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67 posts

Master Geek


  # 136233 7-Jun-2008 15:39
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I'm having similar problems with my Apple Time Capsule. I used to have a Linksys WRT54GL, and it worked with no problems.

I've been doing a bit of investigation, and this is what I have discovered so far:

1. There is a basic admin interface on the cable modem at http://192.168.100.1
2. No username or password is required
3. In the admin interface, there is a log panel. I get these errors:

1970-01-01 00:07:433-CriticalD001.0DHCP FAILED - Discover sent, no offer received
1970-01-01 00:00:163-CriticalT001.0SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:113-CriticalT002.0SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:00:113-CriticalT001.0SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:113-CriticalT002.0SYNC Timing Synchronization failure - Failed to acquire FEC framing
1970-01-01 00:00:103-CriticalT001.0SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
1970-01-01 00:00:056-NoticeM572.0Ds Lock Failed - Reinitialize MAC...
1970-01-01 00:00:036-NoticeM571.1Ethernet link up - ready to pass packets
4. These log messages tend to suggest that the cable modem is having signal errors.

The other interesting thing is that the cable modem has a configuration panel, and there is a DHCP server checkbox option. It give you this explaination:

The SURFboard cable modem can be used as a gateway to the Internet by a maximum of 32 users on a Local Area Network (LAN). When the Cable Modem is disconnected from the Internet, users on the LAN can be dynamically assigned IP Addresses by the Cable Modem DHCP Server. These addresses are assigned from an address pool which begins with 192.168.100.11 and ends with 192.168.100.42. Statically assigned IP addresses for other devices on the LAN should be chosen from outside of this range.

So, my current theory is:

1. All is working well, then...
2. The cable modem has a "random signal moment"
3. The cable modem detects that it is "disconnected from the Internet", and...
4. It enables the DHCP server option
5. My Apple Time Capsule doesn't like this
6. Somehow, the Time Capsule looses its known route path to the "default gateway", and is unable to recover

What is interesting - when my Time Capsule is in a "can't surf the internet state", I can still connect to the admin interface on the cable modem. I would suggest that this points to the fault being related to not being able to resolve a route to the default gateway.

So... I have unticked the DHCP server option to see if this helps to resolve the issue. The problem is that I'm only getting the "can't surf the Internet" state once every couple of days. So, diagnosis can take some time.

Further reading available here:

Google - http://www.google.co.nz/search?q=SYNC+Timing+Synchronization+failure+-+Failed+to+acquire+QAM%2FQPSK+symbol+timing

Apple Forums - http://discussions.apple.com/message.jspa?messageID=7319599

Cheers

Nigel
http://www.abletech.co.nz/

784 posts

Ultimate Geek
Inactive user


  # 140855 27-Jun-2008 10:28
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I too have been having frequent disconnections during peak hours. Whilst it is good for a couple of weeks it suddenly comes back and boots me out of WoW Vent and everything else for a few seconds. On a bad night it can happen every hour or even more frequent.

I am not complaining about the speed, just the ability for a continuous connection during peak hours.

The techician that was here 3 months ago agrees with the tecnician who has just left my house now..........it is caused by peak hour congestion. Both tecnicians say that TC will NOT own up to it.

As I am quite close to the Telecom exchange I am seriously considering switching to ADSL2 as telecom advise that eschange was completed 2 weeks ago.

 
 
 
 


2844 posts

Uber Geek

Trusted
Lifetime subscriber

  # 140884 27-Jun-2008 12:15
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If you are only getting dropouts in peak hours, perhaps it could be the ARP traffic overloading your router. and again sounding like a broken record, either directly plug the cable modem into your PC or use a Linksys WRT54GL loaded with DD-WRT.

I don't game, but can't remember the last time I had a dropout, do run skype a lot so would notice any dropouts.





784 posts

Ultimate Geek
Inactive user


  # 140947 27-Jun-2008 17:12
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BarTender: If you are only getting dropouts in peak hours, perhaps it could be the ARP traffic overloading your router. and again sounding like a broken record, either directly plug the cable modem into your PC or use a Linksys WRT54GL loaded with DD-WRT.

I don't game, but can't remember the last time I had a dropout, do run skype a lot so would notice any dropouts.


Modem is connected direct to the PC. As I said two TC technicians have both confirmed that dropouts are occuring on a lot of nodes due to congestion at peak times. I am currently investigating a switch to ADSL2 as i am close to a telecom exchange. I am frustrated after 8 months of dropouts at irregular intervals. I understand it is part and parcel of cable service issues globally. Most people want high speed, I just want a constant connection to game.

678 posts

Ultimate Geek


  # 150777 23-Jul-2008 21:41
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Well, even running the WRT54GL and DD-WRT is no guarantee.
Mine has started dropping out at peak time again.
Wonder if I should change the local IP range again and try a different range. 
Or do I just cross my fingers that Telstra will get this *fix* in place by the end of the month.




38 posts

Geek


  # 150782 23-Jul-2008 22:03
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Yes, also for the first time in many many months I've been getting some dropped connections since Sunday 20th July. I'm in central Lower Hutt. Not too bad tonight, but Sunday was bad. Bounced the cable modem to resolve it, but had to wait up to 10 minutes for a reconnect. Didn't need to touch the DD-WRT router though - it has been up for a few months now.



16 posts

Geek


  # 150823 24-Jul-2008 07:25
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Having similar problems. Live in Woburn. Modem will randomly drop.

 
 
 
 


678 posts

Ultimate Geek


  # 151071 24-Jul-2008 19:12
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Hmm, wonder if it's the Woburn node that having issues.
I'm in the Woburn/White Line East area also.

Peak time is not good at all.




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