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4G CGNAT is frustrating

I have a difficult problem with getting access to my 4G connected network remotely. Lets call that point A. My Point A computer is connected to a 4G network that has CGNAT from the ISP. That means the public external IP address of that computer is shared with others and is given an internal ISP from within the ISP.

This creates alot of problems as it is not possible to run services like VPN server RDM etc as I have 0 control over the ISP NAT. I have contacted the ISP and they are not able to give a static unique IPv4 nor IPv6.

Then we have point B. I need point B to be able to use the external IP of point A.

I don't want to use VNC because restricting data on 4G is crucial. I only want to be able to visit web servers with the external IP of point A on my point B computer.

I have full access to point B NAT/Router and it has a static IP.

Bottom line is I need to be able to use point A external IP on point B because the websites I visit are restricted to the external IP of the point A 4G ISP.
 

drsox

ULTIMATE Member
In that instance I would use a computer, router or virtual machine running ZeroShell at either end and setup some VPNs and funky routing.

I regularly have to do this at customer sites where they have managed routers and it is impossible to get settings changed or impractically slow to get settings changed.
I have a ZeroShell server at my home* with ports forwarded through to it.
I then have ZeroShell at my customer site and _it_ makes a connection out to my home.

I can then set a machine to have the default gateway of the VPN machine at my home which then NATs down the VPN to the customer and that could also have NAT enabled to then allow egress to the internet via the customers normal ip / router..

*It isn't, it is in a datacenter but for the purposes of this example it is better to pretend it is at my home.

It sounds complicated and I've not explained it well but it is the way that works best for me. You do need to understand and be confident in setting up routes etc.

Tom - www.mouselike.org
 

Mark.J

Administrator
Staff member
ISPreview Team
Does it have to be an IP address? I mean, could you connect using a hostname instead after DNS translation? If so then you could always try using a Dynamic DNS service that adapts a single host/domain name to your IP address as and when it changes.

A good D-DNS solution will cost a small amount of money to run, but there are often free solutions and these can be worth trying. Here are a few options:

https://www.dynu.com/
http://dyn.com/dns/dyndns-pro-free-trial/
http://www.dnsdynamic.org/
https://www.duckdns.org/
http://www.noip.com/

I'd probably give No-IP a try first as they've been around since the good old days of DynDNS, which sadly shut down in 2014. However a Dynamic DNS does rely on you keeping the service up-to-date with IP changes, usually manually or via a small automated app/software. In that case a more complicated routing method, such as the one Tom proposed, may be a better long term solution.
 

DTMark

ULTIMATE Member
We use EE 4G as our main connection and we have the same issue. CGNAT basically renders large parts of the internet completely useless and simply isn't workable.

We get around it by taking a third party VPN with fixed IP service. That's actually set in our router, so everything in the house presents externally as the same IP.

Although I haven't needed to set this up, I did once get this working in reverse e.g. you can dial in (RDP) to the external fixed IP. IIRC it required me to set a port forwarding setting with the VPN provider.

With that in place it's like any other connection with a fixed IP and the CGNAT issue falls away.
 
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