Arris Cable Modem + Airport Express = double NAT = weird resolution

I have a cable modem (Arris TM402P/110), which (theoretically) is a modem only, to which I have connected Airport Express. I was getting a yellow light and a double NAT signal from Airport. And, my daughter's PC was getting bumped off the connection intermittently. When switching to "bridge" mode on Airport, the problem is resolved, and we are all accessing the Wi-Fi (iMac, 3 iphones, and 2 androids), and the light is now green on the router. How is this happening, if there's no router in my cable modem? Does this make sense to anyone?
Doesn't airport express "bridge" mean that the Airport Express router function is nullified?
Is there something connected to my system functioning as a router otherwise, and I don't know it?! Nothing else is plugged into the modem except the Airport!

If your client devices are all able to connect, it would appear the Arris TM402P/110 is in fact functioning as a router.
The documentation seems to imply as much, in that it states you can connect two or more computers directly to its LAN port:
To connect two or more computers to the Ethernet port, you will need a hub or broadband router
If it were strictly a modem, connecting a hub to it would not work.
Wittymermaid wrote:
Doesn't airport express "bridge" mean that the Airport Express router function is nullified?
Yes. The documentation does not describe how to disable the Arris's router.
This is an old modem. While searching for your answer I determined that it does not support IPv6, which could be a problem in the future.

Similar Messages

PC - Cable Modem - AirPort Express

Please excuse my ignorance, I’m new to apple. At home I have a PC with a cable modem. I know that I can connect the Ethernet to Airport Express but will I still be able to have to have access to the internet via my PC (my PC is not wireless capable)??
Thanks

Simple answer - no.
If your cable modem is connected to the Airport Express ethernet port, all your computers must have wireless interface adapters in order to access the shared internet connection.
A few alternative solutions:
- forget about the Airport Express. Buy a wireless router at your local computer shop (costs under $50) and use it to share your cable internet connection. All wireless routers provide ethernet ports to allow sharing with non-wireless computers.
- buy a wireless network adapter for your PC. These are dirt cheap these days - $20 to $50.
- (expensive) buy an Apple Airport Extreme Base Station. Unlike the Airport Express, it provides an ethernet LAN port for sharing with non-wireless computers.

AirPort Extreme/Router/Arris Cable Modem

I have Cable internet, and I'm using an Arris Cable Modem. I got a router a while back, and it was working great between my PC and PowerBookG4, when one day it stopped working. I eventually through the router out. Yesterday, I tried connecting the Arris Cable Modem wire to my AirPort Extreme. I turned on my Powerbook, and in the little AirPort icon I had 4 bars, so I assumed I had a connection. I opened up Safari, but I couldn't get anything. I tried restarting, reconnecting, and anything else I figured would effect the connection. The lights on the AirPort express, when I connect the wire, are...1st one is blinking, but slowly, 2nd is steady, 3rd blinks. I'm wondering if theres something preventing me from using the Cable Modem w/ Airport Express.
- Thanks in advance.

Connect the cable modem to the Airport Base Station's WAN port (that's the port labelled with the "circle of dots" icon). Then pull both the modem and the Airport Base Station from power for at least five minutes. Then plug the modem into power and wait a minute. Then plug the Base Station into power and wait a minute. Then try internet access via the Base Station again.
That's my only bit of advice. No other suggestions if that fails to work.

Why has my native windows 7 Pro-64 network to a windows 7 Pro-64 VM has slowed to a crawl and freezes, after the new Arris cable modem was installed?

Please appreciate the details, so the complete situation can be visualized:
The office network:
New Mac Mini PC running Win 7Pro 64, (in boot camp), networked to an iMac running the same Win 7 Pro 64, VM, UNDER Fusion 7Pro.
To review: My treatment rooms former dell PC/running vista business/ running the server and network versions of my Dental practice mgmt & X-ray capture apps, had no probs WLAN to the front desk iMac running the same PC client dental network apps under the same vista business, & Fusion 4. The dell slowly fried its power supply .
I could not wait to replace it with a Mac mini/ boot camp/ win7 pro 64 bit, as it has to run natively to capture X-rays. The front desk iMac was also upgraded to os10.10.3/ Fusion 7pro/ and its own matching Win7 pro 64bit. The iMac is wired and WLAN connected to a netgear d600 router and a Time Warner Cable modem. The modem then failed and was replaced by an arris modem. As the Arris was configured out of the box, the network ran much slower slowed, as compared to the original modem. BUT- The Vonage 2 line phone system stopped working- no incoming or outgoing voices could be heard after it rang. Then twc remote configured it and the phone now works, but the network iMac slowed to a crawl, and now freezes when accessing the Mac Mini PC dental server to edit or enter data. The Mini perfectly accesses the internet via wifi. It accesses the front desk canon printer by wifi, and can print share they the iMac that is wired to the printer, as well, BUT, the network connection is a spinning pinwheel. The front desk imac easily finds the Mac Mini PC server on the network. It connects easily by entering the servers IPv4 address SHOULD THAT last value change. But if data isn't entered in slow motion, the window and app freezes, and has to be force quit by Task Manager!
Cause:
1. I think TWC switched the cable modem from the default- Non Bridged, to Bridged mode. Could this be the cause?
2. The network setting in fusion, on the iMac is auto detect, a setting that always worked with vista and with the new Win7 system, before TWC installed the new arris modem. 3. Switching to NAT does not work at all is there a different setting to use?
3. Does the Netgear Router have to have a port or pref configured so as not to block the Server.
4. might in need an Access Point (I have an extra netgear wdr3400) ).
5. Do I need an Extender that plugs into the AC LINE?
I hope this info helps.
PS:(some addtl info:
1. File sharing works fine between the minis -Mac and boot camp sides and between the iMacs- Mac and VM sides and between eother side to or from either of the 2 computers! 2. Also either office computer and all of my my home macs , (& my iPad, & iPhone), can access each other instantly and flawlessly, with splash top streamer and jump desktop remote apps, as controller or as client! In fact, the front desk iMac can remote control the mini PC AS IF YOU WERE DIRECTLY ENTERING INFO I TO IT!
SO I think it's either a misconfiguration in the TWC cable modem &/or some additional pref to config in the router? Thanks so much for your help, (been using VM's since VPC1. & Win95 in a iMac, 1999, DV MODEL! (TWC BLAMES VONAGE FOR NOT OPENING SOME PORTS IN THE TELE MODEM. Vonage blames TWC FOR NOTopeningj ITS PORTS IN THE CABLE MODEM, when they meant the ports on the Netgear. They have passed the buck for 6 weeks with not even a guess at what to do. VERY FRUSTRATING! Again, thanks to all!

Okay Saint Steven, I'll bite:
I read your description multiple times, very carefully, and I am still confused. May I suggest the following:
* Follow basic troubleshooting procedures. Isolate each individual problem. Don't try to get everything working at once. Make one change at a time.
* If I read your description correctly, the Netgear D600 (??) Router is the office LAN (not WLAN). Connect each piece on the LAN separately one-by-one, and test each piece individually. Get your LAN and its devices working first. Forget about the Vonage and the Arris Cable modem.
* Next, look at your Internet connection. Again, try each piece separately. Depending on how the original cable modem and the new Arris cable modem are configured, you may also have to adjust the configuration of the Netgear D600 Router.
* Finally, if you are still having problems, try to organize your thoughts and presentation before you post again. List each element in your network. List how each element is configured. Be systematic.
"Arris cable modem" does not help much - some are simple bridges, others are routers, etc.
To answer your questions:
1. I can't tell from your confusing description, but I don't think so. It seems like the problems are associated with the system changes you made (replacing Dell, etc.) and the problems seem to be isolated to the local LAN.
2. Auto detect should work, but it is easy to change and test, as long as you change one thing at a time.
3. No. The Netgear router should allow all communications on the local LAN. Could you have put the "server" in the DMZ?
Note: I could not find a Netgear "D600" model in a web search. Do you mean N600?
4. No. I doubt that you need an additional access point. Based on your description, everything appears to connect to the LAN.
5. No. See 4.
To repeat myself:
* Do careful, systematic troubleshooting.
* Provide carefully written, detailed description of your network and system configurations when you ask for help.
Good luck!

Configuring WRT54G with Arris Cable Modem (Comcast)

Recently got Comcast high speed internet. They gave me an Arris Telephony Touchstone modem # TM502G. I don't have any problem with the wireless aspects of the WRT54G, however I cannot get the router to make an internet connection with the modem. I have cloned the MAC address and I have changed the local IP address to 192.168.2.1. None of these actions have caused the modem and router to communicate. I would appreciate any help to quickly rectify this problem.

I have a Arris Cable Modem.. model #TM502G. I am having a problem connecting to the Linksys WRT54G...
Can you give me step-step instructions ? I simply can not log on.
thanks,
boabica

Need expert cable modem airport extreme advice

I have been on hold with Comcast for an hour and so far no end in site. So I thought maybe someone here might be able to help me.
Because of Comcast's recent decision to cap bandwidth to 250GB a month I moved up to their Business Class high speed internet service that have NO bandwidth cap. I also get 16MB Down and 2MB Up for just $20 a month more, but the no limit on bandwidth sold me.
Anyway, they installed the new modem today while I was away, and when I returned home I saw that my Airport Utility was reporting a "Double NAT" error. Airport recommended changing the unit to "Bridge mode" (I also have two other base stations in the house), which corrected the Amber light, Double NAT error, but while I can connect to the net I am getting slower speeds.
Speakeasy.net is showing me that IF I use Bridge Mode I will average 8-10MB Down, and 1-1.5MB Up, but if I allow the Double NAT error by using "sharing a single IP" address I get an average of 15-20MB Down and 2-2.5MB Up.
Bridge Mode doesn't affect the other two units on my network, and while 8-10MB Down is still quite fast, the 15-20MB is a quite a bit faster.
So my question is this: Does the Business Class modem serve its own DHCP/NAT and if I set my Airport to "Share a single IP" it is redundant? Are both the cable modem and the Airport attempting to use DHCP/NAT and that is what causes the error? Lastly, is there a real reason for using Bridge Mode instead of "share a single IP", with respect to security, stability, or anything else? Does it really matter which one I use as long as I am able to use the net on my computers?
Thanks in advance for any insight you can provide. And yes, I am STILL on hold

http://www.mac-pro.com/Airport-Extreme-Base-Station-Power-Adapter
Just one of many if you enter AirPort Extreme Power Adapter in a Google search.

Can't find how to set up wires modem, Airport Express, imac

My imac gets its internet using ethernet cable from cable modem (only one ethernet port out of it) to imac. Just bought airport express to send wireless signal to my house so kids can use wireless pc laptop. But want to keep my imac hard wired to internet. What cables do I need to plug in where?

If your new AirPort Express is a 2nd generation model, then you would just need another Ethernet cable and connect it between the base station's LAN (opposing arrows) port and your iMac.

Airport Express PS3 Nat type 3 problem

Recently I bought a Playstation 3. I have succesfully created a connection using the airport express connected to my speedtouch modem. The problem is that when I do an internet connection test on my PS3, it says that UPnP is unavailable and NAT type is 3. This is a major problem because I can't join chats or games, how can I get NAT type 2? It would be greatly appreciated, Thanks in advance...
Message was edited by: EDuranMac

I've done that already, foward the ports I mean. Right now I have my PS3 under DMZ and I'm still getting NAT type 3. Since it wouldn't hurt to try this again (forwarding the ports) I will, meanwhile I have a question: do I need to disable UPnP on both the router and the PS3 or leave enabled? Also, does it hurt to enter the PS3's ip address in the DCHP reservation or do I need to leave it outside?
Message Edited by Alakratt on 06-22-2008 08:26 PM

Connecting iMac to Network via Ethernet Cable and Airport Express

I've tried reading through the various posts to solve this and haven't had any luck. Any help is deeply appreciated.
I have an Airport Extreme as my main 'base' for our wireless network. I purchased an Airport Express today with the notion of using it to extend my network in the following way: I want to connect an iMac and a printer to the Express (using Ethernet and USB cables respectively) and have the Express serve as a remote for the Extreme base. I have found a number of websites saying this is possible, but none explain how to. I tried the WDS option, which failed to work. I later saw posts here saying that was not the optimal scenario. I'm afraid the 5Ghz/2.4Ghz settings combined with Airport ID addresses has pushed me past my competency!
Thanks in advance for your help and a festive St. Patrick's Day!

Temporarily, power down the AirPort Express and concentrate on the AirPort Extreme to make sure that it is functioning correctly, can get an Internet connection, etc.
A complete power cycle of the network is often useful when you have been making changes. Power everything off, order is not important.
Wait a moment, (or wait 5-10 minutes if you have cable modem), then power up the modem first and let it run a moment by itself. Then power up the AirPort Extreme the same way.
Check your settings using AirPort Utility - Manual Setup
Click the Wireless tab just below the row of icons
If the Wireless Mode setting is "Create a wireless network", make sure there is a check mark next to "Allow this network to be extended"
Note the exact setting for Security that is being used
Update to save any changes
Post back when the AirPort Extreme is functioning correctly as above and we'll tackle the AirPort Express

Charter cable internet + Airport Express = frequently offline

Hi -
I've had trouble keeping multiple computers online wirelessly at the same time. Seems that initially the Charter cable worked flawlessly (10+ Mbps down, 1+ up), but when I added a Linksys router to it, only one of our Mac laptops seemed to be able to connect at a time, and even that was spotty.
Just bought an Airport Express, hoping that eliminating the other router would be an easy fix. The MBP that I set it up with seems to be the happiest with it - being online most of the time. But when we add another computer to the network, we start to have issues - stall outs, BBoD, offline, etc - where generally the answer is repeatedly turning off and back on the airport on each computer until we notice that we're back online.
Has anyone else experienced this, and if so, what did you do to fix it? Thanks in advance - and I'll post any solutions that work in case they'll help someone else in the future...

I just got charter cable and experiencing problems also! Connected direct to the cable modem it's fast at 10mbps down and 1mbps up. I then connected a DLink 624 wireless router that I had been using at my old place and the signal range is very weak, even right next to the router. This was very strange as I had been using this router with Comcast and SBC DSL with excellent results before. So I then hooked up my airport express and it works but my speeds went to 2.5mbps down and .1mbps up. this is horrible. And in addition my airport express will stop connecting to the internet sometimes even when it's green and the modem is lit up green. Rebooting multiple times does nothing. Now 3 hours later it's working again. Called charter but they say it's my router's problem. I'm about to try my 3rd router, but I think this has something to do with Charter. Is anyone else having problems with Charter?

Roadrunner Cable Modem + Airport Extreme = limited internet :(

I am having trouble gaining full internet access with my Time Warner (Roadrunner) cable modem. They use DHCP to configure TCP/IP, and I need a publicly visible static ip. I have tried many different things to get this to work, but so far nothing. Anyone know how (or if) I can get this to work?
Would be very helpful to know what Roadrunner SoCal limits with their residential service. I cannot find this on their website, and the rep I spoke with said they block nothing. I'm not sure if this is true.

cshamis wrote:
Please, pardon if this is remedial networking for some of you:
It was really helpful, thanks!
The problem is that the airport extreme is "in front of" your computer. So that when Internet services (like BitTorrent) try to connect to your machine (which is expecting them), they hit the Airport first, (which is NOT expecting them)... since it doesn't know what to do with them, it throws them away.
So I know you go on to explain how to let this traffic through, but should I place the airport in front of the modem (I dont even know if this is possible)
The reason why things like WWW work, is because the Airport isn't completely brain-dead. It knows how to "follow a conversation" and it essentially eaves-drops to all outgoing connections from your computer. If your computer deliberately asks for a response, then the Airport extreme "knows enough" to send the expected response back down to your computer. This magic all happens automatically for things like your email, web, ftp, etc.etc... because these services all follow a "back-and-forth" communication model.
The problem with protocols like BitTorrent (or running your OWN webserver for example) means that, you never know who is going to come knocking. It's not that the Airport is denying these "visitors" so much as, it wasn't told that anyone was coming.
To fix the problem you need to tell the Aiport extreme to roll out the welcome mat, and also... you need to the the Airport *where to send these visitors* That is what you do with the NAT port maps. This is how you tell the airport, when somebody comes and knocks on this door, send them to my PC. (Not, my laptop, or my iPhone, or my printer, or anything else that may be on the network: send them to my PC) After all, it is the PC that would be running BitTorrent, or Unreal, or a webserver, or ICQ, or what-have-you...
So now all you have to do is find out the IP of the machine you want to send the traffic to, and then you need to find out what PORTS that traffic arrives on.
For example... if you wanted to run a webserver on your home machine at internal ip: 10.10.10.2; then you would tell the Airport to route all incoming traffic on port 80 (the HTTP port) to internal address 10.10.10.2 (your PC). And that's it.
It has been my experience that BitTorrent uses the following ports:
tcp 13405
udp 13405
tcp 6881-6999
udp 6881-6999
TCP and UDP are two different flavors of internet traffic, and there is a section in the NAT redirections that allow for each... make sure you place them in the proper places.
Hope that helps. If it doesn't, let me know and I'll email you a screenshot of what the config page should look like.
I had already set things up this way ... and it does work, sort of. But I find that in some cases a mere 25% of my attempts to communicate out/back succeed. So I would love to take you up on the offer to send screenshots. Thank you so much for all the help!

Roadrunner, motorola sb5100 cable modem & airport..how do I get it to work?

Trying to get my snow Airport to play nice with my TW Roadrunner cable internet service. I can plug directly into the ethernet cable from the cable modem and get online easily..but it doesn't seem to work when I hook up the snoe basetation.
My Powerbook sees the wireless and the basestation is plugged in the cable modem. I cycled the modem and basestation off(and the Powerbook) and then restarted them....no dice. The outer two lights on the base station stay almost constant blinking when the airport is connected...as is the online light on the Motorola surfboard modem.
Ultimate goal is to get a wireless network for both Mac's & PC's in the house using the Airport as a router...

Make sure you are connecting the ethernet cables to
the correct ports on the base station. From the modem
connect to the WAN port. From the Mac connect to the
LAN port. With everything off, turn on the modem,
wait 30 seconds, turn on the base station, wait 30
seconds, then boot the Mac.
Well more detail....I managed to get it to work..sort of....
I had to turn off the NAT addressing in the Airport(Snow) configuration. However doing that means I cannot share the internet connection as best as I can figure correct?
I have also discovered the cable modem interferes with my ability to configure the base station(or modify the configuration).
As for the LAN & WAN ports..as I understood it the WAN port is the Ethernet symbol on the snow base station and the LAN is the circular symbol..correct?

Digital or analogue cable from Airport Express?

Getting my hi-fi tomorrow and trying to find a toslink cable with 3.5 mm /minijack in both ends to connect with my Airport Express. They are quite hard to find and I wonder if the sound quality really gets THAT much better with the digital cable?

Thanks for the input, but I'm not clear on this toslink adapter and I hope you can clarify.
I assume the adapter is connected to the line out of a dock station, since an iPod only has headphone out. Does that mean that the dock station line out is outputing digital or analogue? If it is outputing analogue, the signal has gone through the iPod DAC which has already converted the digital to analogue. (Which I guess that's a dumb observation since it must be outputing digital unless the adapter has an ADC).
If the dock station input is better then the headphone then I assume the dock station is streaming a digital output which is being converted to analogue by the HiFi's DAC.
So the conclusion must be that the line out and the dock station outputs are both streaming digital, bypassing the iPod DAC, but, for some reason the line out is not getting as much distortion in it's route to the output as the dock station output is.
Thanks for any help
Thanks

Airport Express WDS main weirdness

I have some Qwest provided dsl modem/wireless router hooked up via ethernet to an airport express 802.11n configured to be WDS main. There is another airport express 802.11n as a WDS remote upstairs. If I connect directly to the qwest router I get good performance, if I connect to the WDS remote I get good performance. If I connect to the WDS main, I get terrible performance. I've tried unplugging, turning off ipv6 and lots of other suggestions I've seen, but nothing seems to help. I've seen the same thing with my imac and my macbook air, so I think the problem must be the airport express.

Welcome to the discussions!
If both of your Expresses are 802.11n capable, you can use the "extend a wireless network" option rather than WDS.
WDS cuts the bandwidth of your wireless network in half when you add a remote device. "Extend a wireless network" will not do this.
Can you confirm that both Expresses are "n" devices? Do you need step by step to set up the "extend" feature? It's much easier to setup than WDS and will perform much better.
Of course, it is possible that you have a defective Express there. If you have time, you could switch devices, or test each one individually as a base station to verify proper operation.

AnyConnect. ( version 3.1.02026 ) and Arris cable modem connection problem

I had a new Arris high speed Cablevision cable modem installed. I can connect to the internet but cannot now get to the Oracle Network using Cisco AnyConnect Secure Mobility Client and myaccess.oraclevpn.com.
Cisco connects OK and I put in my VPN password in, hit OK but then get message ‘Failed to get configuration from secure gateway.Contact you system administrator’ Then error Anyconnect was not able to establish a connection to the specified secure gateway.

I had a new Arris high speed Cablevision cable modem installed. I can connect to the internet but cannot now get to the Oracle Network using Cisco AnyConnect Secure Mobility Client and myaccess.oraclevpn.com.
Cisco connects OK and I put in my VPN password in, hit OK but then get message ‘Failed to get configuration from secure gateway.Contact you system administrator’ Then error Anyconnect was not able to establish a connection to the specified secure gateway.

Arris Cable Modem + Airport Express = double NAT = weird resolution

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