My motorola cable modem reset itself every 15 or 30 minutes

why does my motorola cable modem (sb6141) reset itself every 15 or 30 minutes everyday?

Start with the modem's signal stats. Perhaps they already are, or they are close to being out of spec and intermittently they go completely of spec. Try getting them here http://192.168.100.1
Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

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Can't connect to internet, Motorola cable modem seems to freeze

I have had this problem more and more fequently the past three or four weeks: I'm connected to the internet by ethernet through a motorola cable modem (SB5101). As long as the PC activity light on the modem is rapidly flashing amber things are fine. As soon as the activity light goes solid amber with no flashing I can no longer connect to the internet or send or receive mail. During one of these "freezes" when I check network status in the network pane of system preferences the light beside ethernet is yellow and the message says-"Built in ethernet is currently active. Built in ethernet has a self assigned IP address and may not be able to connect to the internet." When I check when my connection is working I get a green light and this message "Built in ethernet is currently active and has the IP address 70.44.etc. etc.(not sure if I should make the whole IP address public or not)You are connected to the internet through built in ethernet." I also notice when I check the Built in ethernet under network in sytem preferences that the IP address changes depending on whether the modem seems frozen or not. When disconnect the power to the modem and reconnect, I notice that within about two minutes the IP address changes and I can get back online again. Or at least I could. last time I did this the IP address did not change and I couldn't get back online. Now I'm using my iBook connected via ehternet, which is working fine for now (past 15 minutes). When I first plugged the iBook into the ethernet (I normally connect to the iBook through a snow airport, which I've disconnected to try to isolate this problem) I got this message(with an exclamation in a stop sign)-"IP configuration- 70.44.53.etc in use by 00:01:50:23:3e:c2 DHCP server24.229.54.226". I clicked through the box, and the iBook is still connected to the internet and working. I have contacted Motorola tech support, and it seems the modem is OK. I will contact my cable company next, but I don't have high hopes. Any help would be greatly appreciated.

sig-
Thanks for your reply to my post. I was able to get back on the internet with the G4 using your suggestion, but the modem continues to freeze, whether connected to the iBook or the G4, using ethernet or airport. I will contact my ISP.

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I am able to set up my new AEBS however I cannot connect to internet. I am told via Airport Utility that I have set up correctly and have the steady green light and the wireless connection however it just won't pick up the Internet. I've called my ISP Cox Communications and they told me it's an issue w/my router. I noticed a similar problem in discussion boards with Comcast and followed the same instructions and it did not resolve. I've tried to power off cable modem for 10 sec, 2 min and 10 min and just no luck. I immediately plug back in my Linksys router and am able to connect to internet just fine.
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Magand wrote:
I've tried to power off cable modem for 10 sec, 2 min and 10 min and just no luck. I immediately plug back in my Linksys router and am able to connect to internet just fine.
Anyone know what to do?
Power off your cable modem for at leat 10 HOURS! Cox like every other ISP "caches" the MAC address of your router. The only way to "reset" this and allow a new MAC address to be accepted, is to turn off the cable modem overnight for 8-10 hours.
Some routers have the ability to "clone" a previous router MAC address, therefore not requiring the above process, but the AEBSn does NOT have this capability.

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Hello
I've bought the new AEBS from an Apple Store in the U.S. Got back home in France thinking it's gonna be an easy ride setting up my new faster and longer range capable wireless network. After all that's what Apple says: "easy setup ... in most cases ". After ten hours trying different settings, no way to get an Internet connection !
The AEBS distributes IPs to the connected clients but cannot get an Internet address from the cable modem.
My configuration :
Motorola cable modem (SB4200E) : configured as DHCP server
Client computers:
iMac Core Duo connected to the AEBS via Ethernet
Macbook Pro Core 2 Duo wirelessly connected to AEBS
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AEBS:
Wireless Security : WPA2 Personal
Radio mode 802.11n only (5 Ghz)
Channel : Automatic
No Access control
I've tried to reboot, reset, ... the cable modem without success.
Oh forgot to say that my old 54g Netgear router is able to reach my MacPro in the bedroom where the AEBS is no show ! (Twice the range ???) and took me 30 seconds to configure.
Up until now AEBS has only been dissapointment and frustration.
Thanks for any help.

I ended up using my new AEBS in bridge mode and keep my "old" Netgear 54g for Internet connection.
Some pros though: I got a 10 MB/sec transfert rate between my wireless Macbook Pro and my wired iMac both connected to the AEBS.
Some cons: range is far from what I dreamt of (lesser range than the Netgear 54g at the same location in the room)
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SOLVED: Dropped connections with Time Capsule and cable modem/router

I've been dealing with random dropped connections for quite a while and I thought that it would be useful to share what I've found.
I was having a very puzzling problem where my internet connection would drop randomly on wireless devices. On my laptop, webpages would suddenly become unresponsive for a minute or two, Mail would have connection problems and complain, etc...but incredibly randomly and definitely not repeatable or in any pattern that I noticed.
I also have 2 Nest thermostats in the house which connect via wi-fi. I noticed that they would randomly show Offline very often when viewed from a webpage or iPhone app, but the Nest front panels showed that they were connected with a strong signal.
As I said, the dropped connections were very sporadic. Most of the time, everything worked, but every once in a while...bam.
I worked with the level 3 tech support guys at Nest for over a week to figure out what was going on. We went through settings on my router and Time Capsule and everything seemed proper and okay. I even replaced the Nests with new ones but still had the same problem. We were all completely stumped.
Yesterday, my laptop dropped it's connection at the same time my wife's laptop dropped hers. At this point, I wondered if something was wrong with the Time Capsule or maybe my internet provider.
I called AppleCare to see if they could help with debugging the problem. They passed me up to a senior wi-fi tech and he asked me many questions about the configuration of my network. My home network looked like this yesterday (see crappy diagram below)
                                                     Motorola Cable modem/router
                                                                             |
                                                       Netgear multiport switch
                                                      |          |         |         |          |
                                                     hardwired Macs,            TimeCapsule (bridge mode)
                                                     laser printers,                   |   |   |   |   |
                                                      Apple TVs                       laptops, Nest, iphones
This configuration seemed correct to me. The Time Capsule in bridge mode would mean that the cable modem/router would be handling DHCP so all the devices would be on the same network and I could print from a laptop to one of my printers and the laptops could connect to the hardwired Macs, etc..
The AppleCare technician said he thought that bridge mode was the problem. He mentioned that there was a known issue that in this configuration, the IP addresses could get lost between the cable modem/router and the Time Capsule. He said it would be best if the Time Capsule was in DHCP/NAT mode and the first device before the switch, this way the Time Capsule was the only device passing out IP addresses.
So I repatched my network like this:
                                                   Motorola Cable modem/router
                                                                             |
                                                   TimeCapsule (DHCP/NAT mode)
                                                            |                                       |   |   |   |   |
                                    Netgear multipart switch                      laptops, Nest, iphones
                                         |         |         |        |
                                           hardwired Macs,
                                             laser printers,
                                               Apple TVs
I can tell you that in the past 24 hours, I haven't seen anything lose a connection. Not even the Nests which seemed be on and off all the time. And, in this configuration, all the devices are on the same network and able to speak to each other.
I hope that helps someone.

So you're saying that Bridge Mode not functioning properly is a well known issue?
Not to me.. I have not had issues with the TC in bridge. And it is my prefered setup. I think it is better as a wireless AP and network hard disk than a router any day of the week.. but there are other ways to skin the cat if it is proving unreliable. I am at the moment using a wireless bridge from the Gen4 TC to a Gen4 AE upstairs for TV internet streaming.. it started off very reliable.. but of late I guess I need to reboot it every few days. And it has required a full reset two or three times.. although I probably need to take some of the blame for those. I am not over worried.. i do not believe in wireless bridges except for the most interim of arrangements.. it will be wired in ethernet ASAP.
Wireless should always be used in a way that respects its status as voodoo.. not stable technology. NOT SCIENCE.. it is more a bag of beads and rattles.
Is there a way to change the cable modem/router to avoid the double NAT problem?
The answer to this may depend on your ISP. Did they provide the modem? If so they may lock it down so you have no control. But normally a Motorola cable modem will not have a bridge mode as such but will have a method of turning off NAT.. (and wireless).. this amounts to the same thing.
Once you turn off NAT.. you need to power cycle the modem so the TC gets the public IP in router mode. The power cycle time might be 5min or 20min or overnight.. it again depends on your ISP.. but you need to stop the modem capturing the public IP so it can be passed to the modem.
Depending on where you are in the world.. US is most concentration of cable network.. you can go out and buy your own modem. Pick one on your ISP list and steer clear of SB.. at least with the apple routers they are problematic.
It also can be a case that the cable modem is SB model and therefore more problematic. Sorry I have forgotten the recommendation for what to buy. There are a number of posts here about it but search is terrible now. (or I am too old to figure it out). I will get Bob to poke his nose in and tell you what works for him.

Which cable modems work best with Time Capsule?

Which cable modems work best with Time Capsule? I have Time Warner in SoCal. I am replacing my old Motorola cable modem (constantly cuts out and needs to be reset) and I also bought a new Time Capsule. I will be using the Time Capsule for my wireless network and for back ups. Thanks.

These are the cable modems supported:
Vendor
Model
Motorola
SBG6580
Motorola
SB6141
Motorola
SB6121
Motorola
SB5101
Motorola
SB5101U
Motorola
SBG901
Netgear
CG3000D
Netgear
CMD31T
Zoom
5352
Zoom
5350
Zoom
5341J
ZyXEL
CDA-30360
If anyone has used one of these with Time Capsule, feedback is appreciated. Thanks.

My motorola cable modem reset itself every 15 or 30 minutes

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