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Double NAT, Time Capsule

Hi,


I have had my Time Capsule set up for a couple of weeks now and it works fine, but slow. I recently looked at the airport utility and it tells me that it has a double NAT, which I do not understand how to get rid of. The Time Capsule is connected to a BT infinity homehub 3 if that helps???


Any help would be appreciated, thanks.

Chris

Posted on Aug 30, 2012 7:35 AM

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Posted on Aug 30, 2012 8:14 AM

Hi - the BT infinity is a fully functional wifi router providing DHCP and NAT - your TC is trying to do the same thing so your are getting the double NAT message - to correct this, you have to use the bridge mode on the TC - to do this, open the Airport Utility and click on the inernet tab - the internet connection should be via ethernet - connection sharing should be off (bridge mode) - on the TCIP/IP tab it should be using DHCP - and since your are connected via ethernet you should use "create a wireless network" with the same wireless network name and security as your BT infinity - I hope this helps


Charlie

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Question marked as Best reply

Aug 30, 2012 8:14 AM in response to chizholm

Hi - the BT infinity is a fully functional wifi router providing DHCP and NAT - your TC is trying to do the same thing so your are getting the double NAT message - to correct this, you have to use the bridge mode on the TC - to do this, open the Airport Utility and click on the inernet tab - the internet connection should be via ethernet - connection sharing should be off (bridge mode) - on the TCIP/IP tab it should be using DHCP - and since your are connected via ethernet you should use "create a wireless network" with the same wireless network name and security as your BT infinity - I hope this helps


Charlie

Jan 5, 2013 10:16 AM in response to chizholm

While it's possible to use Bridge Mode to solve the warning like CRMDVM suggests, either ignoring it, or enabling Bridge Mode results in the Time Capsule not actually in essence, 'running' the network, as well as leaving you with an extra box (the HomeHub) you probably don't need.


Since it's a much better router than the HomeHub, I'd recommend that unless you particularly love the HomeHub, you use the Time Capsule to share the internet connection instead, which will allow you to pop the HomeHub in a drawer and just use the Openreach modem and Time Capsule, unless BT are particularly interested in having you get it out for support purposes at some point in the future etc.


If I understand correctly, you currently have a white BT Openreach modem which connects to the HomeHub, with the Time Capsule connected to the HomeHub via another cable.


Two questions to help me figure out how to best help you switch things over (if you want to etc.):


  1. Do you currently connect to a wireless network the HomeHub makes, or one the Time Capsule makes?
  2. If you open Airport Utility, select the Time Capsule, then click the Wireless tab, can you tell me what Network Mode is selected?

Jan 5, 2013 4:50 PM in response to chizholm

Thanks for helping me fix this issue, but recently we've built an extension onto our house and are going to use the TC to extend our range on the home hub as nether signal reaches the other side of the house now (HH & TC are placed in near front of house) but I don't want to move the home hub and open reach Ect.

So can you help me again turn my TC into wifi range extender and will it still back-up my data from iMac which is located next to the home hub?

Jan 5, 2013 6:13 PM in response to chizholm

If I'm frank, wireless range extension isn't too good, and between different companies products? It's basically a recipe for bashing your head against the wall in desperation at how impossible/full of fail it is.


Though it'll require buying some new stuff, the best and easiest way to get what you want is likely to cut the Home Hub out of the equation entirely and to buy an Airport Express and a couple of powerline network plugs to make your network look like it does below.


Openreach VDSL modem --Ethernet--> Time Capsule --Ethernet--> First powerline plug


Then wherever the signal is both needed and terrible/nonexistent:


Second powerline plug somewhere else --Ethernet--> Airport Express


The powerline plugs use your existing wiring to essentially give you the advantages of having a wired connection without the annoyance of having to run new cable everywhere. The Airport Express can do wireless bridging, but the performance will be quite a bit lower and you'll not have the freedom to put it in a total connection blackspot.


Oh, and as a nice bonus, providing you make sure you plug the Ethernet cable for the Airport Express into its WAN port, in my experience Airport Utility quickly twigs exactly what you're trying to do and does pretty much all of the work for you, which is nice of it.


In terms of what powerline adapters to get, I was researching this recently and am pretty sure I'd go for a couple of Solwise NET-PL-500AV-PIGGY adapters:


http://www.broadbandbuyer.co.uk/Shop/Specifications.asp?ProductID=12622

May 25, 2013 5:33 PM in response to CRMDVM

Hi,

I found your answer to:


CRMDVM wrote:


Hi - the BT infinity is a fully functional wifi router providing DHCP and NAT - your TC is trying to do the same thing so your are getting the double NAT message - to correct this, you have to use the bridge mode on the TC - to do this, open the Airport Utility and click on the inernet tab - the internet connection should be via ethernet - connection sharing should be off (bridge mode) - on the TCIP/IP tab it should be using DHCP - and since your are connected via ethernet you should use "create a wireless network" with the same wireless network name and security as your BT infinity - I hope this helps


Charlie

very helpful but my problem is a little different. I am using a netgear router conected directly to the modem and then im using a time capsule to make a roming connection through my house. I solved my first problem by setting it as bridge mode but now I would like to know if that time capsule with that settings can transmit to a airport express I have on the other side of my house. Thanks.

Double NAT, Time Capsule

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