Telecommunications Talk Telecommunications Talk    FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Virgin Media Internet circuits switching every hour Goto page Previous  1, 2          Telecommunications Talk Forum Index -> Broadband View previous topic :: View next topic   Author Message Vipera berus Guest Posted: Mon Jul 14, 2008 2:51 am    Post subject: Re: Virgin Media Internet circuits switching every hour Steve Rumsby wrote: Quote: At the moment i can't send email via virgin adsl. Error is as below. An unknown error has occurred. End-of-data rejected: ip has temporarily exceeded the allowed mail recipient relays per day', Port: 25, Secure(SSL): No, Server Error: 451, Error Number: 0x800CCC6A Can recieve but not send.... Same here. Started last night and is still happening this morning. So it isn't just you... Steve. Just happened again, send but no receive... First time something as basic as email has stuffed up. But not fixing it once and for all is unforgivable. Simple, old, basic, low bandwidth tech. Not exactly fat pipe VR is it... Mutter mutter... bloody smug face Branson selling us out to NTL idiots who couldn't get a nybble sent down the garden with some string and two cans without cocking up! It's 2008 FFS! Back to top   Ads Advertising Sponsor PhilT Guest Posted: Mon Jul 14, 2008 9:01 am    Post subject: Re: Virgin Media Internet circuits switching every hour On 12 Jul, 12:16, Mark McIntyre <markmcint...@TROUSERSspamcop.net> wrote: Quote: They don't do any of this. The most likely problem the OP is facing is either poor S/N levels on his line, or a dodgy modem power supply. Both can cause the modem to lose sync. Thanks for this pointer. What are acceptable S/N levels? I currently have ... Downstream SNR=38db PowerLevel=4 dBm V (4 seams low to me) Upstream Channel ID = 2, Power Level = 48 dBm V I have tried changing channel without any improvement. Just to clarify the symptoms during the 'failure' ... Any application with a socket connect (i.e. FTP) will freeze for a couple of seconds, and then continue but the connection is broken and has to be re-established. A continous PING to a remote address will fail for 2 or 3 seconds and then recover. The Modem is a SURFboard SB4200 - I've had it a few years now. Software Version: SB4200-0.4.9.6-SCM02-NOSH Hardware Version: 1 MIB Version: II GUI Version: 1.0 VxWorks Version: 5.3 The logs show a regular failure to update firmware whenever it is restarted. Back to top   Ads Advertising Sponsor Graham J Guest Posted: Mon Jul 14, 2008 11:06 am    Post subject: Re: Virgin Media Internet circuits switching every hour [snip] Quote: If you changed to a technically competent ISP you would stand some chance of a sympathetic hearing here ... The names Andrews & Arnold, Idnet, and Zen frequently appear on this ng as being associated with technical competence. -- Graham J Back to top   Ads Advertising Sponsor Alex Fraser Guest Posted: Tue Jul 15, 2008 1:51 am    Post subject: Re: Virgin Media Internet circuits switching every hour PhilT wrote: Quote: On 12 Jul, 12:16, Mark McIntyre <markmcint...@TROUSERSspamcop.net wrote: They don't do any of this. The most likely problem the OP is facing is either poor S/N levels on his line, or a dodgy modem power supply. Both can cause the modem to lose sync. Thanks for this pointer. ....which I suspect actually completely missed the fact that you are on cable, but oh well. Quote: What are acceptable S/N levels? I currently have ... Downstream SNR=38db PowerLevel=4 dBm V (4 seams low to me) Unfortunately, while ADSL modems report SNR *margin* (ie actual SNR minus minimum required SNR), cable modems do not. So a 38dB SNR is not meaningful in itself; it depends on the modulation. 4dBmV is actually a fairly high power - certainly more in danger of overloading the amplifier than resulting in poor SNR. Quote: Upstream Channel ID = 2, Power Level = 48 dBm V This is quite high, particularly given the received power level, but may mean that you are near one of the amplifiers (which amplify the downstream but not the upstream). Quote: I have tried changing channel without any improvement. That's usually a bad idea. Quote: Just to clarify the symptoms during the 'failure' ... Any application with a socket connect (i.e. FTP) will freeze for a couple of seconds, and then continue but the connection is broken and has to be re-established. A continous PING to a remote address will fail for 2 or 3 seconds and then recover. That doesn't sound like losing sync - far too short. More importantly, TCP connections will not break from a few seconds of lost connectivity, with one exception: Windows (NT5+) resets all TCP connections if the interface reports that it is disconnected (eg network cable unplugged). This is visible to application code as a connection aborted (send()) or reset (recv()) error. Aside from the issue above, the only way this can happen quickly (ie the connection is broken within seconds of the last data received) is if a RST is received. Quote: The Modem is a SURFboard SB4200 - I've had it a few years now. [snip] The logs show a regular failure to update firmware whenever it is restarted. But presumably nothing that coincides with the short "loss of connection" events. Bottom line: it seems extremely unlikely to be down to a signal problem. Alex Back to top   Ads Advertising Sponsor PhilT Guest Posted: Tue Jul 15, 2008 6:03 am    Post subject: Re: Virgin Media Internet circuits switching every hour On 14 Jul, 21:51, Alex Fraser <m...@privacy.net> wrote: Quote: But presumably nothing that coincides with the short "loss of connection" events. Bottom line: it seems extremely unlikely to be down to a signal problem. Alex Thanks Alex. I've done some more digging ... To save time writing an app to monitor the line, I found TCPSpy (http://www.sharewareconnection.com/tcp-spy.htm) I ran it on both ends of the link and then ran NetSupport. Right on schedule, the line dropped and both ends reported "WSAECONNRESET" - which suggests the other end closed the session. To confirm the timing of the break, I waited 30mins and completely removed the power to the modem, waited a minute and then powered it back up. The next break was exactly an hour after the previous break. This suggested that it's not the modem but either the network or my PC. Then I powered off the PC and then back on - this time the line stayed open for almost an hour. Therefore, I beleive the fault is with my PC. In the past when the break occured almost on the hour, I must have rebooted on the hour and not realised the significance. So, I'm now looking at what has changed on my PC since 24th May - other than a couple of Windows updates I cant find anything yet. No network driver updates, no power management changes. I cant try connecting directly to the modem via USB because the PC and Modem are at opposite ends of the house and USB won't go that far. Back to top   Ads Advertising Sponsor Guest Posted: Tue Jul 15, 2008 4:29 pm    Post subject: Re: Virgin Media Internet circuits switching every hour Quote: So, I'm now looking at what has changed on my PC since 24th May - other than a couple of Windows updates I cant find anything yet. No network driver updates, no power management changes. If you think that it might be the dialog between your PC and router, then Ethereal, regularly on UK computer magazine DVD's is a good tool, it is also a free download. Expect a bit of a learning curve as you learn the various types of packets and their payloads. You learn about echo requests, who has requests, IP address requests, GRE encapsulation if you use VPN. If you are paranoid it shows what your IP can log about your activities. You can see your IP address leases with it. USB can be extended with USB over CAT5 adapters, around a tenner on eBay, or rather more for the Lindy branded ones. There are also USB over wireless adapters, but that sounds a bit dodgy to me. Back to top   Ads Advertising Sponsor Alex Fraser Guest Posted: Tue Jul 15, 2008 10:59 pm    Post subject: Re: Virgin Media Internet circuits switching every hour PhilT wrote: Quote: I've done some more digging ... To save time writing an app to monitor the line, I found TCPSpy (http://www.sharewareconnection.com/tcp-spy.htm) I ran it on both ends of the link and then ran NetSupport. Right on schedule, the line dropped and both ends reported "WSAECONNRESET" - which suggests the other end closed the session. Perhaps one end received (or acted as though it had received) a RST, so the next packet from the other end caused a RST to be sent in response. (I'm not sure of the exact responses in this situation so I could be wrong.) Next step is to establish whether another computer on the LAN exhibits the same problem. After that, or if that's not possible, winpcap + Ethereal to capture/analyse the traffic at the time. [snip] Quote: So, I'm now looking at what has changed on my PC since 24th May - other than a couple of Windows updates I cant find anything yet. No network driver updates, no power management changes. I cant try connecting directly to the modem via USB because the PC and Modem are at opposite ends of the house and USB won't go that far. I believe the USB connection is basically a USB Ethernet adapter built into the modem, which means using that is just using a different Ethernet adapter. The modem is a bridge and doesn't involve itself much in higher-layer traffic anyway, so I doubt this would be useful anyway. Alex Back to top   Ads Advertising Sponsor PhilT Guest Posted: Wed Jul 16, 2008 10:16 am    Post subject: Re: Virgin Media Internet circuits switching every hour On 15 Jul, 18:59, Alex Fraser <m...@privacy.net> wrote: Quote: Next step is to establish whether another computer on the LAN exhibits the same problem. After that, or if that's not possible, winpcap + Ethereal to capture/analyse the traffic at the time. Alex I dont have a second PC I can try on the network at the moment. I do have a very old laptop I can try to get going and give that a try. I looked for Ethereal and the links sent me to WireShark - it's looks very much like an updated version of Netmon (Microsoft) I used on NT4 Servers many years ago - and still use on Win2003 Servver - but with colour. I captured a few crash points but there is so much data it's difficult to pick through it. One item I have noticed (which I am now filtering for) is IGMP packets. At the time of the last failure, I got an IGMP packet from my PC with SRC address=0.0.0.0 and DEST address=224.0.0.22 - this was marked as 'V3 Membership Report/Leav Group 239.255.255.250' There are other IGMP packets going around. Back to top   Ads Advertising Sponsor PhilT Guest Posted: Wed Jul 16, 2008 10:49 am    Post subject: Re: Virgin Media Internet circuits switching every hour It went again - one hour later (actually 10 seconds short of the hour) with the same IGMP packet. It was followed 30 seconds later by a handful of other IGMP packets but the link had already broken by this stage. When I originally upgraded my router firmware, I was informed that the fix was for a problem with DHCP multicasts on the Virgin Media network. The patch stopped the modem (Dynamode BR6004W-G1) sending out these multicasts. Quote from an email from Dynamode support ... "When the router is connected to your ISPs servers, the router needs to obtain an EXTERNAL IP Address. With some routers, a bug can develop where the router repeatedly requests an EXTERNAL IP Address. If this happens, then your ISP will suspend the account until the problem has been rectified, since the multiple requests slow down their Servers, affecting other users on their Network." I wonder if my IGMP multicast from address 0.0.0.0 is somehow causing a similar issue with VirginMedia ... or is this a standard message? Back to top   Ads Advertising Sponsor PhilT Guest Posted: Wed Jul 16, 2008 12:11 pm    Post subject: Re: Virgin Media Internet circuits switching every hour Quote: I wonder if my IGMP multicast from address 0.0.0.0 is somehow causing a similar issue with VirginMedia ... or is this a standard message? ok, wrong this time. I disabled IGMP on my PC, saw no packets and it still failed after one hour ! (IGMPLevel set to zero - http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/regentry/58766.mspx?mfr=true) So, I'm back to square one and need to monitor all traffic again (or get the laptop working). 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