No DNS and Double NAT

Hello, I've recently encountered a very frustrating bug in my system that I could use some help troubleshooting. I've read several similar posts, some are resolved while others are not, however none of the resolutions have worked for my situation. Here it goes:
I have an old macbook pro, a new macbook air, a white macbook and 2 iPhone 4s's all connected to the internet via WiFi through an AirPort Extreme. The AE is connected to a cable modem which has internet service through Cablevision in NY. There is also an AT&T Microcell hooked up to the AE to boost my cell signal. All of this equipment has been working flawlessly together for a long time. Until recently. It could have started after an update, there have been several lately on all of the equipment including the firmware in the AE. Anyway, I'll be connected without any issues - all lights green and happy - when suddenly, the internet will drop off and the AirPort Utility will pop up and warn me that:
1) On the "internet" icon, it will say "disconnected"
2) On the AE icon, it says "No DNS server and Double NAT"
After a few minutes and nothing done on my part, the lights turn green, the internet reconnects and all is well again.
This happens frequently and is really beaching a nuisance. Due to the frequency of the disconnection, I can no longer download a large file, update, or anything. Streaming video is impossible.
So far, I have tried bridge mode and cycled the power in the order recommended to no avail. When I do that, the AE turns green, but the internet says "not connected". I have also read that there might be too many IP addresses which is not sitting well with my ISP, so I disconnected everything including unplugging the Microcell. Lastly, there are no other wireless phones or devises in the house. All to no avail.
I should also mention that this began occurring on my Time Capsule, which I replaced with the AE in an attempt to fix this issue.
Any help would be greatly appreciated.
Joe

Sounds very similar to what I've been trouble shooting for 2 months now, only I have DSL from AT&T and I don't see the Double NAT warning. My last post on the problem is here.
My only emergency solution for getting by day to day on the internet is to unplug the AE and connect one Mac directly to the DSL modem. There's no shared connection or WiFi. I looked at hosting WiFi from the Mac, but the only security available with that is WEP which isn't considered secure. Even with this set up, I think (seat of the pants) that there are quality of service problems.
I've replaced the Airport Extreme with 2 different new units and the DSL modem with a new unit to no avail. The Genius Bar and Apple phone support couldn't solve this, nor have 2 calls to AT&T support and one visit from an AT&T repairman.
I would like to know how to better test or quantify the poor quality of connection that seems to be the problem.

Similar Messages

Time Capsule - No DNS servers and Double NAT

I'm connecting an MBP running 10.5.6 to a Time Capsule which accesses Virgin Media broadband using a cable modem.
It has been working fine for 6 months, but I made some changes this morning to get my wireless camera onto the network, which broke the connection, and don't seem to be able to undo them.
The TC now flashes amber, and going into Airport Utility I get the following errors:
- No DNS Servers
- Double NAT
I've typed the DNS servers' IP addresses for my ISP into Airport Utility but it doesn't seem to recognise them. It also complains about a double NAT problem but I don't have another router assigning IP addresses.
I've also tried a hard reset on the TC, switched it and the modem off, waited 30 mins and then switched back on again - no luck.
Screenshots of all the settings on my TC from Airport Utility are here:
http://web.me.com/julianlove/Site/TimeCapsule.html
I'm not very knowledgeable about networking so any assistance appreciated.

Double NAT is an indication that you have two devices on the network both trying to perform routing duties. You only want one device doing this on a network. Solve the NAT issue and the DNS issue will go away as well.
What is the make and model number of the device that you call your "modem"?

Airport Internet Sharing and Double Nat Issue on the road

The Airport express is a very handy little piece of hardware that is particularly easy to pack in a luggage and carry along for those of us that are spending lots of time out of the office and home.
So here is the scenario when I travel and check in into an overseas hotel: I got two iphones, one local network, one my home network, and a Mac Book Pro, and soon, [when it finally ships], an iPad.
That makes it at least 3 MAC addresses in one room, and if i have any visiting colleagues to pack up a presentation, I will have more.
Usually hotels in Asia are well equipped with ethernet points in every room. The problem comes when I want to allow all my gears to connect to the internet.
I can use the Mac Book to share its ethernet connection while tethered to the plug, which not only turns it into an unlikely desktop, but also do not champion stability when it goes in stand by or sleeps and at times it even mixes up which is the access point to the net. Therefore this does not seem to be the best solution.
I can put the AE in bridge mode and plug it straight to the ethernet. But most hotels internet access are designed to charge per MAC address, so every time the router assigns via DHCP an IP to one of my gears it requires to accept new charges for that gear, even if they are all in the same room. This definitely does not seem right either.
Now if I configure the AE to share a public IP address and force it to ignore the double NAT warning, the AE light turns green but the internet sharing does not seem to work at all.
My two questions are:
1) Why can't the AE be configured like the Mac Book to have a simple "Internet Sharing" protocol that will be always live and not going to sleep or stand by like the laptop [As the AE is design to be always online as a wireless connection].
2) is there any way to make that "Share a public IP - *** double NAT" work?
Any feedback is welcome.
Thanks. M

Hi Bob,
thanks for your reply. Yes the only way to work it out on a typical hotel set up is to adopt the bridge mode and sometime the do waive your extra logs in. But I am not always so lucky and I often need to come up with less optimal solution.
This is a bit disappointing when you a have a AE in your luggage and you can't use it properly.
Yet my Mac can work the problem out effortlessly by just "Sharing a internet connection" with the only major limitation of being physically connected to the Ethernet cable.
Why can't the Airport Express do the same thing? Basically the AE could share the internet connection like the Mac Book, i guess introducing a secondary layer of NAT after the Hotel modem/router NAT setup [which is what the MAC Book is doing].
If AE can't do that at all then I guess soon we will just end up shelving it.
I wonder if this is an actual hardware limitation, MAC Book can wire TCP/IP flow to different sources on a double nat and AE can't, or this is just a software limitation and Apple could fix it with a firmware upgrade.
Any thoughts on this?

Creating Two Networks with Different Securities and Double NAT Error

I have a Time Capsule which is connected to my cable modem and an AirPort Extreme connected to my Time Capsule via the WAN port. I configured the AEBS to create a wireless network using WEP (I have a few devices that don't support WPA) so I can use two different wireless securities. The AEBS flashes the amber light and once I connect to its network, the AirPort Utility states that it has a "Double NAT" issue. I used my iPhone 5 to connect to the AEBS network and I can access the Internet just fine.
Is this issue one that can be resolved? If so, how? Or do I ignore the issue? If I ignore, what are the implications?
Thanks!

You need to configure the AEBS in Bridge Mode to eliminate the Double NAT error, which is slowing down your connection...and may likely cause other issues depending on how the network is configured.
If you do not know how to do this, we need to know what operating system you are using on the computer that is being used to configure and setup the AEBS.

DNS server with double NAT

Hi All,
We are in a process of migrating to a new ISP.
With the new ISP, we have no options but double NAT (one in Cisco router and one in Firewall).
In the test environment for the new ISP (double NAT) a desktop behind the firewall getting a dynamic IP address (which includes DNS server 192.168.0.3) resolved an external web site too long, but when I changed the DNS ip address to 8.8.8.8 it resolved quickly
as normal.
In the current live production every thing works as expected.
Any help/ idea would be appreciated.
Cheers

I would agree with Christopher.
You can also make sure that your DNS servers do not have public DNS IPs set in their IP settings. Instead, public DNS IPs should be set as forwarders. Also, make sure that you use your ISP DNS servers instead of other public DNS servers for external DNS
resolution.
For troubleshooting DNS lookups, you can use NSlookup with debug mode for more details. I have started a Wiki about that here: http://social.technet.microsoft.com/wiki/contents/articles/29184.nslookup-for-beginners.aspx
This posting is provided AS IS with no warranties or guarantees , and confers no rights.
Ahmed MALEK
My Website Link
My Linkedin Profile
My MVP Profile

Since cahnging FIOS Internet provider, which required a router to go in front of "AirPort" I have a blinking yellow on the AirPort and suggested editing in AirPort utility to cahnge from Double NAT to "Bridge Mode" my knowledge base is not clear as t

How do I clean up my new FIOS connection? I just cahnged ISP Fios and they reqquired a router of thier own in front of my AirPort Extreme. Since then I have blinking yellow light on the AirPort and AirPort utility keeps promting for an edit. Suggests canging from NAT to "Bridge mode". Obviuosly U have some internet or this post would not go anywhere, my knowledge base is not enought to feel comfortable with changing the settings. Correctly editing can be tricky, so how do I make necessary changes?

How do I clean up my new FIOS connection?
The FIOS router needs to be in Bridge Mode to prevent the Double NAT error from occurring when two routers are both fighting with each other for control of the network.
Unfortunately, the likely problem from the FIOS side is that FIOS support will either tell you that their router cannot be configured to operate in Bridge Mode, or if it can, they will not tell you how to do it.
But, it could not hurt to check with FIOS to see if anything might have changed recently in this regard, so your first call would be to FIOS support.
If you cannot change the FIOS router to Bridge Mode, the alternate plan would be to change the AirPort Extreme to Bridge Mode. If you are using the Guest Network feature on the AirPort Extreme at this time, that feature will not work correctly when the AirPort is set up in Bridge Mode.

TS1843 I am getting the following error messages- No DNS Server and Double SAT. Can anyone walk me through a fix?

Airport Express- No internet connection. I am getting the following error messages- No DNS Server and Double SAT. Can anyone walk me through a fix

Try putting these numbers in Network>TCP/IP>DNS Servers, for the Interface you connect with...
208.67.222.222
208.67.220.220
Then Apply. For 10.5/10.6 Network, highlight Interface>Advanced button>DNS tab>little + icon.
Might also put them in the Airport Express, no idea what Double SAT is!?

Double NAT Error with Airport Extreme and Airport Express

I have an Airport Extreme 802.11n base station which is connected to my DSL Modem/ Router via Ethernet. I have a MacPro which does not have an airport card installed so I bought an Airport Express 802.11n - which is connected to my MacPro via ethernet - and thus provides my MacPro with internet access.
Originally I had the APExtreme and the APExpress set up in a WDS - all worked well - my other wifi equipped macs and devices in the house connected to the network with no problem, but I did notice that the maximum throughput I was getting was 802.11g speeds - this is of course due to the overhead of the WDS.
I originally purchased these 802.11n devices because I wanted the higher throughput - so I decided to terminate the WDS and just have the APExpress (attached to my MacPro) "join" the wireless network instead of extending it - which works and I am enjoying the 802.11n speed.
So, I just upgraded a couple of my Macs to 10.6.2 and was going to start using "Back to My Mac" and I got the error that there is a double NAT address problem and that "Back to My Mac" won't work until this is resolved.
I know that going back to a WDS will resolve the double NAT problem - but I don't want to take the performance hit that goes with the WDS.
So, short of buying an Airport card for my MacPro (which would eliminate the need of the APExpress)
Is there any other way to resolve this double NAT problem besides WDS?
Thanks for any advice.

First of all thanks for your quick reply!
Connecting my MacPro to the Airport Extreme would be a serious pain as the DSL Modem and APExtreme are upstairs near the only connection point in the building to a phone line - and my MacPro is downstairs.
I suppose I could dig out a very long ethernet cable to perform the test. But before I jump through that hoop - please explain to me what you are trying to get at - in other words - what does it mean if this resolves the double nat error - and what does it mean if it does not?

My airport extreme has connected to a Tplink router, i set my AE in Create network, so i get a problem of Double NAT. How can i repair this probleme because i have to use TPlink for my IP TV and i want to use AE to creat my network and the guest NW.

my airport extreme has connected to a Tplink router, i set my AE in Create network, so i get a problem of Double NAT. How can i repair this probleme because i have to use TPlink for my IP TV and i want to use AE to creat my network and the guest NW. If we don't have a solution for this question, can i set my AE to use the IP TV and how??? I'm using a 4th Airport extreme

No, not unless it is simply a network connection.
How is your IPTV being provided.. if it is using a separate vlan or separate vpi/vci in the adsl connection. Who is your ISP?
Is the TP-Link ADSL?
Is the IPTV using a separate voice channel on adsl?
Or a different vlan.
Sorry but it is something where a definite answer is not possible unless you provide all the details.
The setups are unique to each ISP around the world..
Here is one for our local ISP.
http://www.avenard.org/iptv/Setup.html
He has a section on getting this working with apple router over wireless.. look
http://www.avenard.org/iptv/IPTV_and_Wireless.html
Google around and see if other people have had success.. the whole setup is tricky.. and it is hard if nobody has used it who actually understands networking.

My Time Capsule is giving me a warning that double NAT situation is occurring and recommends that I set it to bridge mode What is all this about please can it be explained in layman's terms and not martian thank you.

My Time Capsule is giving me a warning that double NAT situation is occurring and recommends that I set it to bridge mode What is all this about please can it be explained in layman's terms and not martian thank you.

You have two devices....the Netgear and Time Capsule both configured to act as routers on the network. You only want one device providing this service.
I suggest that you configure the Time Capsule in Bridge Mode as suggested to eliminate the Double NAT error. Unfortunately, the Guest Network cannot be enabled in this setting.
No other adjustments are needed and everything else will operate normally...and the Time Capsule will still be providing your wireless network signal.
Once the Time Capsule is configured in Bridge Mode, it would be an excellent idea to perform a complete power cycle on the network to allow things to reset properly.
Just power off all devices on the network in any order that you want
Wait a minute
Start the Netgear device first, and let it run a minute by itself
Start the Time Capsule next the same way
Continue starting devices one at a time the same way until everything is powered backup
The other option you have is to "ignore" the error and the light will turn green. The Double NAT error may...or may not cause some issues for you down the line. The next time that you update the Mac operating system, or update the firmware in the Time Capsule, it may likely change the Time Capsule to Bridge Mode automatically.
If your Guest Network "disappears", you will know why this happened, and you will have to manually configure the Time Capsule again in Router Mode to provide DHCP and NAT services.
Double NAT can also cause a slow down of web page loading. You may...or may not....notice this.

Time Capsule and Unexpected Double NAT problem

I have had a Time Capsule setup and working fine for about 2 weeks. The Time Capsule is the only router on my network and connects to a Motorola Surfboard Cable Modem which as far as I know has no router capabilities and serves up the IP address that it gets from Comcast.
All of a sudden this morning I get a "Double NAT" error message in my Airport Utility window. I cannot figure out any reason for this to happen, since the Motorola Surfboard doesn't act as a router at all.
What is going on? Is this a bug in the Airport Utility software or what?

I'm having this same issue. Resets, hard resets, and unplugging the ISP antenna did not resolve it. I was using an old AEBS G as my DHCP server, with the TC patched into it in bridge mode.
Today, I decided I wanted the TC to be the DHCP part of the network, and the AEBS G as the bridged AP, but it just won't work no matter what I do. The TC is now getting the WAN from my ISP's wireless antenna, which I'm pretty sure has no NAT capabilities. My ISP does block ports, though, and maybe that's what's confusing the TC.
Connectivity is all good, everything works, I just have this Double NAT error that I can't get rid of.
Any ideas?

Back to my mac over double NAT not working anymore

Hi,
I have a double NAT router setup and before Yosemite upgrade (up to 10.9), it was working fine (I had to setup DMZ to the Airport router on the ISP router to make it work). But now it doesn't work anymore. The iCloud config is telling: "Back to my Mac isn't working properly because the DNS server address....".
But I am pretty sure it have nothing to do with the DNS. Because names resolves without problems. And I tried with other DNS (like the Google dans 8.8.8.8).
I also tried deleting the keys in the keychain like another post suggested, but the problem persist.
Any clues?

Ok, just made it work on my setup.
Basically I went to the ISP router (the one that gets the public IP address from the ISP, and that then places my AirPortExtreme in its DMZ), and switched off completely its firewall (but kept the uPnP setting on, just in case).
I still get the warning message at the BackToMyMack settings pane, in OS X ("Setup Router for better performance" - in the details still refers to DNS setting problems, which I think is just misleading...), but apart from that, things seem to be working as expected (I can connect to my Macs from an outside network, and connect to my Airport Extreme using AirPort Utility, etc.).
I hope this helps.
Gustavo

I need Double NAT

My home Network is a T1 shared to the whole apartment building there for I need double NAT. That said, it worked fine before the 7.1 update. I don't think the AEBn even complained. After the update, it complained. I choose to ignore it but I'm still unable to get internet access unless I switch to Bridge mode.
All the basics have been addressed. DCHP is set to the 192 range, I've restarted everything, everything is fully updated, and so on. The WAN IP(in the 10 range) and DNS address don't expire after switching form Bridge to Share Public. Which is to say they work in Bridge but not in Share Public mode.
Any ideas? My thought is to roll back to the 7.0 firmware.

James, Ok, cool. Now were on the same page. Yeah, the AEn WAN is set to DHCP which it gets from the ISP's Cisco Router. I haven't changed any DNS settings. I tried switching the WAN to manual and then back to DCHP (release and renew) to see if that might help but it didn't. i even got the same IP back. Even so, that info is right. I don't bother with the Network Diagnostic application. (your referring to the help wizard that comes up when you can access the internet in Safari right?)
JUG, I'm not able to access the TI router, it's locked away from residents of the building, and if I could I don't think the other residents would like me steal the T1 for myself:) Also, I know some of these support threads are long and hard to follow (not this one), but if your going to try and help anyone it helps to have read the post as so we don't have to make posts unnecessarily longer talking in circles. You will note I did snip, right away, even at your first question:)
I have a open ticket with Apple regarding this issue. They are currently researching the issue and I hope to here back soon.
So, I added a USB drive to the AEn, set it up with Account level access (which is kinda cool) Each account gets their own private folder in addition to the Public one, and none of the data that was there previously is visible. Cool.
Anyway, after the AEn reset I now have a new error warning message. (running in Bridge mode still) It says the WAN port is in invalid and I may not be able to access the internet, I should check the dsl modem... or something to that effect. Of course it is valid, 10.0.1.26, as provided by the T1 Cisco router and I have internet access. Strange to just now be getting this error, even after being on call with Apple and not getting it.
I have a open ticket with Apple regarding this issue. They are currently researching the issue and I hope to here back soon.

Why do I lose internet connection when I put airport extreme into bridge mode to correct Double NAT issue

I reset my airport extreme router the other day because I was too lazy to reset the password on my private network.
I have been reading the advice found on apple support communities and wide web, but the solutions do not solve any problems and often create new ones.
I'm regretting because everything was working just fine.
But I remember having this double nat error when I first set it up a few months back, but now I cannot resolve it.
I would live with the yellow light, but it seems that this double nat error is preventing my playstation 3 from connecting to the airport extreme.
When I put the aiport extreme into bridge mode, I loose all my wireless networks, even when I reboot the airport extreme and the modem.
I try rebooting the modem, then the airport. and vice versa. No internet.
I switch back to NAT/DCHP and the internet works fine on apple devices, but not the playstation 3, and I have the 1 Double NAT error.
I have a plain stock Motorolla modem and I can dial in and see settings (although nothing about NAT). I didn't see where to see them.
I tried setting the DHCP only but it said it didn't like the settings. is there a stock range i could be using?

I have a plain stock Motorolla modem and I can dial in and see settings (although nothing about NAT). I didn't see where to see them.
Exact model .. motorola make adsl, cable and probably wireless modems.. with some modems and some modem router.. we need exact info. What kind of broadband do you have?
I would note.. some of the motorola cable modems seem to have issues with the apple routers. If you are about due to change modems.. now is a good time.. not another motorola.
If the modem is a straight cable modem, the AE must be in router mode.. but you need to power down the cable modem. maybe for 20min so the new router can pick up the IP address.
You cannot use DHCP alone.. the ISP do not give you a block of IP addresses.
You cannot use bridge with a pure modem.. you will find it works.. but only to one device.
The only reason you get double NAT is the failure to pick up the public IP.
Give the info required..
If you have trouble, I need the actual IP of the modem. the actual IP of the AE WAN port when plugged in. Screenshots are good.

How to set up DNS behind a NAT router...

I am trying to configure DNS in Panther Server as the SOA for my domains and as a LAN name server. I've read several explainations about setting up DNS including technical document 106853 "How to set up DNS in a NAT environment" which says:
Note: For Mac OS X Server 10.3 or later, you should use the Server Admin
application to configure DNS and NAT. Please see the Network Services
Administration Guide for additional information.
Seeing how picky BIND is, this sounds like a good idea, except I can't configure views like that.
Questions:
1) What happens if I create an A record in my main domain for newmac.mydomain.com-->10.0.1.2? People outside the LAN can't get to it, right?
2) Can I create really simple names for the LAN like newmac-->10.0.1.2?
Thanks!

You can use "system-config-network" command to configure your DNS configuration.

No DNS and Double NAT

Similar Messages

Maybe you are looking for