:41:45 GMT

Hopefully one of you techies our there can help me.

By the sounds of it, o2 use CGNAT over mobile data?

How does CGNAT work, and how many users would be under one ‘public’ IP address at the same time on o2?

What exactly is CGNAT?

Re: CGNAT - how does it work?

MI5 — Wed, 19 Aug 2020 16:43:40 GMT

https://en.wikipedia.org/wiki/Carrier-grade_NAT

Re: CGNAT - how does it work?

LW687 — Wed, 19 Aug 2020 16:59:52 GMT

@MI5 this is why I love this community, because other people do the research for you

Still doesn’t make sense to me, how can each ISP/carrier know which individual user is browsing, when they are under the same IP as other users.

How many users would usually be behind one IP?

Re: CGNAT - how does it work?

MI5 — Wed, 19 Aug 2020 17:32:07 GMT

@LW687

That's got something to do with DNS https://en.wikipedia.org/wiki/Domain_Name_System