by ChrisC68 Investigator
Investigator

Double NAT - Any way round it?

Hi, we use a 4GEE Home connection for our main internet connection due to issues with the phone line service where we live.

 

While it has been largely fine, I've just encountered an issue while setting up Plex to manage our houshoild media. 

it works well internally, but I can't connect remotely due to issues with Double NAT. This is, I am told, because of the way the EE connection is set up.

Apparently I need a static IP{ address to set up port forwarding (this is getting to the limit of my knowledge!) but that is noit something available? 

 

Any way around this situation so I can access this remotely.

19 REPLIES 19
by Grand Master
Grand Master

Re: Double NAT - Any way round it?

@ChrisC68: EE mobile network uses Carrier Grade NAT (CGNAT), which means that you don't get your own public IP address but share it with other users. So you can't be uniquely id'ed on the Net.

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If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

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by
EE Employee

Re: Double NAT - Any way round it?

Hi and welcome to the community @ChrisC68

 

Please do see the explanation given above by @XRaySpeX.

 

Many thanks,

 

Lee

by ChrisC68 Investigator
Investigator

Re: Double NAT - Any way round it?

Thanks for the explaination.

 

So from that I assume you are saying there is no way around it?

by
EE Employee

Re: Double NAT - Any way round it?

by Grand Master
Grand Master

Re: Double NAT - Any way round it?

You might if the device allows for Dynamic DNS (DDNS or DynDNS).

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If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
by ChrisC68 Investigator
Investigator

Re: Double NAT - Any way round it?

Which device are you referring to XRaySpeX?

 

I'm using a Huwawei B593 router and trying to make an inbound connection to Plex server which is running on a dedicated mac mini on our internal network. 

 

Plex server needs an inbound connection to port 32400 (if I understand what I'm reading correctly). The solution as I understand wiuth Double NAT is to set port forwarding on the addional router (the bit EE have - CGNAT?). But I assume that is not possible.

 

A lot of the support info references situations where the double NAT comes from where there is a signle connection into a building and then further routers inside the buildingf - a shared site perhaps.

 

Heres a snippet from the plex site:

 

In order to forward a port for Plex Media Server, you'll need three main pieces of information:

1 - WAN/External Port: Port 32400 (TCP) is default, but you can generally use any available port in the 20,000 to 50,000 range.

2 - LAN/Internal Port: This will always be 32400.

3 - IP Address: The local IP Address of the computer running the Plex Media Server. This is what you did above.

 

Important: While you can choose any valid WAN/external port number you desire, the mapping for the LAN/internal port must always be 32400 (TCP).

Tip!: Remember that we're talking about forwarding ports for app access here. This is not the same thing as enabling remote management of your router itself.

You want to map the WAN/External Port (TCP) you choose so that it points to LAN/Internal Port 32400 (TCP) for the Server's local IP address. Consult your router's manual for instructions on how to forward a port. There are also numerous online resources you can use.

 

Its point 1 I can't do anything about if I understand correctly.

by Grand Master
Grand Master

Re: Double NAT - Any way round it?

The 4GEE Home router.

__________________________________________________________________________________________
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
by ChrisC68 Investigator
Investigator

Re: Double NAT - Any way round it?

Hi,

 

I think it does, but would not know what top do with it.

 

Here's a screenshot of a DDNS section on my router - is this what you mean? 

Screen Shot 2017-12-31 at 22.49.02.jpg

If so, what do I need to do?

by Grand Master
Grand Master

Re: Double NAT - Any way round it?

Yes, that's what I mean.

 

I'm not familiar with DDNS. I'm only aware of their existence for such cases. I'm just providing you with a clue & expecting you to research it.

 

You need to select & sign-up with a DDNS provider who should take it from there.

__________________________________________________________________________________________
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
by ChrisC68 Investigator
Investigator

Re: Double NAT - Any way round it?

Thanks, I appreciate your help.

 

I will do some 8nvestigating and see if it offers a solution.

by hebe4g Contributor
Contributor

Re: Double NAT - Any way round it?

I don't understand how DDNS would work given an IP assigned is shared?

 

 

by Grand Master
Grand Master

Re: Double NAT - Any way round it?

@hebe4g: The DDNS provider assigns you a unique hostname by which others can address you.

__________________________________________________________________________________________
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
by hebe4g Contributor
Contributor

Re: Double NAT - Any way round it?

Yes, but in carrier nat enviroment, how can it route back? 

by Grand Master
Grand Master

Re: Double NAT - Any way round it?

@hebe4g: Your system is constantly sending out "probes" to the DDNS who replies to the latest of those.

__________________________________________________________________________________________
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
by andyroochoo Investigator
Investigator

Re: Double NAT - Any way round it?

The use of a VPN with static IP was suggested.
by andyroochoo Investigator
Investigator

Re: Double NAT - Any way round it?

Did you ever solve this issue?

by Grand Master
Grand Master

Re: Double NAT - Any way round it?

@andyroochoo: DDNS was suggested.

__________________________________________________________________________________________
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
by Grand Master
Grand Master

Re: Double NAT - Any way round it?

@andyroochoo: Was it? I don't see it.

__________________________________________________________________________________________
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.

ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC
Highlighted
by hebe4g Contributor
Contributor

Re: Double NAT - Any way round it?

Well I was certainly never be able to get it work unless assigned my own IP address, which seemed to happen very occaisionally.

 

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