Modem resetting when viewing web pages? - Page 2

Mooncat · 11-02-2006, 03:41

Ok I might have tracked down the problem, though it seems a bit odd...

My router is an old PC with linux and some router software.
The NIC's are pretty old and only 10mbit, and this appears to be the problem.
Even though I'm only on the 2MB service, it seems certain sites such as the one I mentioned previously overload the NIC's.
I don't know if its connected to the recent upgrades on the NTL network because the system had been working perfectly until this month.

To back this theory up I connected the modem direct to my main PC and forced the NIC ( this time an onboard 10/100 ) to be a 10mbit.
When I try to access gfxartist.com the modem reboots as before.
Change back to 100, and it all works perfectly again.

So it seems to be related to the NIC speed.
I wonder why this would affect me on 2mb though ?

Thanks.
Dan

**Paul** · 11-02-2006, 04:03

Quote:

Originally Posted by Mooncat

So it seems to be related to the NIC speed.
I wonder why this would affect me on 2mb though ?

Maybe the CM NIC has a fault when set to 10 mbps.

Andy38 · 14-02-2006, 15:54

I've just started getting the same problem, specifically trying to access http://www.bbc.co.uk/weather. I get a few seconds of nothing happening, then the status lights all go out and gradually come back one by one. Checking the model log file I see the same thing happening each time:

************7-InformationI510.0*** BOOTING *** SB4100-0.4.9.4-SCM02-NOSH 0602141124587-InformationH501.2HFC: Shutting Downstream Down 0602141124582-AlertT507.0Received Async Error Range Failed 0602141124583-CriticalR4.0Received Response to Broadcast Maintenance Request, but no Unicast Maint 0602141124583-CriticalH501.8HFC: T4 Timer Expired

I've tried connecting the cable modem directly to my PC's network card, rather than the router, and indeed the problem goes away.

The thing is, I haven't changed any of my hardware setup for ages, but I haven't seen this problem before about a week or two ago. According to NTL, and backed up by a speed test, I'm only on 2Mbit.

I'm using an SB4100 modem, and a Linksys BEFW11S4, which is a 4 port (10/100) wireless router and is probably 3 years old or so.

Does anyone have any idea what might be causing this? I've also seen a similar post on this forum from last November, but there didn't seem to be any follow-up or explanation.

Barryzig · 14-02-2006, 18:02

I get the same problem with http://www.bbc.co.uk/weather. A few seconds of nothing happening, then the cable modem re-boots. I have a Surfboard SB4100 modem and a Linksys BEFSR41 V2 router. Both have performed OK for years but a week or so ago this problem cropped up. If I bypass the router and connect directly via the modem there is no problem.

Web-Junkie · 15-02-2006, 00:18

I get the probelm and I DO NOT have a router!

I do have a Realtek RTL8029(AS) 10Mbps NIC card which has been in place well before the 2mb upgrade and, up until recently, has been working fine!

Too many people are having similar problems for it to be a 'PC side' fault!

StuS · 15-02-2006, 00:29

Quote:

Originally Posted by Web-Junkie

I get the probelm and I DO NOT have a router!

I do have a Realtek RTL8029(AS) 10Mbps NIC card which has been in place well before the 2mb upgrade and, up until recently, has been working fine!

Too many people are having similar problems for it to be a 'PC side' fault!

Since many people have already explained that they replaced their 10Mb NIC or 10Mb router and the problem went away, why not try a new NIC?

Mooncat · 15-02-2006, 00:38

Wow, it seems to be an SB4100 issue then.
I have an engineer coming tomorrow, so I hope he swaps the modem out.
Perhaps if enough of us report this same fault NTL will figure out what is causing it.

Cheers,
Dan

---------- Post added at 01:38 ---------- Previous post was at 01:33 ----------

Quote:

Originally Posted by StuS

Since many people have already explained that they replaced their 10Mb NIC or 10Mb router and the problem went away, why not try a new NIC?

Well I did buy a new router with 100Mb and although it fixes the problem with the websites, there are other problems that are not fixed such as the momentary disconnections.

But the point is that the 10Mb NICS have been working perfectly for years, why the sudden problem ?

Cheers

Dan

Web-Junkie · 15-02-2006, 17:09

Quote:

Originally Posted by Mooncat

But the point is that the 10Mb NICS have been working perfectly for years, why the sudden problem ?

My point exactly! Why should I have to change hardware when i KNOW the cause isn't because of my hardware, it's been working on 2mb since that service was available so that kind of suggests it's not my hardware!

If NTL have needed to change something fundemental to a service so that change is now affecting it, why aren't people being informed? Changing hardware everytime there's a problem isn't a solution

Andy38 · 18-02-2006, 08:38

So, after a bit of digging around I found that my router, a Linksys BEFW11S4 V2, only had a 10Mbit WAN port. Apparently some later versions had a 100Mbit port. I've now replaced it with a Linksys WRT54GS, and everything seems fine on the sites I was noticing a problem with, and to be fair I'd not noticed any other problems with drop outs.

Barryzig · 20-02-2006, 10:21

I also found that my old router, the Linkys BEFSR41 V2, had a max WAN speed of 10Mbps. I have now pensioned this off and I bought a PEAK CAS3047 wired router for ÃƒÆ’Ã†â€™ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€šÃ‚Â£24.50. THis has a 10/100Mbps WAN port. It worked straight out of the box and I can now access the BBC weather sites that would not work before.

Web-Junkie · 21-02-2006, 02:24

My downstream signal level has now hit +17 dBmv according to the modem diags, and surfing some sites is getting sloooowww.

Think a call is needed!

Bambi · 23-02-2006, 07:04

99% sure all these modem reboots are due to a 10Mb ethernet port.
Before I replaced my router I could reproduce this error on demand. The modem appeard to lose sync in its downstream signal with a 10mb port. Its strange that its happening with the slower lines also.

The signal sent to all modems is probably the same, and the modem just caps it off according to the config file it has stored. This is how you 'could' get 10Mb years ago thru NTL...

Chrysalis · 23-02-2006, 12:49

I must be in the 1% then, my modem is a 250 and unless I have bad eye sight it is negotiated at 100FD.

26-02-2006, 20:02

My modem has started to lose Sync & Rdy lights, not sure if it actually reboots itself, though. Once dropped off, it takes 15-20 minutes before reconnects to network

I had this problem in the past and the cause was local network issues. Engineer eventually came (having been via the 'read the script' support and told to "reinstal Windows" etc.), he swapped modem, but openly admitted there were major network issues, they knew about them, but to meet SLA they just swapped out modems knowing they wouldn't fix the problem

I notice my local my BT exchange (just down the road) is to have 8Mb ADSL next month, this may be the final push I need to leave NTL

maxwells_daemon · 08-03-2006, 00:25

Same problem for me. I saw it first on a Radio 4 listen again page, but also see it on other BBC sites like the BBC Weather page mentioned previously. The cable modem box crashes reliably on those pages, and is fine on other pages.

I can confirm that this only happens when I connect to the cable modem with a 10 Mbps NIC. It's fine with a 100 Mbps NIC (compared 10Mbps router and PC NIC in 10 and 100 Mbps mode).

I have an old SB4100i and 1 Mbps service.